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Experimental study on dynamic load magnification factor for ballastless track-subgrade of high-speed railway 被引量:6
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作者 Renpeng Chen Xing Zhao +2 位作者 Zuozhou Wang Hongguang Jiang Xuecheng Bian 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2013年第4期306-311,共6页
The magnitude of dynamic load produced by high-speed trains depends on many factors,of which train speed is the most critical one.However,it is quite difficult to determine the effect of train speed on dynamic load us... The magnitude of dynamic load produced by high-speed trains depends on many factors,of which train speed is the most critical one.However,it is quite difficult to determine the effect of train speed on dynamic load using the theoretical methods due to the complexity of the interaction between vehicle and track-subgrade.Thus large-scale model test has gradually become an important approach for studying dynamic responses of ballastless track-subgrade of high-speed railway.In this study,a full-scale model of ballastless track-subgrade was constructed in accordance with the design and construction standards for Shanghai-Nanjing intercity high-speed railway line firstly.Then,the dynamic strain of slab and the dynamic earth pressure of subgrade were measured by conducting single wheel axle excitation test.In addition,the relationship between the dynamic load magnification factor(DLF) and the train speed was obtained.Finally,the DLF of track-subgrade under different train speeds was proposed,similar to that given by German Railway Standard. 展开更多
关键词 high-speed railway Dynamic load magnification factor(DLF) Train speed Ballastless track-subgrade
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Accumulative deformation in railway track induced by high-speed traffic loading of the trains 被引量:18
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作者 Bian Xuecheng Jiang Hongguang Chen Yunmin 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2010年第3期319-326,共8页
Prediction and control of the permanent settlement of a track caused by traffic loading from trains is crucial to high-speed railway design and maintenance. In this study, a unified prediction model of accumulative de... Prediction and control of the permanent settlement of a track caused by traffic loading from trains is crucial to high-speed railway design and maintenance. In this study, a unified prediction model of accumulative deformation of geomaterials used in railway construction subjected to cyclic loadings is introduced and calibrated using physical model testing. Based on this versatile model, a calculation approach to determine the track structure settlement under repeated loadings caused by the movement of the wheel axle of the train is proposed. Regression analysis on the physical model testing is adopted to determine the parameters involved in the computational approach. Comparison of model test data and computed results shows that the parameters obtained from the back-analysis are consistent throughout the various testing conditions, and the proposed calculation approach is capable of satisfactorily predicting the accumulative settlement of the railway roadbed and subgrade soil for various axle loads and loading cycles. A case study of a high-speed railway is performed to demonstrate the feasibility of the proposed approach in realistic engineering applications. The computation results from the settlement development of a roadbed and subgrade soil are presented and discussed. 展开更多
