期刊文献+
共找到532篇文章
< 1 2 27 >
每页显示 20 50 100
Black Hole Singularities and Planetary Formation
1
作者 Louise Riofrio 《Journal of Applied Mathematics and Physics》 2024年第4期1079-1088,共10页
The goal of this research is to explore the effects of black hole singularities. Methodology is to start with large objects like galaxies and continue to smaller objects within our solar neighbourhood. High-redshift o... The goal of this research is to explore the effects of black hole singularities. Methodology is to start with large objects like galaxies and continue to smaller objects within our solar neighbourhood. High-redshift observations from the James Webb Space Telescope reveal that distant galaxies and their central black holes formed shortly after the Big Bang. An innovation about the speed of light explains how supermassive black holes could have formed primordially. Predictions of Hawking radiation include the possibility of black holes contributing to the energy of stars such as the Sun. Black holes have also been suggested as a source of radiation and magnetic fields in giant planets. Observations of Enceladus raise the possibility that this moon and other objects near Saturn’s Rings contain small singularities. Extrapolations of this methodology indicate that black holes could exist within solar system bodies including planets. Extended discussion describes how their presence could explain mysteries of internal heat, planetary magnetic fields, and processes of solar system formation. 展开更多
关键词 Black holes GALAXIES Magnetic Fields Planets Planetary formation Speed of Light
下载PDF
Formation and Evolution of Galaxies and Black Holes 被引量:1
2
作者 Cui-xiang Zhong 《Journal of Physical Science and Application》 2018年第1期23-29,共7页
In the past,people did not realize the formation and structure of galaxies.They even mistook the black holes hidden in the center of a galaxy as independent celestial objects,making black holes mysterious and unbeliev... In the past,people did not realize the formation and structure of galaxies.They even mistook the black holes hidden in the center of a galaxy as independent celestial objects,making black holes mysterious and unbelievable.It was only after the author studied and discovered the laws of the formation and evolution of satellites,planets and stars that he put forward the scientific theory of galaxy formation and evolution,therefore revealing the hierarchical structure of galaxy and the existence and characteristics of black holes as the main nodes of galactic structure. 展开更多
关键词 GALACTIC structure GALAXY formation GALAXY EVOLUTION BLACK holes BLACK hole area
下载PDF
Formation of Galaxies in the Context of Gravitational Waves and Primordial Black Holes
