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Direct measurement of the break-out ^(19)F(p,γ)^(20)Ne reaction in the China Jinping underground laboratory(CJPL)
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作者 Yin‑Ji Chen Hao Zhang +28 位作者 Li‑Yong Zhang Jian‑Jun He Richard James deBoer Michael Wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue Li Jian‑Guo Wang Long Zhang Fu‑Qiang Cao Zhi‑Cheng Zhang Xin‑Zhi Jiang Luo‑Huan Wang Zi‑Ming Li Lu‑Yang Song Liang‑Ting Sun Qi Wu Jia‑Qing Li Bao‑Qun Cui Li‑Hua Chen Rui‑Gang Ma Er‑Tao Li Gang Lian Yao‑De Sheng Zhi‑Hong Li Bing Guo Wei‑Ping Liu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第8期142-152,共11页
Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in astrophysics.As one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle w... Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in astrophysics.As one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest stars.However,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(19)F(p,γ)^(20) Ne reaction with respect to the competing ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium abundance.We performed a direct measurement of this break-out reaction at the China Jinping underground laboratory.The measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass frame.The key resonance was observed at 225.2 keV for the first time.At a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear ^(19)F(p,γ)^(20) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE rate.This is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the ^(19)F(p,γ)^(20) Ne reaction than previously envisioned.This break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars. 展开更多
关键词 Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate China Jinping underground laboratory(CJPL) JUNA
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Preliminary research and scheme design of deep underground in situ geo-information detection experiment for Geology in Time
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作者 Heping Xie Ru Zhang +13 位作者 Zetian Zhang Yinshuang Ai Jianhui Deng Yun Chen Yong Zhou Mingchuan Li Liqiang Liu Mingzhong Gao Zeqian Yang Weiqiang Ling Heng Gao Qijun Hao Kun Xiao Chendi Lou 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第1期1-13,共13页
The deep earth,deep sea,and deep space are the main parts of the national“three deep”strategy,which is in the forefront of the strategic deployment clearly defined in China’s 14th Five-Year Plan(2021-2025)and the L... The deep earth,deep sea,and deep space are the main parts of the national“three deep”strategy,which is in the forefront of the strategic deployment clearly defined in China’s 14th Five-Year Plan(2021-2025)and the Long-Range Objectives Through the Year 2035.It is important to reveal the evolutionary process and mechanism of deep tectonics to understand the earth’s past,present and future.The academic con-notation of Geology in Time has been given for the first time,which refers to the multi-field evolution response process of geological bodies at different time and spatial scales caused by geological processes inside and outside the Earth.Based on the deep in situ detection space and the unique geological envi-ronment of China Jinping Underground Laboratory,the scientific issue of the correlation mechanism and law between deep internal time-varying and shallow geological response is given attention.Innovative research and frontier exploration on deep underground in situ geo-information detection experiments for Geology in Time are designed to be carried out,which will have the potential to explore the driving force of Geology in Time,reveal essential laws of deep earth science,and explore innovative technologies in deep underground engineering. 展开更多