关键词 cyclic loading AGGREGATE clay accumulative settlement high-speed railway
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Model tests on XCC-piled embankment under dynamic train load of high-speed railways 被引量:6
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作者 Niu Tingting Liu Hanlong +1 位作者 Ding Xuanming Zheng Changjie 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2018年第3期581-594,共14页
Piled embankments,which offer many advantages,are increasingly popular in construction of high-speed railways in China.Although the performance of piled embankment under static loading is well-known,the behavior under... Piled embankments,which offer many advantages,are increasingly popular in construction of high-speed railways in China.Although the performance of piled embankment under static loading is well-known,the behavior under the dynamic train load of a high-speed railway is not yet understood.In light of this,a heavily instrumented piled embankment model was set up,and a model test was carried out,in which a servo-hydraulic actuator outputting M-shaped waves was adopted to simulate the process of a running train.Earth pressure,settlement,strain in the geogrid and pile and excess pore water pressure were measured.The results show that the soil arching height under the dynamic train load of a high-speed railway is shorter than under static loading.The growth trend for accumulated settlement slowed down after long-term vibration although there was still a tendency for it to increase.Accumulated geogrid strain has an increasing tendency after long-term vibration.The closer the embankment edge,the greater the geogrid strain over the subsoil.Strains in the pile were smaller under dynamic train loads,and their distribution was different from that under static loading.At the same elevation,excess pore water pressure under the track slab was greater than that under the embankment shoulder. 展开更多
关键词 piled embankment model test dynamic train load of high-speed railways XCC-pile M-shaped wave
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Theoretical research and experimental validation of quasi-static load spectra on bogie frame structures of high-speed trains 被引量:15
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作者 Ning Zhu Shou-Guang Sun +1 位作者 Qiang Li Hua Zou 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2014年第6期901-909,共9页
One of the major problems in structural fatigue life analysis is establishing structural load spectra under actual operating conditions.This study conducts theoretical research and experimental validation of quasi-sta... One of the major problems in structural fatigue life analysis is establishing structural load spectra under actual operating conditions.This study conducts theoretical research and experimental validation of quasi-static load spectra on bogie frame structures of high-speed