基底脱空条件下交叉隧道动力放大效应
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摘要
对于交叉隧道这一结构形式,下穿隧道的存在会使得上跨隧道交叉段结构在列车荷载作用下动力响应大于非交叉段。依托新建京张草帽山交叉隧道工程,采用现场测试的手段对交叉隧道动力放大效应进行了验证,基于有限差分法建立三维仿真模型,对基底脱空条件下交叉隧道动力放大效应开展研究,并分析隧道净距、围岩级别对加速度放大系数的影响。结果表明:交叉段各特征点动力放大效果由大至小依次为隧底、拱腰和拱顶;基底脱空会加剧交叉段动力放大效应;随着隧道净距减小和围岩级别降低,交叉点动力放大效应会有所增强,基底脱空时加速度放大系数相比于基底完好时受到隧道净距的影响更为显著。并考虑交叉隧道动力放大效应,对交叉隧道设计、施工及后续运营提出了一些建议。
In crossing tunnel,the dynamic response of existing tunnel in the cross section is larger than that of normal section because of the underpass tunnel. Relied on the Hat Mountain crossing tunnel project of Beijing to Zhangjiakou railway,the field monitoring was used to verify the dynamic amplification effect in crossing tunnel.Based on the finite difference method,a three-dimensional simulation model was established to study the dynamic amplification effect of the crossing tunnel with base voids,and the influence of clearance distance and surrounding rock class on acceleration amplification factor was analyzed. The results show that the dynamic amplification effect of each characteristic point in the cross section is in the order of tunnel bottom,haunch and vault from large to small; The base voids will aggravate the dynamic amplification effect in crossing tunnel; With the decrease of clearance distance and surrounding rock class,the dynamic amplification effect in crossing tunnel will be enhanced,the acceleration amplification factor of tunnel with base voids is more significantly affected by clearance distance than the tunnel with intact base. Some suggestions on design,construction and subsequent operation are proposed considering the dynamic magnification effect of crossing tunnels.
In crossing tunnel,the dynamic response of existing tunnel in the cross section is larger than that of normal section because of the underpass tunnel. Relied on the Hat Mountain crossing tunnel project of Beijing to Zhangjiakou railway,the field monitoring was used to verify the dynamic amplification effect in crossing tunnel.Based on the finite difference method,a three-dimensional simulation model was established to study the dynamic amplification effect of the crossing tunnel with base voids,and the influence of clearance distance and surrounding rock class on acceleration amplification factor was analyzed. The results show that the dynamic amplification effect of each characteristic point in the cross section is in the order of tunnel bottom,haunch and vault from large to small; The base voids will aggravate the dynamic amplification effect in crossing tunnel; With the decrease of clearance distance and surrounding rock class,the dynamic amplification effect in crossing tunnel will be enhanced,the acceleration amplification factor of tunnel with base voids is more significantly affected by clearance distance than the tunnel with intact base. Some suggestions on design,construction and subsequent operation are proposed considering the dynamic magnification effect of crossing tunnels.