关键词 Deep underground Geology in Time China Jinping underground laboratory In situ detection
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The Beishan underground research laboratory for geological disposal of high-level radioactive waste in China:Planning, site selection,site characterization and in situ tests 被引量:76
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作者 Ju Wang Liang Chen +1 位作者 Rui Su Xingguang Zhao 《Journal of Rock Mechanics and Geotechnical Engineering》 CSCD 2018年第3期411-435,共25页
With the rapid development of nuclear power in China, the disposal of high-level radioactive waste(HLW) has become an important issue for nuclear safety and environmental protection. Deep geological disposal is inte... With the rapid development of nuclear power in China, the disposal of high-level radioactive waste(HLW) has become an important issue for nuclear safety and environmental protection. Deep geological disposal is internationally accepted as a feasible and safe way to dispose of HLW, and underground research laboratories(URLs) play an important and multi-faceted role in the development of HLW repositories. This paper introduces the overall planning and the latest progress for China's URL. On the basis of the proposed strategy to build an area-specific URL in combination with a comprehensive evaluation of the site selection results obtained during the last 33 years, the Xinchang site in the Beishan area,located in Gansu Province of northwestern China, has been selected as the final site for China's first URL built in granite. In the process of characterizing the Xinchang URL site, a series of investigations,including borehole drilling,geological mapping, geophysical surveying,hydraulic testing and in situ stress measurements, has been conducted. The investigation results indicate that the geological,hydrogeological, engineering geological and geochemical conditions of the Xinchang site are very suitable for URL construction. Meanwhile, to validate and develop construction technologies for the Beishan URL, the Beishan exploration tunnel(BET), which is a 50-m-deep facility in the Jiujing sub-area, has been constructed and several in situ tests, such as drill-and-blast tests, characterization of the excavation damaged zone(EDZ), and long-term deformation monitoring of surrounding rocks, have been performed in the BET. The methodologies and technologies established in the BET will serve for URL construction.According to the achievements of the characterization of the URL site, a preliminary design of the URL with a maximum depth of 560 m is proposed and necessary in situ tests in the URL are planned. 展开更多
关键词 Beishan Xinchang site GRANITE underground research laboratory(URL) High-level radioactive waste(HLW) Geological disposal
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Evaluation of cosmogenic activation of copper and germanium during production in Jinping Underground Laboratory 被引量:8