trains.The quasistatic load series that corresponds to quasi-static deformation modes are identified according to the structural form and bearing conditions of high-speed train bogie frames.Moreover,a force-measuring frame is designed and manufactured based on the quasi-static load series.The load decoupling model of the quasi-static load series is then established via calibration tests.Quasi-static load–time histories,together with online tests and decoupling analysis,are obtained for the intermediate range of the Beijing—Shanghai dedicated passenger line.The damage consistency calibration of the quasi-static discrete load spectra is performed according to a damage consistency criterion and a genetic algorithm.The calibrated damage that corresponds with the quasi-static discrete load spectra satisfies the safety requirements of bogie frames. 展开更多
关键词 load spectra QUASI-STATIC Bogie frame CALIBRATION high-speed train
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Study on the subgrade deformation under high-speed train loading and water–soil interaction
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作者 Jian Han Guo-Tang Zhao +1 位作者 Xiao-Zhen Sheng Xue-Song Jin 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2016年第2期233-243,共11页
It is important to study the subgrade characteristics of high-speed railways in consideration of the water–soil coupling dynamic problem,especially when high-speed trains operate in rainy regions.This study develops ... It is important to study the subgrade characteristics of high-speed railways in consideration of the water–soil coupling dynamic problem,especially when high-speed trains operate in rainy regions.This study develops a nonlinear water–soil interaction dynamic model of slab track coupling with subgrade under high-speed train loading based on vehicle–track coupling dynamics.By using this model,the basic dynamic characteristics,including water–soil interaction and without water induced by the high-speed train loading,are studied.The main factors-the permeability coefficien and the porosity-influencin the subgrade deformation are investigated.The developed model can characterize the soil dynamic behaviour more realistically,especially when considering the influenc of water-rich soil. 展开更多
关键词 Water–soil interaction high-speed train loading Finite difference method Subgrade deformation Permeability coefficien Porosity
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Soldiers' load carriage performance in high mountains: a physiological study 被引量:2
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作者 Tirthankar Chatterjee Debojyoti Bhattacharyya +3 位作者 Anilendu Pramanik Madhusudan Pal Deepti Majumdar Dhurjati Majumdar 《Military Medical Research》 SCIE CAS 2017年第3期132-140,共9页