3
作者 Shawqi Al Dallal Walid J. Azzam 《Journal of Modern Physics》 2019年第3期214-224,共11页
The recent discovery of gravitational waves has revolutionized our understanding of many aspects regarding how the universe works. The formation of galaxies stands as one of the most challenging problems in astrophysi... The recent discovery of gravitational waves has revolutionized our understanding of many aspects regarding how the universe works. The formation of galaxies stands as one of the most challenging problems in astrophysics. Regardless of how far back we look in the early universe, we keep discovering galaxies with supermassive black holes lurking at their centers. Many models have been proposed to explain the rapid formation of supermassive black holes, including the massive accretion of material, the collapse of type III stars, and the merger of stellar mass black holes. Some of these events give rise to the production of gravitational waves that could be detected by future generations of more sensitive detectors. Alternatively, the existence of these supermassive black holes can be explained in the context of primordial black holes. In this paper we discuss the various models of galaxy formation shedding light on the role that gravitational waves can play to test of the validity of some of these models. We also discuss the prospect of primordial black holes as a seeding constituent for galaxy formation. 展开更多
关键词 GRAVITATIONAL WAVES GALAXY formation Primordial BLACK holeS Supermassive BLACK holeS
下载PDF
Formation and Evolution of Galaxies and Its Black Holes and Quasars
4
作者 Cuixiang Zhong 《Journal of Physical Science and Application》 2021年第2期9-20,共12页
Galaxy formation and evolution is one of the most active research areas in astrophysics,so many people have studied this area.But since they didn’t understand thoroughly the evolution law from satellite to planet the... Galaxy formation and evolution is one of the most active research areas in astrophysics,so many people have studied this area.But since they didn’t understand thoroughly the evolution law from satellite to planet then to star,their theories are very weak.In their theories,they proposed that large gas clouds collapsing to form a galaxy or more recently that matter started out in smaller clumps merged to form galaxy,which is incredible.Hence,the author of this paper,through studying the formation and orbit-variation of satellites,planets and stars,has put forward a new theory of galaxy formation and evolution,therefore revealing the hierarchical structure of galaxies and the formation and evolution of black holes and quasars. 展开更多
关键词 Galaxies:structure galaxies:formation galaxies:evolution stars:black holes stars:quasars