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作者 Wei-He Zeng Hao Ma +4 位作者 Ming Zeng Zhi Zeng Qian Yue Jian-Ping Cheng Jun-Li Li 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第5期70-76,共7页
Intrinsic radiation of materials is one of the major backgrounds for many rare-event search experiments.Thus,the production of pure materials in an underground laboratory is a promising approach for eliminating cosmog... Intrinsic radiation of materials is one of the major backgrounds for many rare-event search experiments.Thus,the production of pure materials in an underground laboratory is a promising approach for eliminating cosmogenic radionuclides.In this paper,we demonstrate a procedure to evaluate the yields of cosmogenic radionuclides in copper and germanium in the second phase of the China Jinping Underground Laboratory.Our results show that for copper and germanium materials,the largest cosmogenic background comes from 3 H and57,58,60Co,and 3 H and 68Ge,respectively,which all have yields on the order of 10-7 kg-1 day-1.The corresponding radioactivities after 90 days pf exposure underground are estimated to be lower than 10-6μBq kg-1. 展开更多
关键词 COSMIC RAYS COSMOGENIC radionuclides underground laboratory MONTE Carlo simulation
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On area-specific underground research laboratory for geological disposal of high-level radioactive waste in China 被引量:19
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作者 Ju Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2014年第2期99-104,共6页
Underground research laboratories (URLs), including "generic URLs" and "site-specific URLs", are un- derground facilities in which characterisation, testing, technology development, and/or demonstration activiti... Underground research laboratories (URLs), including "generic URLs" and "site-specific URLs", are un- derground facilities in which characterisation, testing, technology development, and/or demonstration activities are carried out in support of the development of geological repositories for high-level radioactive waste (HLW) disposal. In addition to the generic URL and site-specific URL, a concept of "areaspecific URL", or the third type of URL, is proposed in this paper. It is referred to as the facility that is built at a site within an area that is considered as a potential area for HLW repository or built at a place near the future repository site, and may be regarded as a precursor to the development of a repository at the site. It acts as a "generic URL", but also acts as a "site-specific URL" to some extent. Considering the current situation in China, the most suitable option is to build an "area-specific URL" in Beishan area, the first priority region for China's high-level waste repository. With this strategy, the goal to build China's URL by 2020 mav be achieved, but the time left is limited. 展开更多
关键词 underground research laboratory (URL)Area-specific URL High-level radioactive waste (HLW)Geological disposal
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Excavation of underground research laboratory ramp in granite using tunnel boring machine: Feasibility study 被引量:12
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作者 Hongsu Ma Ju Wang +3 位作者 Ke Man Liang Chen Qiuming Gong Xingguang Zhao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2020年第6期1201-1213,共13页