Background: The present study was designed to evaluate load carriage performance at extremely high altitudes with different loads and walking speeds in terms of physiological evaluation. The degree of maximum oxygen c... Background: The present study was designed to evaluate load carriage performance at extremely high altitudes with different loads and walking speeds in terms of physiological evaluation. The degree of maximum oxygen consumption changes at high altitudes was also examined.Methods: Twelve Indian Army soldiers were acclimatized at altitudes of 3,505 m and 4,300 m. They walked for 10 minutes on a motorized treadmill at 2.5km/h and 3.5km/h speeds during carrying no loads and three magnitudes of load(10.7kg, 21.4kg, 30kg) at both altitudes. Physiological parameters such as oxygen consumption, energy expenditure, heart rate, and ventilation were recorded for each breath using a gas analyzer. The rating of perceived exertion was also noted after each load carriage session. Maximal oxygen consumption(VO2max) was measured at sea level and the two high altitudes, and respective relative workloads(% of VO2max) were calculated from oxygen consumption. Repeated measure ANOVA was applied to reveal the significant effects of the independent variables.Results: The participants had significant reductions in VO2 max with rising altitude. Marked increases in almost all physiological parameters were observed with increasing load, altitude, and speed. The soldiers expressed heavy perceived exertion levels with higher loads at 3.5km/h at the two high altitudes.Conclusions: Considering the physiological responses, expressions of perceived exertion and changes in relative work load at both of the high altitudes. Indian soldiers are advised to walk slowly with adequate rest in between their schedules and to carry not more than 32% of their body weight. 展开更多
关键词 load carriage high altitude Walking speed Physiological responses
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Research on dynamic characteristics of high speed milling force based on discontinuous functions
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作者 С.В.Биленко П.А.Саблин +1 位作者 Чжан Дань 《黑龙江科技大学学报》 CAS 2015年第1期75-81,共7页
This paper begins with a consideration of the influence of feed per revolution upon the depth of a cut and the impact of the machining method on the direction of tool pressure average and subsequent description of eff... This paper begins with a consideration of the influence of feed per revolution upon the depth of a cut and the impact of the machining method on the direction of tool pressure average and subsequent description of efficient cutting directions and the methods for load cell orientation. The paper goes further into the key conclusions concerning the dependences of the cutting depth at high-speed milling as in the case of discontinuous functions. It ends with recommendations offered for positioning of load cells for cut-up milling and cut-down milling. 展开更多
关键词 high-speed milling load cells TOOLS tool pressure depth of cut
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Investigation of insulation layer dynamic characteristics for high-speed railway
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作者 HongYe Yan GuoTang Zhao +3 位作者 DeGou Cai QianLi Zhang JianPing Yao AiJun Cheng 《Research in Cold and Arid Regions》 CSCD 2015年第4期430-437,共8页