下载PDF
Hole-Pair Formation in Cuprate Superconductors despite Antiferromagnetic Fluctuations
5
作者 Rana Janardon Singh Shakeel Khan 《World Journal of Condensed Matter Physics》 2014年第3期141-152,共12页
We have earlier proposed models of preformed hole pairs based on the results of our electron paramagnetic resonance experiments. A hole doped in a cuprate superconductor causes ferromagnetic alignment of the spins of ... We have earlier proposed models of preformed hole pairs based on the results of our electron paramagnetic resonance experiments. A hole doped in a cuprate superconductor causes ferromagnetic alignment of the spins of the holes of 4 Cu2+ ions of the plaquette (CuO)4 in which it enters. Spin alignments undergo oscillations from vertically upward to vertically downward of the CuO2 plane. Vertical projections of spins go on changing when they pass through different plaquettes going to zero when they pass through the CuO2 plane. Ferromagnetic alignments of spins produce magnetic fields on the plane proportional to their vertical projections. When two holes travelling in CuO2 plane come across each other at a certain distance between them, they are attracted towards each other by Heisenberg exchange interaction and their path is decided by the magnetic field produced due to spin alignments. Their path is similar to 3dx2 - y2 atomic orbital. Y-123 has been chosen as an example. Due to plethora of evidence of antiferromagnetic fluctuations in cuprates, hole-pair formation has been tried in Y-123 assuming antiferromagnetic fluctuations in it. It has been found that hole-pair formation in spite of AFM fluctuations can be explained on the same lines as done earlier. Hole-pair formation was tried in Tl-2201 to test whether the same rules apply in cuprates with very high coherence lengths. Coherence length in Tl-2201 = 52 &Aring, whereas in Y-123 = 15 20 &Aring in CuO2 plane. It has been reported that in Tl-2201 the CuO2 plane is very flat and smooth. From this it was concluded that high coherence length is the result of the smoothness of the plane. Further it was concluded that the smoothness of the CuO2 plane depends upon the nature of the near neighbors of the CuO2 plane. Near neighbors of Y-123 and Tl-2201 have been compared. 展开更多
关键词 hole-Pair formation in CUPRATE SUPERCONDUCTORS Buckling Angle in CuO2 PLANE Coherence Length in a-b-Plane ζab
下载PDF
深孔钻进技术方法的探究和思索
6
作者 刘伟 陈磊 +3 位作者 李石林 靖安 王江陵 李志富 《世界有色金属》 2024年第13期175-177,共3页
矿产资源对人类生存和发展而言是重要的物质基础,矿业在我国产业经济中处于“上游”地位,对社会产业链有极大影响,如何利用好现有技术方法且不断突破传统观念的束缚,是我们地质工作者探求新知识的内在要求与核心动力。钻探施工属于隐蔽... 矿产资源对人类生存和发展而言是重要的物质基础,矿业在我国产业经济中处于“上游”地位,对社会产业链有极大影响,如何利用好现有技术方法且不断突破传统观念的束缚,是我们地质工作者探求新知识的内在要求与核心动力。钻探施工属于隐蔽性工程,钻遇的地层岩性具有很大的不确定性,“三难”问题不同程度的制约了钻探施工生产。 展开更多