Underground research laboratory(URL)plays an important role in safe disposal of high-level radioactive waste(HLW).At present,the Xinchang site,located in Gansu Province of China,has been selected as the final site for... Underground research laboratory(URL)plays an important role in safe disposal of high-level radioactive waste(HLW).At present,the Xinchang site,located in Gansu Province of China,has been selected as the final site for China’s first URL,named Beishan URL.For this,a preliminary design of the Beishan URL has been proposed,including one spiral ramp,three shafts and two experimental levels.With advantages of fast advancing and limited disturbance to surrounding rock mass,the tunnel boring machine(TBM)method could be one of the excavation methods considered for the URL ramp.This paper introduces the feasibility study on using TBM to excavation of the Beishan URL ramp.The technical challenges for using TBM in Beishan URL are identified on the base of geological condition and specific layout of the spiral ramp.Then,the technical feasibility study on the specific issues,i.e.extremely hard rock mass,high abrasiveness,TBM operation,muck transportation,water drainage and material transportation,is investigated.This study demonstrates that TBM technology is a feasible method for the Beishan URL excavation.The results can also provide a reference for the design and construction of HLW disposal engineering in similar geological conditions.2020 Institute of Rock and Soil Mechanics,Chinese Academy of Sciences.Production and hosting by Elsevier B.V.This is an open access article under the CC BY-NC-ND license(http://creativecommons.org/licenses/by-nc-nd/4.0/). 展开更多
关键词 underground research laboratory(URL) High-level radioactive waste(HLW)disposal Tunnel boring machine(TBM) Extremely hard rock mass Rock mass boreability Spiral layout Beishan
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A laboratory method to simulate seismic waves induced by underground explosions 被引量:1
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作者 Yuguo Ji Mingyang Wang +4 位作者 Jie Li Shuxin Deng Zhihao Li Tianhan Xu Fei Gao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第5期1514-1530,共17页
The seismic waves induced by underground explosions generate geological hazards affecting deep buried tunnels such as rockbursts and engineering-induced earthquakes. This issue is difficult to study through full-scale... The seismic waves induced by underground explosions generate geological hazards affecting deep buried tunnels such as rockbursts and engineering-induced earthquakes. This issue is difficult to study through full-scale testing due to the expense and unpredictable danger. To solve this problem, the authors developed experimental apparatus and presented a laboratory method to simulate seismic waves induced by underground explosions. In this apparatus, a combined structure of a diffusive-shaped water capsule and a special-shaped oil capsule was designed. This structure can provide an applied confining stress and freely transmit the stress wave generated by external impact. Therefore, the coupled loading of in situ stress and seismic waves induced by underground explosions in the deep rock mass was simulated. The positive pressure time and peak value of the stress wave could be adjusted by changing the pulse-shaper and the initial impact energy. The obtained stress waves in the experiments correspond to that generated by 0.15-120 kt of TNT equivalent explosion at a scaled distance of 89.9-207.44 m/kt. 展开更多