Dynamic performance of insulation is one of the key parameters during the insulation application for high-speed railway subgrade. This paper conducted laboratory and field tests for the materials and dynamic load, esp... Dynamic performance of insulation is one of the key parameters during the insulation application for high-speed railway subgrade. This paper conducted laboratory and field tests for the materials and dynamic load, especially for thermal performance, elastic deformation, and accumulated deformation of insulation materials. Experiment results show that mechanical properties of insulation layer structure are stable, which satisfies the requirements of the high speed railway. 展开更多
关键词 high-speed railway insulation materials dynamic load elastic deformation accumulated deformation
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Structural analysis and design of frost resistance function for subgrade of high-speed railway ballasted track in cold regions 被引量:1
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作者 Qiang Luo WenQiang Lv +1 位作者 QingZhi Ye RuiGuo Zhang 《Research in Cold and Arid Regions》 CSCD 2015年第5期594-604,共11页
According to the technical characteristics of short fixed wheelbase of a high-speed carriage, a subgrade-track integrated space mechanical response analysis model is proposed for trains under the action ofbiaxial load... According to the technical characteristics of short fixed wheelbase of a high-speed carriage, a subgrade-track integrated space mechanical response analysis model is proposed for trains under the action ofbiaxial load after the comparison of the stress distribution characteristics of the ballast track subgrade bed structures for high-speed railway under the action of uniaxial load and biaxial load. The loading threshold value (high-cycle long-term dynamic strength) under the circum- stance where the cumulative deformation of subgrade structure gradually develops and finally reaches the convergent state, and its relationship with the foundation coefficient K30 were deduced, based on the characteristics of cumulative defor- mation evolution obtained from the unit structure filling model test under the action of cyclic loading. In view of structure stability and frost resistance requirements of the railway subgrade in cold regions, technical conditions to maintain good service performance of subgrade structure of high-speed railway ballasted track are discussed and analyzed. Study results show that the additive effect manifests itself obviously for railway train bogies under the action of biaxial load than uni- axial load, which has a significant dynamic effect on the subgrade bed bottom and a slight effect on the surface layer. Thus, the adoption of a biaxial load model in the design of a high-speed railway subgrade accurately reflects the vehicle load. Pursuant to the structure design principle, the design method of the subgrade structure of high-speed railway ballasted track is proposed to meet the technical requirements such as structural strength, bearing stiffness and high-cyclic and long-term stability. Technical indicators are obtained for the variation of thickness of the surface layer of reinforced sub- grade bed in the double-layer subgrade mode along with the change of K30 at the subgrade bed bottom. The double-layer structure mode of "closure on the upper layer and drainage on the lower layer" was proposed in order to meet the water- proofing and drainage requirements of the upper layer of the subgrade bed in cold regions. A dense-framework graded gravel filler with weak water permeability at a coefficient of 10 4 cm/s is used on the upper layer and the void-framework graded gravel filler at the water permeability coefficient of 10 2 cm/s is adopted on the lower layer. 展开更多