关键词 深孔 钻探技术 复杂地层
下载PDF
雪峰弧构造带钻孔轨迹控制关键技术研究
7
作者 潘德元 贺前平 +2 位作者 蔡隽 周成建 赖小彬 《钻探工程》 2024年第5期108-114,共7页
随着近年来矿产资源勘查要求的提高,岩心钻孔的深度及地层复杂性也不断加大,为能精准的钻遇靶区矿体以实现地质目的,对钻孔轨迹控制的要求越来越高。雪峰弧构造带部分工作区地层倾角大、软硬交替频繁、地层破碎,实际施工中地层造斜情况... 随着近年来矿产资源勘查要求的提高,岩心钻孔的深度及地层复杂性也不断加大,为能精准的钻遇靶区矿体以实现地质目的,对钻孔轨迹控制的要求越来越高。雪峰弧构造带部分工作区地层倾角大、软硬交替频繁、地层破碎,实际施工中地层造斜情况严重,随着孔深增加导致终孔轨迹与靶区矿体偏差较大,影响矿产资源勘查的精度和质量。通过对该工作区地层造斜情况的深入分析,在ZK1001钻孔绳索取心钻进施工中采用初级定向孔技术和满眼钻具工艺,大幅度提高了钻孔孔身质量,较好地实现钻孔轨迹控制。并通过试验不同的岩心钻具组合,提出了满眼钻具组合的优化意见和建议,为工作区岩心钻孔轨迹控制提供技术参考。 展开更多
关键词 绳索取心钻进 地层造斜力 轨迹控制 初级定向孔 满眼钻具 雪峰弧构造带
下载PDF
承德县张营子矿区zk0806孔的纠偏技术
8
作者 邢运涛 《地质装备》 2024年第3期41-44,共4页
张营子矿区于2011年开始施工,累计完成钻孔18个,钻探工作量25 328.19 m。矿区太古代单塔子群白庙组以片麻岩为主,节理、片理发育,岩层倾角60°~70°,个别产状更陡,钻遇此层极易发生钻孔偏斜,增大施工难度。zk0806孔采取陀螺仪... 张营子矿区于2011年开始施工,累计完成钻孔18个,钻探工作量25 328.19 m。矿区太古代单塔子群白庙组以片麻岩为主,节理、片理发育,岩层倾角60°~70°,个别产状更陡,钻遇此层极易发生钻孔偏斜,增大施工难度。zk0806孔采取陀螺仪高边角定向法进行孔内定向,选择1.25°螺杆和95 mm表镶金刚石单管钻进工艺进行两次技术纠偏,最终达到地质要求。 展开更多
关键词 地层造斜 钻孔结构 钻井液 螺杆钻纠偏
下载PDF
Effect of Ti and Ta content on the oxidation resistance of Co-Ni-based superalloys 被引量:1
9
作者 Yuheng Zhang Zixin Li +2 位作者 Yunwei Gui Huadong Fu Jianxin Xie 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第2期351-361,共11页
Co-Ni-based superalloys are known for their capability to function at elevated temperatures and superior hot corrosion and thermal fatigue resistance.Therefore,these alloys show potential as crucial high-temperature s... Co-Ni-based superalloys are known for their capability to function at elevated temperatures and superior hot corrosion and thermal fatigue resistance.Therefore,these alloys show potential as crucial high-temperature structural materials for aeroengine and gas turbine hot-end components.Our previous work elucidated the influence of Ti and Ta on the high-temperature mechanical properties of alloys.However,the intricate interaction among elements considerably affects the oxidation resistance of alloys.In this paper,Co-35Ni-10Al-2W-5Cr-2Mo-1Nb-xTi-(5−x)Ta alloys(x=1,2,3,4)with varying Ti and Ta contents were designed and compounded,and their oxidation resistance was investigated at the temperature range from 800 to 1000℃.After oxidation at three test conditions,namely,800℃for 200 h,900℃for 200 h,and 1000℃for 50 h,the main structure of the oxide layer of the alloy consisted of spinel,Cr_(2)O_(3),and Al_(2)O_(3)from outside to inside.Oxides consisting of Ta,W,and Mo formed below the Cr_(2)O_(3)layer.The interaction of Ti and Ta imparted the highest oxidation resistance to 3Ti2Ta alloy.Conversely,an excessive amount of Ti or Ta resulted in an adverse effect on the oxidation resistance of the alloys.This study reports the volatilization of W and Mo oxides during the oxidation process of Co-Ni-based cast superalloys with a high Al content for the first time and explains the formation mechanism of holes in the oxide layer.The results provide a basis for gaining insights into the effects of the interaction of alloying elements on the oxidation resistance of the alloys they form. 展开更多