关键词 laboratory method Seismic wave underground explosion Deep rock mass Coupled loading Experimental apparatus
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Exploring the frontiers of deep underground sciences and engineering—China Yunlong Lake Laboratory is striving to be the best
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作者 Lihua Hu Jianguo Wang +3 位作者 Ali Karrech Xiaozhao Li Peng Zhao Lulu Liu 《Deep Underground Science and Engineering》 2022年第2期131-137,共7页
This paper introduces the establishment of deep underground infrastructure for science and engineering research.First,the representative deep underground research laboratories and facilities in the world and their fun... This paper introduces the establishment of deep underground infrastructure for science and engineering research.First,the representative deep underground research laboratories and facilities in the world and their functions were summarized and reviewed.Then,the plan and service target of China Yulong Lake Laboratory were proposed for the storage of resources and energy,as well as the sealing of hazardous waste in deep underground space.On this basis,this paper reveals how the facility addresses its key scientific issue on“The law of fluid matter migration in deep underground space”and engineering significance.Finally,the construction progress of the facility components was demonstrated in details.As is hoped,this paper would provide useful reference to the deep underground research community;meanwhile,international collaboration on deep underground research is highly welcome. 展开更多
关键词 fluid matter migration large spatial scale long time scale multi-lithology research laboratory and facility underground space
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高放废物处置地下实验室现场试验数据管理顶层设计
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作者 王鹏 王驹 +1 位作者 黄树桃 马明清 《世界核地质科学》 CAS 2024年第5期997-1005,共9页
我国高放废物地质处置研发已经进入地下实验室建设的关键阶段。在地下实验室建设和运行期间,将开展大量现场试验,这些试验数据具有传输距离长、采集周期长、数据类型多和数据量大等特点,同时数据质量、安全与可追溯性要求高,数据管理难... 我国高放废物地质处置研发已经进入地下实验室建设的关键阶段。在地下实验室建设和运行期间,将开展大量现场试验,这些试验数据具有传输距离长、采集周期长、数据类型多和数据量大等特点,同时数据质量、安全与可追溯性要求高,数据管理难度较大。通过分析我国高放废物地质处置北山地下实验室现场试验数据特点,以iS3智慧数据服务系统为基础,提出现场试验数据管理顶层设计方法,为现场试验和科研工作顺利开展提供重要的数据管理支撑。 展开更多
关键词 高放废物处置 地下实验室 现场试验数据管理 顶层设计
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淮南深地地磁总场连续观测与时变特征
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作者 郭良辉 王博 +4 位作者 宋晓林 王赟 金承奕 姚硕 史钰峰 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2024年第2期820-828,共9页
深地实验室具有电磁干扰小的"超净"地磁观测优势,已成为地磁观测的新平台和研究热点.为了评估淮南深地实验室地磁环境、认识地磁总场时变特征及地下与地面耦合性,我们于2022年在地下巷道(-848 m)和地表(+22 m)同步实施了地磁... 深地实验室具有电磁干扰小的"超净"地磁观测优势,已成为地磁观测的新平台和研究热点.为了评估淮南深地实验室地磁环境、认识地磁总场时变特征及地下与地面耦合性,我们于2022年在地下巷道(-848 m)和地表(+22 m)同步实施了地磁总场长期连续观测,对观测数据进行了功率谱、小波谱、地磁总场变化特征的分析及与附近的蒙城地磁台比对.研究结果表明:(1)地下无(或弱)磁干扰点位的地磁环境较优越,与蒙城地磁台相媲美,适用于地磁场变化的高精度、长期连续观测;(2)地下地磁观测可有效过滤地表上由工业与人类活动等的电磁干扰,其记录的地磁总场变化与蒙城地磁台具有较好的耦合性;(3)地下磁测可清晰记录地磁总场的平静变化、不同周期磁暴、地磁脉冲等丰富的时变信息,可为地球系统科学研究提供地磁学依据. 展开更多
关键词 深地实验室 地磁总场 时间变化 观测 地磁环境
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我国高放废物地质处置新突破
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作者 王驹 陈亮 +7 位作者 周志超 赵星光 田霄 季瑞利 马洪素 曹胜飞 凌辉 康明亮 《原子能科学技术》 EI CAS CSCD 北大核心 2024年第S02期217-230,共14页