关键词 high-speed railway in cold regions subgrade structure biaxial load mode structural analysis design of frostresistance function
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千万吨级主井高速大载重提升技术研究与应用 被引量:1
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作者 李浩宇 徐长磊 +3 位作者 韩瑞军 施士虎 杜贵文 徐广译 《中国矿山工程》 2024年第1期53-59,共7页
以千万吨级“双超”矿山——思山岭铁矿主井提升系统建设为背景,从主井提升系统方案、竖井提升运行安全间隙研究、大型化提升技术装备应用、大型主井井塔布置等方面综合论述了主井提升系统参数确定所开展的研究工作以及设计建设采用的... 以千万吨级“双超”矿山——思山岭铁矿主井提升系统建设为背景,从主井提升系统方案、竖井提升运行安全间隙研究、大型化提升技术装备应用、大型主井井塔布置等方面综合论述了主井提升系统参数确定所开展的研究工作以及设计建设采用的新技术、新装备。思山岭铁矿主井提升系统的建设将对我国类似矿山竖井高速大载重提升系统的建设实施具有较强的标杆示范意义。 展开更多
关键词 千万吨级 高速 大载重 安全间隙 主井提升
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高速铁路无砟轨道车辆荷载传递特性研究 被引量:1
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作者 姚力 朱胜阳 +3 位作者 韦强文 王开云 王平 翟婉明 《铁道标准设计》 北大核心 2024年第10期69-74,82,共7页
为进一步探讨无砟轨道荷载设计参数取值,为我国时速400 km及以上高速铁路建设提供重要理论支撑,通过开展无砟轨道静力分析以及钢轨焊缝、车轮扁疤激励下车辆-轨道动力相互作用,揭示列车静、动力载荷特征及传递规律;同时根据轨道承载特... 为进一步探讨无砟轨道荷载设计参数取值,为我国时速400 km及以上高速铁路建设提供重要理论支撑,通过开展无砟轨道静力分析以及钢轨焊缝、车轮扁疤激励下车辆-轨道动力相互作用,揭示列车静、动力载荷特征及传递规律;同时根据轨道承载特点和无砟轨道设计原理,提出车辆竖向设计荷载取值建议。研究结果表明:(1)高速列车车轮扁疤和钢轨焊缝不平顺将造成显著的轮轨冲击,其轮载动载系数最大可达5.79,远高于现行规范取值;扣件系统对扁疤和焊缝不平顺引起的轮轨力高频成分衰减作用明显,扣件支反力的动载系数最大为2.64;(2)钢轨焊缝不平顺引起的轮轨冲击力随着车速提高以及焊缝不平顺幅值的增大而迅速增大,建议500 km/h及以下高速铁路的钢轨焊缝平直度标准取0.2 mm/m;(3)列车轮载通过扣件支反力作用于轨道板,从传递特性的角度来说,以扣件支反力作为轨道板竖向设计荷载更为合理,其动载系数可取3.0,且能满足400 km/h及以上高速铁路的行车需求。 展开更多
关键词 高速铁路 无砟轨道 车辆载荷传递特性 动载系数 扣件支反力
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OPTIMUM DESIGN OF HIGH-SPEED RAILWAY LOCOMOTIVE TRACTION GEAR 被引量:1
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作者 Li Lixing Wang Xiuqi +6 位作者 He Weidong Zhao Wenzhong Qian Yuanmei (Dalian Railway Institute) Liu Youmei Gui Linfang Xiao Peng Pan Xiaoming Xu Zongxiang (Zhuzhou Electric Locomotive Works ) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1996年第4期278-285,共2页
On the basis of deep investigation of locomotive traction gears manufactured at home and abroad , a variety of measures are putted forward to improve the driving load-bearing capacity and working life of our country&#... On the basis of deep investigation of locomotive traction gears manufactured at home and abroad , a variety of measures are putted forward to improve the driving load-bearing capacity and working life of our country's high-speed locomotive traction gears. The measures include the fol- lowing five aspects : optimally selecting the material and heat treatment process , optimally designing the tooth profile . reasonably choosing the manufacture accuracy and technique , optimally choosing the lubricant and the way of lubrication and seal , improving the dynamic feature of the gearing. In the respect of the tooth profile , a hob with optimal cutter angles is designed to make root thickness on the dangerous section as large as possible and the stress concentration as small as possible. Ad- dendum modification coefficient is optimized to minimize the maximum flash temperature in the course of meshing. Finally . finite element analysis method is used to calculate the deformation and the stress of teeth accurately. And on this basis , optimal profile correction and axial modification have been designed with regard to the start , continuious running and high speed travel of the loco- motive . 展开更多