关键词 Co-Ni-based superalloys high-temperature oxidation Ti and Ta elements formation mechanism of holes
下载PDF
自张式膨胀管技术的研究与应用 被引量:1
10
作者 龚恩德 邓祖保 +1 位作者 马敏 喻荣华 《钻探工程》 2024年第1期83-90,共8页
孔内膨胀管钻探技术是保障复杂地层孔壁稳定的有效技术之一。本文针对易出现缩径、坍塌、掉块的强水敏性地层,提出了一种自张式膨胀管护壁方法,并根据该方法的护壁原理研制了相适配的新型扩孔钻具、膨胀管及膨胀管投送装置,在不改变钻... 孔内膨胀管钻探技术是保障复杂地层孔壁稳定的有效技术之一。本文针对易出现缩径、坍塌、掉块的强水敏性地层,提出了一种自张式膨胀管护壁方法,并根据该方法的护壁原理研制了相适配的新型扩孔钻具、膨胀管及膨胀管投送装置,在不改变钻孔结构的情况下,对复杂孔段进行局部扩孔,投送膨胀管借助自身张力自然弹开而固定在相应的扩孔段,实现钻进时护壁。通过室内及现场试验对机具进行了优化,最终取得了良好的应用效果。试验证明:该方法操作简单可靠、易于定位,相较于水泥浆护壁具有处理速度快、停待时间短、减少重复处理等优势,适用于岩心钻探领域多孔段复杂地层的固壁与护壁,有利于降低孔内事故处理的成本、提高钻进效率,具有较好的推广应用价值。 展开更多
关键词 强水敏地层 护壁 不改变钻孔结构 局部扩孔 自张式膨胀管 投送器
下载PDF
裸眼侧钻技术在川马页1井的应用实践
11
作者 程悦瀚 张统得 +2 位作者 赵瞻 樊腊生 钱锋 《钻探工程》 2024年第5期122-129,共8页
川马页1井为部署在四川省马边地区的一口页岩气参数井,该井在钻进至3437.58 m时出现井内复杂,在第一阶段处理无果后对其进行了注水泥封井。针对川马页1井的复杂情况,提出了三开裸眼段侧钻方案。在分析了近钻头位置侧向力影响因素的基础... 川马页1井为部署在四川省马边地区的一口页岩气参数井,该井在钻进至3437.58 m时出现井内复杂,在第一阶段处理无果后对其进行了注水泥封井。针对川马页1井的复杂情况,提出了三开裸眼段侧钻方案。在分析了近钻头位置侧向力影响因素的基础上,结合实际情况优选了侧钻点、侧钻方式和侧钻钻具组合,确定了侧钻技术措施。经过2次侧钻施工,克服了邻井资料缺乏、侧钻深度大、地层复杂易垮塌、侧钻井段井温高、地层强度高、原井眼井斜小、侧钻方位限制等施工难点,最终侧钻出新井眼并钻达预定井深。为该地区后续钻井施工与复杂处理提供了借鉴。 展开更多
关键词 页岩气参数井 裸眼侧钻 侧向力 钻头选型 硬地层 钻井复杂
下载PDF
阳山矿区严重漏失垮塌地层钻进工艺及工程实践 被引量:1
12
作者 杨科 罗龙 +2 位作者 曹灶开 廖麟祥 涂晓彬 《钻探工程》 2024年第2期119-126,共8页
严重漏失、垮塌地层快速钻进工艺的研究与应用是当前固体矿产勘查地质岩心钻探亟需解决的问题之一。文章结合甘肃阳山金矿钻探工程实践,针对长孔段的严重漏失、垮塌地层,总结了一套适用于该矿区快速勘探的绳索取心钻进和全面钻进、顶漏... 严重漏失、垮塌地层快速钻进工艺的研究与应用是当前固体矿产勘查地质岩心钻探亟需解决的问题之一。文章结合甘肃阳山金矿钻探工程实践,针对长孔段的严重漏失、垮塌地层,总结了一套适用于该矿区快速勘探的绳索取心钻进和全面钻进、顶漏钻进工艺,采用水泥临时封堵、套管封堵、扩孔、跟管等方式进行封堵的钻进方法,分析了其应用效果,提出了在该地层钻进的认识与思考,以期为同类型地层钻探提供参考。 展开更多
关键词 顶漏钻进 漏失地层 垮塌地层 全面钻进 绳索取心钻进 阳山矿区
下载PDF
粉煤地层绳索取心钻进孔壁坍塌分析及处理 被引量:1
13
作者 丁宁宁 马天捧 +6 位作者 姚雷 浦志 赵兴达 张博 朱晓东 王俊鹏 秦正运 《钻探工程》 2024年第2期127-132,共6页
在甘肃省景泰县郭家台煤炭资源详查ZK30-1孔施工中,因强行提“水钻”造成了长孔段孔壁严重坍塌事故。分析认为坍塌地层粉煤层位多、累计厚度大,围岩结构松散、破碎是造成孔壁坍塌的地质因素;冲洗液性能与地层岩性不适应是主要技术因素... 在甘肃省景泰县郭家台煤炭资源详查ZK30-1孔施工中,因强行提“水钻”造成了长孔段孔壁严重坍塌事故。分析认为坍塌地层粉煤层位多、累计厚度大,围岩结构松散、破碎是造成孔壁坍塌的地质因素;冲洗液性能与地层岩性不适应是主要技术因素。通过引入低粘强抑制冲洗液,扫孔过程中轻压慢转、小泵量循环,成功处理了孔壁坍塌,顺利终孔。煤田钻探施工对冲洗液性能要求严格,用绳索取心钻探粉煤对冲洗液性能要求更为苛刻,在冲洗液配制和钻进过程中尤其需要加强对其性能变化的监控。 展开更多
关键词 绳索取心 粉煤地层 孔壁坍塌 扫孔 冲洗液性能 煤田钻探
下载PDF
硬地层防斜打快底部钻具组合结构优化研究
14
作者 花谊昌 龙远 +2 位作者 王学迎 王越之 荣淮 《天然气与石油》 2024年第3期110-116,共7页
准噶尔盆地阜康地区深部地层岩石硬度高、地层倾角大,传统的钟摆钻具组合提速工具防斜打快效果差。针对这一问题,在对硬地层中使用扭力冲击器提高机械钻速效果分析基础上,提出了既能充分释放钻压、发挥扭力冲击器提速作用,又能在大倾角... 准噶尔盆地阜康地区深部地层岩石硬度高、地层倾角大,传统的钟摆钻具组合提速工具防斜打快效果差。针对这一问题,在对硬地层中使用扭力冲击器提高机械钻速效果分析基础上,提出了既能充分释放钻压、发挥扭力冲击器提速作用,又能在大倾角地层有效防斜的“扭力冲击器+单弯螺杆”底部钻具组合(Bottom Hole Assembly, BHA)。基于平衡趋势分析研究了BHA结构参数对其防斜能力的影响,确定了关键参数。现场应用表明,新设计的BHA能有效实现硬地层防斜打快目的,为深部硬地层钻井作业提供了一定借鉴。 展开更多