2019年5月6日,国家原子能机构批复了我国高放废物地质处置地下实验室建设工程立项建议书。2021年6月17日,地下实验室工程正式开工建设,标志着我国高放废物地质处置进入一个新的阶段——地下实验室阶段,实现了新的突破。本文介绍近五年(2... 2019年5月6日,国家原子能机构批复了我国高放废物地质处置地下实验室建设工程立项建议书。2021年6月17日,地下实验室工程正式开工建设,标志着我国高放废物地质处置进入一个新的阶段——地下实验室阶段,实现了新的突破。本文介绍近五年(2019-2024)来我国高放废物地质处置在法律法规、技术标准、场址评价、缓冲材料、工程技术、岩石力学、放射性核素迁移和安全评价等方面取得的新进展,重点介绍北山地下实验室工程建设及研究开发的新进展。 展开更多
关键词 中国 高放废物 地质处置 北山地下实验室 场址评价
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用于深地核天体物理实验的无窗气体靶差分结构和热效应研究
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作者 蒋宇辰 连钢 +6 位作者 方晓 李云居 曹富强 南巍 曾晟 谌阳平 柳卫平 《原子能科学技术》 EI CAS CSCD 北大核心 2024年第S01期1-8,共8页
我国锦屏深地核天体物理(JUNA)平台是世界上束流强度最高的深地实验平台,为我国争取核天体物理国际领先地位提供了重要机遇。无窗气体靶是深地低能核天体物理实验测量的关键设备,可实现特定同位素参与核反应的直接测量,能有效拓展深地... 我国锦屏深地核天体物理(JUNA)平台是世界上束流强度最高的深地实验平台,为我国争取核天体物理国际领先地位提供了重要机遇。无窗气体靶是深地低能核天体物理实验测量的关键设备,可实现特定同位素参与核反应的直接测量,能有效拓展深地实验的研究范围。国际上已有多家实验室将无窗气体靶应用于低能核反应的研究,但针对的都是较低流强的实验。为适应锦屏高功率强束流的实验需求,本工作设计可用于强流束的气体靶装置。通过Ansys Fluent和COMSOL软件模拟计算,验证了多级差分结构的可行性,并研究了靶厚的束流加热效应和量热器热效应,提出了无窗气体靶实验的设计优化方案,为后续JUNA深地实验研究的发展提供了可靠依据。 展开更多
关键词 核天体物理 深地实验室 无窗气体靶 低能核反应
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极低水平γ射线辐射场散射辐射研究
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作者 耿璇 滕忠斌 +5 位作者 杭仲斌 李俏 贾茗涵 胡凯漩 宋明哲 刘蕴韬 《同位素》 CAS 2024年第3期267-273,共7页
为了搭建极低水平γ射线辐射场及其量值传递系统,基于中国锦屏地下实验室实验条件,对辐射场中不同机械装置结构带来的散射贡献进行研究。本研究利用蒙特卡罗模拟软件建立照射装置、量值传递探测器和屏蔽箱及内部传动结构的蒙特卡罗模型... 为了搭建极低水平γ射线辐射场及其量值传递系统,基于中国锦屏地下实验室实验条件,对辐射场中不同机械装置结构带来的散射贡献进行研究。本研究利用蒙特卡罗模拟软件建立照射装置、量值传递探测器和屏蔽箱及内部传动结构的蒙特卡罗模型;对照射装置射线出射角度、探-边距和源-探距三种空间变量引起的散射贡献进行模拟研究,得出较优的装置设计和布局方案。设计20°、30°、40°的辐射出射张角,并且在三种源探距的情况下,分别计算有、无屏蔽箱时探测器灵敏体积中的能量沉积;分析三种照射装置位置改变带来的能量沉积的变化;在更多种源-探距下,模拟计算灵敏区域的能量沉积。结果表明,在辐射出射张角为20°和照射装置远离屏蔽箱的内侧面时,散射辐射对探测器灵敏体积内的能量沉积影响最小。本研究得到和分析了多种照射条件下散射辐射引起的能量沉积,优化了辐射场中装置设计和布局,为极低本底辐射场的建立提供了设计思路,并完成了中国锦屏地下实验室的实地测量。 展开更多
关键词 地下实验室 低本底 参考辐射 散射辐射 蒙特卡罗方法
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北山1号TBM刀盘破岩振动影响参数分析
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作者 段志远 龚秋明 +4 位作者 王驹 马洪素 黄流 刘东鑫 彭治元 《世界核地质科学》 CAS 2024年第4期805-816,840,共13页
隧道掘进机在掘进过程中,刀盘破碎岩石会产生振动,刀盘振动对TBM机械与施工会造成负面影响。依托甘肃北山地下实验室斜坡道工程TBM施工段,在北山1号TBM上搭载振动监测系统,通过跟踪现场施工和开展掘进试验,收集研究区段的隧道设计工况... 隧道掘进机在掘进过程中,刀盘破碎岩石会产生振动,刀盘振动对TBM机械与施工会造成负面影响。依托甘肃北山地下实验室斜坡道工程TBM施工段,在北山1号TBM上搭载振动监测系统,通过跟踪现场施工和开展掘进试验,收集研究区段的隧道设计工况信息、围岩信息、掘进参数与刀盘振动信息。开展不同隧道设计工况、围岩类别、掘进参数对刀盘破岩振动的影响分析。研究结果表明:1)隧道转弯段与直线段的TBM刀盘振动强度、主振频率具有一定差异,转弯段TBM刀盘振动强度更大、主要频率更高;2)不同围岩类别下,转弯段刀盘振动主振频率差异较大,而直线段差异较小;3)随着推力、转速的提高,刀盘的振动强度增大,但刀盘三轴振动主振频率不发生改变。 展开更多
关键词 隧道掘进机(TBM) 北山地下实验室 北山1号TBM 刀盘 破岩振动
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Three-dimensional stress variation characteristics in deep hard rock of CJPL-Ⅱ project based on in-situ monitoring
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作者 Minzong Zheng Shaojun Li +2 位作者 Zejie Feng Huaisheng Xu Yaxun Xiao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第2期179-195,共17页
In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensi... In deep hard rock excavation, stress plays a pivotal role in inducing stress-controlled failure. While the impact of excavation-induced stress disturbance on rock failure and tunnel stability has undergone comprehensive examination through laboratory tests and numerical simulations, its validation through insitu stress tests remains unexplored. This study analyzes the three-dimensional stress changes in the surrounding rock at various depths, monitored during