关键词 high-speed gear Working life load-bearing capacity Optimum design
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高速跨介质入水多相流动与流固耦合特性研究综述 被引量:2
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作者 明付仁 王嘉捷 +2 位作者 刘文韬 刘祥聚 张阿漫 《空气动力学学报》 CSCD 北大核心 2024年第1期67-85,I0002,共20页
高速跨介质入水问题广泛存在于海洋工程、航空航天等领域,入水多相流动与流固耦合作用机理是该领域的研究热点,对于跨介质航行器的载荷预报、弹道稳定性评估、结构强度校核以及安全性设计等具有重要意义。本文围绕高速跨介质入水所涉及... 高速跨介质入水问题广泛存在于海洋工程、航空航天等领域,入水多相流动与流固耦合作用机理是该领域的研究热点,对于跨介质航行器的载荷预报、弹道稳定性评估、结构强度校核以及安全性设计等具有重要意义。本文围绕高速跨介质入水所涉及的基础关键力学问题,重点论述了高速跨介质多相流动与空泡演化、冲击载荷与降载方法、运动稳定性与流固耦合响应、流固耦合数值研究方法等方面的研究现状,并针对目前仍存在的问题提出了建议,旨在为高速跨介质入水的相关研究与设计等提供参考。 展开更多
关键词 高速入水 多相流动 冲击载荷与降载 结构响应 流固耦合
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高速列车突入复线隧道的横风效应分析
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作者 王磊 谭忠盛 +3 位作者 骆建军 李宇杰 李飞龙 尚素英 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第11期141-150,共10页
横风作用下运行环境不同导致高速列车气动特性发生突变,严重影响列车运行安全和乘客的舒适性。基于高速列车流场的可压缩、非定常特性,建立隧道-列车-横风三维数值模型,采用SST k-ω湍流模型进行求解,通过与动模型试验对比,验证了数值... 横风作用下运行环境不同导致高速列车气动特性发生突变,严重影响列车运行安全和乘客的舒适性。基于高速列车流场的可压缩、非定常特性,建立隧道-列车-横风三维数值模型,采用SST k-ω湍流模型进行求解,通过与动模型试验对比,验证了数值模拟的准确性,进一步分析横风对列车周围流场与表面压力分布的影响,得到了横风作用下列车气动荷载变化规律。研究结果表明:列车周围流场分布受横风影响显著,隧道外流场向列车背风侧偏移,并形成起始于隧道入口处的纵向涡旋,而隧道内列车背风侧涡旋消失,迎风侧形成延伸至入口处的垂向涡旋,并在列车驶入过程中隧道内涡旋结构逐渐消失。在列车驶入隧道前列车迎风面气动压力以正值为主,背风面气动压力以负值为主。当列车驶入隧道时列车表面压力发生剧烈变化,气动压力波动程度随列车驶入而明显减弱。气动荷载变化规律与风环境密切相关,无风时尾车横向力和升力变化幅值最大,而横风下头车横向力和升力变化幅值最大。此外,列车气动性能与编组位置密切相关,横风下头车横向力变化幅值分别是中车、尾车的4.8倍和15.4倍,头车升力变化幅值分别为中车、尾车的1.1倍和1.2倍,头车发生行车安全事故风险最高。研究成果可为类似情形下高速列车运行安全性评价和高铁隧道选线提供参考。 展开更多
关键词 高速列车 横风 隧道 气动荷载 流场
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高速注采储气库井套管螺纹密封性研究
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作者 宋巍 周岩 +2 位作者 吴艳 杨燕 叶盛军 《西南石油大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第3期170-178,共9页
套管螺纹密封性是影响周期性高速注采作业的储库气井安全性的关键因素,因此保证储气库井的密封性完整极其重要。需要重点研究储气库井注采过程中对其套管柱密封性的影响,特别是循环注采过程中产生的交变载荷对储气库套管柱特殊螺纹接头... 套管螺纹密封性是影响周期性高速注采作业的储库气井安全性的关键因素,因此保证储气库井的密封性完整极其重要。需要重点研究储气库井注采过程中对其套管柱密封性的影响,特别是循环注采过程中产生的交变载荷对储气库套管柱特殊螺纹接头密封结构性能的影响。基于有限元法理论,针对中国北部某储气库井所选用的特殊螺纹接头,结合储气库井实际工况和现场数据,建立套管接头螺纹有限元计算模型,研究了循环注采条件下,温度、注采压力、轴向载荷及点蚀对储气库套管螺纹密封状态的影响。结果表明,温度对套管螺纹接头的结构完整性和密封完整性影响较小,注采压力、轴向载荷和点蚀对其影响较大,需控制在一个较低值。研究可为储气库井套管柱密封失效判定及其套管柱设计提供参考。 展开更多
关键词 储气库井 特殊螺纹接头 套管密封性 高速注采 交变载荷
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地震和高铁共同作用下桩网复合地基振动特性
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作者 高广运 潘天舒 +1 位作者 耿建龙 陈少杰 《噪声与振动控制》 CSCD 北大核心 2024年第1期7-14,共8页
为研究地震和高铁列车荷载共同作用下桩网复合地基振动特性,通过建立轨道-路堤-桩网复合地基三维有限元计算模型,分别与实测数据和一维波动理论对比验证模型的正确性。通过对比不同荷载工况下地面位移和加速度时频振动曲线,分析地震和... 为研究地震和高铁列车荷载共同作用下桩网复合地基振动特性,通过建立轨道-路堤-桩网复合地基三维有限元计算模型,分别与实测数据和一维波动理论对比验证模型的正确性。通过对比不同荷载工况下地面位移和加速度时频振动曲线,分析地震和高铁两动载共同作用时不同车速下桩网复合地基时频振动特性,研究桩体模量对桩网复合地基减震效果的影响。研究表明,Hollister地震荷载和高铁荷载共同作用下,距轨道中心1 m处地面振动位移由地震荷载主导,地面振动加速度由列车荷载主导;20 Hz以下地面低频振动由高铁和地震荷载共同控制,地面高频振动主要由列车荷载控制。Lytle Creek地震荷载和高铁荷载共同作用下,桩网复合地基地面振动位移和加速度峰值均大于高铁荷载单独作用下的值;增加桩体模量对高铁荷载单独作用和两动载共同作用下桩网复合地基地面振动均有减振效果,但两动载共同作用下增加桩体模量对地面减振效果比高铁荷载单独作用下弱。 展开更多