关键词 硬地层 单弯双稳 底部钻具组合 直井防斜 扭力冲击器
下载PDF
深厚淤泥地层超静水压力条件下超深灌注桩施工孔壁稳定性研究 被引量:2
15
作者 张锦栋 《市政技术》 2024年第1期116-123,共8页
依托某地铁车辆段管桩施工后超静水压力条件下的钻孔灌注桩工程,研究了超静水压力条件下钻孔孔壁的稳定条件。推导出了孔壁坍塌的临界水力坡度公式和保证孔壁稳定性的临界固结度公式,并分析了土体固结对孔壁稳定的影响;探讨了新奥法原... 依托某地铁车辆段管桩施工后超静水压力条件下的钻孔灌注桩工程,研究了超静水压力条件下钻孔孔壁的稳定条件。推导出了孔壁坍塌的临界水力坡度公式和保证孔壁稳定性的临界固结度公式,并分析了土体固结对孔壁稳定的影响;探讨了新奥法原理在淤泥质软土超静孔隙水压力下灌注桩成孔中的应用。研究结果表明:饱和淤泥质地层中管桩施工后超静孔隙水产生的渗透力是造成灌注桩钻孔过程中孔壁变形失稳的主要因素;土体的黏聚力是影响钻孔缩颈和塌孔的关键参数;超静水压力下软土中钻孔孔壁的稳定条件主要是圆拱支撑力和渗透力;钻孔期间孔壁土体的蠕变大、渗透路径短和土体能在较短时间内发生较大的固结可使孔壁达到稳定的平衡状态;超静孔隙水压力条件下的软土可以借鉴新奥法原理进行钻孔灌注桩成孔。 展开更多
关键词 淤泥地层 超静水压力 钻孔灌注桩 孔壁稳定性
下载PDF
中浅层煤层气井定量化排采制度
16
作者 马雄强 余莉珠 +4 位作者 王大猛 翟志伟 李坤潮 韩波 赵子豪 《大庆石油地质与开发》 CAS 北大核心 2024年第2期168-174,共7页
针对中浅层煤层气井排采制度与低渗透煤储层解吸-扩散-渗流特征不匹配的问题,以大宁-吉县区块为例,从煤层气低产井及低产原因入手,将煤层气井低产原因归纳为地质因素、工程因素及排采因素,排采因素又可进一步细化为初期排液速度慢、压... 针对中浅层煤层气井排采制度与低渗透煤储层解吸-扩散-渗流特征不匹配的问题,以大宁-吉县区块为例,从煤层气低产井及低产原因入手,将煤层气井低产原因归纳为地质因素、工程因素及排采因素,排采因素又可进一步细化为初期排液速度慢、压降传播规律复杂和煤粉伤害3个方面。结合原因分析和工程实践,优化煤层气井排采制度,提出中浅层煤层气井“4321”排采管控方案:划分4大排采阶段、抓好3个关键控制点、实现2项参数平衡、形成1个排采标准模版。实践表明,采用“4321”排采管控方案,利用关键点、重要参数等定量化排采制度,缩小排采参数取值范围,可以有效提高煤层气井稳产能力,使气井稳产期产气量大于900 m^(3)/d。研究成果可为中浅层煤层气井排采制度的制定提供有效借鉴。 展开更多
关键词 煤层气 排采 储层伤害 井底压力
下载PDF
The Origin of the Flat Rotation Curves in Spiral Galaxies: The Hidden Roles of Glitching SMDEOs and Emission of Gravitational Waves
17
作者 Ahmad A. Hujeirat Peter Berczik 《Journal of Modern Physics》 2024年第10期1523-1542,共20页
Supermassive DEOs (SMDEOs) are cosmologically evolved objects made of irreducible incompressible supranuclear dense superfluids: The state we consider to govern the matter inside the cores of massive neutron stars. Th... Supermassive DEOs (SMDEOs) are cosmologically evolved objects made of irreducible incompressible supranuclear dense superfluids: The state we consider to govern the matter inside the cores of massive neutron stars. These cores are practically trapped in false vacua, rendering their detection by outside observers impossible. Based on massive parallel computations and theoretical investigations, we show that SMDEOs at the centres of spiral galaxies that are surrounded by massive rotating torii of normal matter may serve as powerful sources for gravitational waves carrying away roughly 1042 erg/s. Due to the extensive cooling by GWs, the SMDEO-Torus systems undergo glitching, through which both rotational and gravitational energies are abruptly ejected into the ambient media, during which the topologies of the embedding spacetimes change from curved into flatter ones, thereby triggering a burst gravitational energy of order 1059 erg. Also, the effects