the excavation of B2 Lab in China Jinping Underground Laboratory Phase Ⅱ(CJPL-Ⅱ). The investigation delves into the three-dimensional stress variation characteristics in deep hard rock, encompassing stress components and principal stress. The results indicate changes in both the magnitude and direction of the principal stress during tunnel excavation. To quantitatively describe the degree of stress disturbance, a series of stress evaluation indexes are established based on the distances between stress tensors, including the stress disturbance index(SDI), the principal stress magnitude disturbance index(SDIm), and the principal stress direction disturbance index(SDId). The SDI indicates the greatest stress disturbance in the surrounding rock is 4.5 m from the tunnel wall in B2 Lab. SDIm shows that the principal stress magnitude disturbance peaks at2.5 m from the tunnel wall. SDId reveals that the largest change in principal stress direction does not necessarily occur near the tunnel wall but at a specific depth from it. The established relationship between SDI and the depth of the excavation damaged zone(EDZ) can serve as a criterion for determining the depth of the EDZ in deep hard rock engineering. Additionally, it provides a reference for future construction and support considerations. 展开更多
关键词 Disturbance stress Tensor distance Stress disturbance index Principal stress direction underground research laboratory
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NνDEx-100 conceptual design report
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作者 Xi-Guang Cao Yan-Long Chang +35 位作者 Kai Chen Emilio Ciuffoli Li-Min Duan Dong-Liang Fang Chao-Song Gao Surja K.Ghorui Peng-Chong Hu Qiang Hu Si-Yuan Huang Ze-Yu Huang Lei Lang Yu-Lan Li Zhi-Jie Li Tian-Yu Liang Jun Liu Chen-Gui Lu Fa-Tai Mai Yuan Mei Hao Qiu Xiang-Ming Sun Xiao-Xing Tang Hu-Lin Wang Qian-Ming Wang Le Xiao Mu-Yun Xiao Jian-Yu Xin Nu Xu Peng Yang Yi-Chen Yang Zhen Yang Zong-Yang Yu Dong-Liang Zhang Jun-Wei Zhang Cheng-Xin Zhao Dou Zhu NνDEx-100 collaboration 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第1期18-33,共16页
Observing nuclear neutrinoless double beta (0vββ) decay would be a revolutionary result in particle physics.Observing such a decay would prove that the neutrinos are their own antiparticles,help to study the absolut... Observing nuclear neutrinoless double beta (0vββ) decay would be a revolutionary result in particle physics.Observing such a decay would prove that the neutrinos are their own antiparticles,help to study the absolute mass of neutrinos,explore the origin of their mass,and may explain the matter-antimatter asymmetry in our universe by lepton number violation.We propose developing a time projection chamber (TPC) using high-pressure ^(82)SeF_(6) gas and Topmetal silicon sensors for readout in the China Jinping Underground Laboratory (CJPL) to search for neutrinoless double beta decay of82Se,called the NvDEx experiment.Besides being located at CJPL with the world’s thickest rock shielding,NvDEx combines the advantages of the high Qββ(2.996 MeV) of82Se and the TPC’s ability to distinguish signal and background events using their different topological characteristics.This makes NvDEx unique,with great potential for low-background and high-sensitivity 0 vββsearches.NvDEx-100,a NvDEx experiment phase with 100 kg of SeF_(6)gas,is being built,with plans to complete installation at CJPL by 2025.This report introduces 0 vββ physics,the NvDEx concept and its advantages,and the schematic design of NvDEx-100,its subsystems,and background and sensitivity estimation. 展开更多