关键词 振动与波 地震荷载 高铁荷载 桩网复合地基 桩体模量 地面振动
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地震-高铁荷载共同作用下桩网复合路基震动特性
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作者 高广运 吕明杰 +2 位作者 耿建龙 史文杰 陈少杰 《地震工程学报》 CSCD 北大核心 2024年第6期1279-1290,共12页
为研究地震和高铁荷载共同作用下桩网复合路基震动特性,建立地震和高铁荷载共同作用下轨道-路堤-桩网复合路基震动的三维有限元分析模型,研究地震荷载类型和列车车速对桩网复合路基震动加速度和位移的影响规律,提出不同地震荷载下的列... 为研究地震和高铁荷载共同作用下桩网复合路基震动特性,建立地震和高铁荷载共同作用下轨道-路堤-桩网复合路基震动的三维有限元分析模型,研究地震荷载类型和列车车速对桩网复合路基震动加速度和位移的影响规律,提出不同地震荷载下的列车运行建议。研究表明,Hollister地震与高铁荷载共同作用下,桩网复合路基地面震动加速度由两动载共同控制,震动位移主要由地震荷载控制,列车运行状态对地震动位移影响很小;Chi-Chi地震与高铁荷载共同作用下,地震动加速度主要由高铁荷载控制,地震动位移受地震荷载和列车荷载共同影响,地震发生时可先通过降低车速后停运列车有效减小地震动位移;Lytle Creek地震与高铁荷载共同作用下,地震动加速度主要由高铁荷载控制,地面震动位移受地震和列车荷载共同影响,且主要由列车荷载控制,地震发生时可通过降低列车车速有效减小地震动位移,以降低地震发生时列车脱轨的可能性。 展开更多
关键词 高速铁路 地震荷载 桩网复合路基 列车速度 震动响应
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考虑风速纵、横分量的列车气动载荷变化特性 被引量:1
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作者 于梦阁 李美香 +1 位作者 刘加利 戴志远 《西南交通大学学报》 EI CSCD 北大核心 2024年第1期39-45,共7页
为探索侧向环境风作用下列车气动载荷变化特性,对任意风向角下随车移动点处的风速纵、横分量进行建模,研究考虑风速纵、横分量的列车气动载荷计算方法,并分析在列车速度200~400 km/h、平均风速10~35 m/s及风向角30°~150°时的... 为探索侧向环境风作用下列车气动载荷变化特性,对任意风向角下随车移动点处的风速纵、横分量进行建模,研究考虑风速纵、横分量的列车气动载荷计算方法,并分析在列车速度200~400 km/h、平均风速10~35 m/s及风向角30°~150°时的列车气动载荷特性.研究发现:在不同风向角下,考虑风速横向分量后,高速列车气动载荷波动变大,作用于列车上的瞬时气动载荷极值增大;风速横向分量主要影响列车气动载荷的标准差,且影响程度与风向角有关;随着风向角接近临界风向角,风速横向分量对列车气动载荷标准差的影响逐渐变小,随着风向角远离临界风向角,风速横向分量对列车气动载荷标准差的影响逐渐变大;列车气动载荷的标准差/均值主要与侧偏角有关,且在风向角为30°及150°时较大,其次是风向角60°和120°,而在风向角90°时则较小. 展开更多
关键词 高速列车 随机风速 非定常气动载荷 风向角 标准差
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风向角对高速列车驶出隧道过程中气动效应的影响
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作者 王磊 李宇杰 +2 位作者 张传凯 骆建军 叶子剑 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第1期419-430,共12页
为研究风向角对驶出隧道过程中高速列车气动效应的影响,以某型高速动车组列车为研究对象,采用数值模拟方法对隧道内气动压力、列车风风速、流场分布及列车气动荷载进行分析。通过与动模型试验结果进出对比,验证数值模拟方法的准确性。... 为研究风向角对驶出隧道过程中高速列车气动效应的影响,以某型高速动车组列车为研究对象,采用数值模拟方法对隧道内气动压力、列车风风速、流场分布及列车气动荷载进行分析。通过与动模型试验结果进出对比,验证数值模拟方法的准确性。研究结果表明:隧道壁面气动压力峰值及变化幅值最大值出现在隧道内部,且出现位置到隧道出口距离与风向角有关;背风侧气动压力受风向角影响更大,气动压力变化幅值随风向角增大呈现先减小后增大再减小的趋势;出口处列车风风速随风向角增大基本呈现先增大后减小的趋势,30°风向角时列车风风速最大,但迎、背风侧列车风风速峰值出现时刻不同;随着风向角增大,流场分布不对称性增强,列车绕流特性由流线型绕流逐渐过渡到钝体绕流,流动分离点到头车鼻尖的距离呈现先增大后减小最后再增大的变化规律,隧道内流动结构愈加复杂;气动横向力、升力变化幅值随风向角增加呈现先增后减趋势,头车横向力系数最大变化幅值分别是中车、尾车的2.4倍和2.6倍,升力系数最大变化幅值分别是中车、尾车的1.1倍和1.5倍,故保证头车安全是控制整车运行安全的关键;侧风下高速列车驶出隧道情形下的最不利风向角为30°,此时头车发生列车事故风险最高。 展开更多
关键词 高速列车 风向角 侧风 气动荷载
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高铁列车荷载作用下桩-土复合地基及近接地铁隧道的动力响应模拟研究
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作者 李团社 《城市轨道交通研究》 北大核心 2024年第6期100-104,110,共6页
[目的]作为典型的振动荷载,高铁列车运行引起的振动荷载会诱发桩-土地基及附近结构产生动力响应,有必要对桩-土复合地基及近接隧道的动力响应特性进行研究。[方法]基于西安地铁14号线下穿大西高速铁路特大桥工程,采用模型试验和数值模... [目的]作为典型的振动荷载,高铁列车运行引起的振动荷载会诱发桩-土地基及附近结构产生动力响应,有必要对桩-土复合地基及近接隧道的动力响应特性进行研究。[方法]基于西安地铁14号线下穿大西高速铁路特大桥工程,采用模型试验和数值模拟相结合的方法,以峰值振动加速度、峰值振动速度和峰值振动位移作为动力响应评价指标,研究了列车移动荷载作用下桩-土复合地基及近接隧道的动力响应特性。[结果及结论]研究结果表明,当施加列车荷载时,地基内部的动力响应指标均随着埋深的增加而衰减,但存在近接隧道时,动力响应指标值显著增加,且在隧道埋深处衰减明显。随着距桩基中心距离的增加,隧道埋深处的桩-隧之间地基的各动力响应指标从“波浪形”分布变为单调递减分布。根据峰值振动速度的控制阈值,近接隧道埋深处距桩基础中心水平3.6 m范围内的地基处于危险影响区,必须采用减振措施;3.6~11.4 m范围内的地基处于强影响区,建议采取减振措施;11.4 m以外的地基处于弱影响区,视结构的重要性决定是否需要采取减振措施。 展开更多
关键词 地铁隧道 高铁列车荷载 动力响应 控制阈值
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