of glitches found to alter the force balance of objects in the Lagrangian-L1 region between the central SMDEO-Torus system and the bulge, enforcing the enclosed objects to develop violent motions, that may explain the origin of the rotational curve irregularities observed in the innermost part of spiral galaxies. Our study shows that the generated GWs at the centres of galaxies, which traverse billions of objects during their outward propagations throughout the entire galaxy, lose energy due to repeatedly squeezing and stretching the objects. Here, we find that these interactions may serve as damping processes that give rise to the formation of collective forces f∝m(r)/r, that point outward, endowing the objects with the observed flat rotation curves. Our approach predicts a correlation between the baryonic mass and the rotation velocities in galaxies, which is in line with the Tully-Fisher relation. The here-presented self-consistent approach explains nicely the observed rotation curves without invoking dark matter or modifying Newtonian gravitation in the low-field approximation. 展开更多
关键词 General Relativity: Black holes Neutron Stars Quantum Fields: QCD Condensed Matter INCOMPRESSIBILITY SUPERFLUIDITY Cosmology: Galaxy formation Spiral Galaxies Dark Matter Rotation Curves
下载PDF
滨海深厚填石区超长大直径灌注桩施工技术研究
18
作者 葛瑛芳 崔佳 +1 位作者 何华军 张念 《施工技术(中英文)》 CAS 2024年第19期46-50,57,共6页
填海造陆区常存在含量高、粒径大的深厚填石层,给长大直径灌注桩施工带来技术难题。某工程填石层厚17.3m,采用桩径1.5m、最大桩长88m的灌注桩施工,经研究采用“冲击钻+旋挖钻”接力成孔技术及旋挖钻机填石层防卡钻装置。通过正交试验,... 填海造陆区常存在含量高、粒径大的深厚填石层,给长大直径灌注桩施工带来技术难题。某工程填石层厚17.3m,采用桩径1.5m、最大桩长88m的灌注桩施工,经研究采用“冲击钻+旋挖钻”接力成孔技术及旋挖钻机填石层防卡钻装置。通过正交试验,确定泥浆调配关键原料配合比和CMC护壁泥浆最佳质量配合比。优选矿物掺合料、外加剂,确定了混凝土最优配合比,提高混凝土耐久性、工作性、保塑性。 展开更多
关键词 桩基础 填海造陆区 填石层 成孔 正交试验 配合比
下载PDF
水敏性复杂地层深孔绳索取心钻进工艺研究与应用 被引量:1
19
作者 李振风 《地质装备》 2024年第1期43-48,共6页
宝山矿区地质构造较复杂,存在多个断裂破碎带,地层软硬互层交替,炭质页岩厚度大,遇水膨胀,钻孔缩径严重,钻进过程中易发生粘附卡钻、坍塌及埋钻等事故,属于典型的水敏性地层。针对该类地层在钻进过程中出现的这些问题,通过优化钻孔结构... 宝山矿区地质构造较复杂,存在多个断裂破碎带,地层软硬互层交替,炭质页岩厚度大,遇水膨胀,钻孔缩径严重,钻进过程中易发生粘附卡钻、坍塌及埋钻等事故,属于典型的水敏性地层。针对该类地层在钻进过程中出现的这些问题,通过优化钻孔结构、合理钻具级配,采用金刚石绳索取心钻进工艺和低固相钻井液护壁技术,适当控制回次进尺长度和回次进尺时间等措施,保证了钻孔孔壁的稳定性及工程安全,有效地解决了水敏性地层钻进中出现的问题,加快了施工进度,取得了较好的钻进效果,使项目得以顺利完成。本次钻探施工完成了钻探进尺9500余米,达到了地质找矿目的,取得了较好的经济和社会效益。此外,希望适用于该矿区的钻进工艺方法对其他相似水敏性复杂地层的钻探施工具有一定的参考意义。 展开更多
关键词 水敏性地层 低固相冲洗液 粘附卡钻 钻进工艺 钻具组合
下载PDF
复杂地层深孔钻探孔内事故处理与预防研究分析
20
作者 刘虹志 《世界有色金属》 2024年第2期223-225,共3页
随着对矿产资源需求的增加,矿产资源勘探逐渐向更深更复杂的地层发展。复杂地层深部钻探存在许多难点,孔内事故预处理是其中的重要关键技术之一,为降低深孔钻探孔内事故发生率,在施工过程中做好事故预防,本文分析常见深孔孔内事故特点,... 随着对矿产资源需求的增加,矿产资源勘探逐渐向更深更复杂的地层发展。复杂地层深部钻探存在许多难点,孔内事故预处理是其中的重要关键技术之一,为降低深孔钻探孔内事故发生率,在施工过程中做好事故预防,本文分析常见深孔孔内事故特点,针对坍塌卡钻、压差/粘吸卡钻和缩径卡钻三种情况进行了形成原因、卡点原因及事故处理应对措施,重点分析了井漏和坍塌两重孔内事故,以及孔内事故的预防措施。 展开更多
关键词 复杂地层 深部钻探 孔内事故 处理预防
下载PDF
上一页 1 2 27 下一页 到第
使用帮助 返回顶部