关键词 Neutrinoless double beta decay Time projection chamber ^(82)SeF_(6) China Jinping underground laboratory
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高放废物地下实验室岩壁吊车梁优化设计研究
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作者 李静 《铀矿冶》 CAS 2024年第3期106-112,共7页
北山高放废物地质处置地下实验室是中国首个研究高放废物地质处置的地下实验室。在该地下实验室-560 m的主试验水平内布置了起重量为5 t的电动单梁起重机岩壁吊车梁。本研究以相关设计规范为依据,阐述岩壁吊车梁的计算方法及设计步骤,... 北山高放废物地质处置地下实验室是中国首个研究高放废物地质处置的地下实验室。在该地下实验室-560 m的主试验水平内布置了起重量为5 t的电动单梁起重机岩壁吊车梁。本研究以相关设计规范为依据,阐述岩壁吊车梁的计算方法及设计步骤,并提出了对于起重机吨位较小的岩壁吊车梁的优化设计方案。优化方案可有效节省岩壁吊车梁的材料和宝贵的地下空间,本研究结果对小吨位起重机岩壁吊车梁设计有借鉴意义。 展开更多
关键词 岩壁吊车梁 地下实验室 刚体平衡法 优化设计 高放废物 地质处置
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锦屏深地核天体物理实验进展 被引量:1
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作者 连钢 郭冰 +8 位作者 谌阳平 苏俊 李志宏 何建军 唐晓东 崔保群 孙良亭 安竹 柳卫平 《原子能科学技术》 EI CAS CSCD 北大核心 2023年第8期1482-1497,共16页
深地极低辐射本底环境是核天体物理关键反应直接测量的基础。1990年世界首个深地核天体物理实验项目LUNA在意大利LNGS启动,此后美国和中国也开展了深地实验研究。为实现核天体物理关键反应的精确测量,我国在中国锦屏地下实验室建立了首... 深地极低辐射本底环境是核天体物理关键反应直接测量的基础。1990年世界首个深地核天体物理实验项目LUNA在意大利LNGS启动,此后美国和中国也开展了深地实验研究。为实现核天体物理关键反应的精确测量,我国在中国锦屏地下实验室建立了首个深地核天体物理实验项目,即JUNA项目。JUNA研制了强流高稳定加速器装置,束流强度超过意大利LUNA装置的10倍,同时发展了一系列极低辐射本底环境下的测量技术。2021年,JUNA试运行期间完成了多项重元素合成核天体物理关键反应的直接测量,取得重要研究成果。本文对JUNA项目的深地测量技术和开展的实验研究进行综述,并展望以束流强度和测量技术的突破为主要目标的新一代深地实验计划。 展开更多
关键词 核天体物理 反应截面 地下实验室 深地测量技术
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高放废物地质处置地下实验室开挖及精细探测关键技术 被引量:12
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作者 陈亮 王驹 +12 位作者 杨峰 马洪素 李二兵 王贵宾 王春萍 赵星光 刘建锋 王锡勇 刘健 孙永强 乔旭 成功 李冬伟 《世界核地质科学》 CAS 2023年第1期1-16,共16页
针对高放废物处置地下实验室工程建造面临的主要技术难题和挑战,以甘肃北山预选区新场-旧井地段为研究目标场址,建成了北山坑探设施工程并以此为研发平台,通过试验研究、理论建模和数值模拟等多重综合集成的研究方法,开展了地下实验室... 针对高放废物处置地下实验室工程建造面临的主要技术难题和挑战,以甘肃北山预选区新场-旧井地段为研究目标场址,建成了北山坑探设施工程并以此为研发平台,通过试验研究、理论建模和数值模拟等多重综合集成的研究方法,开展了地下实验室围岩含水结构面超前探测技术、地下实验室开挖方法及开挖损伤区评价技术、围岩开挖响应监测技术和围岩力学时效特性评价技术等研究,成功实施了不良地质体超前探测、围岩变形监测、光面爆破和开挖损伤区评价等11种现场试验,突破了地下实验室围岩含水结构面精细探测技术、低损高效破岩及评价技术、围岩位移全过程监测技术和围岩长期稳定性分析技术,掌握了高放废物地质处置地下实验室工程设计、建造有关的关键安全技术。相关成果为地下实验室设计和建造提供了重要的理论基础和技术支撑,显著提升了我国在高放废物处置领域的研发能力。 展开更多
关键词 高放废物处置 地下实验室 低损高效开挖 精细探测 围岩长期稳定性
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中国高放废物地质处置北山地下实验室重大进展 被引量:6
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作者 王驹 陈亮 +5 位作者 苏锐 周志超 赵星光 田霄 季瑞利 马洪素 《世界核地质科学》 CAS 2023年第S01期473-490,共18页
北山地下实验室是我国建设的首座高放废物地质处置地下实验室,是列入我国国民经济和社会发展“十三五”规划的国家重点项目。该项目于2019年5月获得立项批复、2021年6月正式开工、2022年5月主体工程正式开挖。这标志着我国高放废物地质... 北山地下实验室是我国建设的首座高放废物地质处置地下实验室,是列入我国国民经济和社会发展“十三五”规划的国家重点项目。该项目于2019年5月获得立项批复、2021年6月正式开工、2022年5月主体工程正式开挖。这标志着我国高放废物地质处置工作全面进入全新的地下实验室建设及研发阶段。北山地下实验室位于甘肃省酒泉市西北的戈壁深处。主体工程由主竖井、螺旋斜坡道和两层试验水平组成。主竖井直径6 m,深590 m。螺旋斜坡道直径7.03 m,长约7.0 km,坡度10%,水平转弯半径255 m,采用隧道掘进机开挖,是世界上首条采用隧道掘进机开挖的螺旋斜坡道。自开工以来,关键设备建造、工程建设和相关科研工作取得了重大进展。用于螺旋斜坡道开挖的“北山1号”掘进机,也是世界首台大坡度小转弯隧道掘进机。该设备于2022年9月研制、制造成功,并于2022年12月正式开掘。截至2023年6月30日,主竖井开挖至280 m深,斜坡道掘进至1628 m,位于280 m深的水平试验巷道已经开挖完成100 m。与工程建设配套的科研工作,包括地质编录、水文地质编录、岩体质量评价、地下水监测和生态环境监测等均稳步推进。研究结果表明:地下实验室场址花岗岩完整、裂隙稀少、岩体质量好,开挖的地下巷道稳定。地下水稀少,主要赋存在裂隙密集带中,具有典型的干旱地区花岗岩裂隙地下水的特征。北山地下实验室预计于2027年建成,这将为填补我国在高放废物安全领域研发平台空白、攻克高放废物地质处置这一世界性难题提供试验平台和基础。 展开更多
关键词 北山地下实验室 高放废物 地质处置 “北山1号”岩石掘进机 斜坡道
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