引文
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14 朱利明,苗宁宁,吴志强,等.地铁运行引起的南京鼓楼振动响应分析[J].科学技术与工程,2017,17(13):254-259Zhu Liming,Miao Ningning,Wu Zhiqiang,et al. Dynamic response analysis of nanjing drum tower under the situation of metro train running[J]. Science Technology and Engineering,2017,17(13):254-259
15 邹文浩,张梅,刘艳青,等. 30 t轴重下重载铁路隧道基底结构的应力分布及动力响应[J].中国铁道科学,2016,37(5):50-57Zou Wenhao,Zhang Mei,Liu Yanqing,et al. Stress distribution and dynamic response of base structure for heavy haul railway tunnel under 30 t axle load[J]. China Railway Science,2016,37(5):50-57
2 Feng L,Yi X,Zhu D,et al. Damage detection of metro tunnel structure through transmissibility function and cross correlation analysis using local excitation and measurement[J]. Mechanical Systems and Signal Processing,2015,60-61:59-74
3 丁祖德,彭立敏,黄娟,等.基底脱空条件下铁路隧道行车安全性分析[J].铁道学报,2012,34(9):104-110Ding Zude,Peng Limin,Huang Juan,et al. Running safety in railway tunnel with base voids[J]. Journal of Railway Society,2012,34(9):104-110
4 Wang W J,Guo H M,Du X,et al. Investigation on the damage mechanism and prevention of heavy-haul railway rail[J]. Engineering Failure Analysis,2013,35(26):206-218
5 邹文浩,付兵先,马伟斌.朔黄铁路隧道基底结构病害分析[J].铁道建筑,2017(4):68-71Zou Wenhao,Fu Bingxian,Ma Weibin. Analysis on the disease of the basement structure of the Shuohuang railway tunnel[J]. Railway Building,2017(4):68-71
6 徐新利. 30 t轴重重载列车作用下隧底脱空对基底结构受力的影响[J].铁道建筑,2015(4):44-49Xu Xinli. Influence of separation from tunnel's bottom on bearing capacity of base structure under train loading of 30 t axle load[J]. Railway Building,2015(4):44-49
7 陈卫军,张璞.列车动载作用下交叠隧道动力响应数值模拟[J].岩土力学,2002,23(6):770-774Chen Weijun,Zhang Pu. Numerical simulation of dynamic response of overlap tunnels in close proximity due to train's vibrating load[J].Rock and Soil Mechanics,2002,23(6):770-774
8 叶飞,丁文其,王国波,等.列车移动荷载对下穿公路隧道稳定性影响研究[J].岩土力学,2008,29(2):549-552Ye Fei,Ding Wenqi,Wang Guobo,et al. Influence of moving train load on stability of underlying highway tunnel[J]. Rock and Soil Mechanics,2008,29(2):549-552
9 康立鹏.高速列车荷载作用下交叉隧道动力响应特性及影响分区研究[D].长沙:中南大学,2013Kang Lipeng. Study on the dynamic response and influence zone of high-speed train loading force on crossing high-speed railway tunnel[D]. Changsha:Central South University,2013
10 于鹤然,周晓军.高速列车动荷载作用下立体交叉铁路隧道动力响应研究[J].铁道学报,2015,37(6):103-111Yu Heran,Zhou Xiaojun. Study on dynamic response of grade-separated railway tunnels under high-speed train induced dynamic load[J]. Journal of the China Railway Society,2015,37(6):103-111
11 刘强,施成华,彭立敏,等.高速列车振动荷载下立体交叉隧道结构动力响应分析[J].合肥工业大学学报(自然科学版),2013,36(9):1082-1087Liu Qiang,Shi Chenghua,Peng Limin,et al. Analysis of dynamic response of crossing tunnel under high-speed train vibratory load[J]. Journal of Hefei University of Technology,2013,36(9):1082-1087
12 仇文革.地下工程近接施工力学原理与对策的研究[D].成都:西南交通大学,2003Qiu Wenge. The study on mechanics principle and counter-measure of approaching excavation in underground works[D]. Chengdu:Southwest Jiaotong University,2003
13 朱正国,杨利海,王晓男.交叉隧道耦合动荷载动力响应及安全分析[J].铁道工程学报,2018,35(3):63-68Zhu Zhengguo,Yang Lihai,Wang Xiaonan. Analysis of dynamic response and security of crossing tunnel based on coupled dynamic load[J]. Journal of Railway Engineering Society,2018,35(3):63-68
14 朱利明,苗宁宁,吴志强,等.地铁运行引起的南京鼓楼振动响应分析[J].科学技术与工程,2017,17(13):254-259Zhu Liming,Miao Ningning,Wu Zhiqiang,et al. Dynamic response analysis of nanjing drum tower under the situation of metro train running[J]. Science Technology and Engineering,2017,17(13):254-259
15 邹文浩,张梅,刘艳青,等. 30 t轴重下重载铁路隧道基底结构的应力分布及动力响应[J].中国铁道科学,2016,37(5):50-57Zou Wenhao,Zhang Mei,Liu Yanqing,et al. Stress distribution and dynamic response of base structure for heavy haul railway tunnel under 30 t axle load[J]. China Railway Science,2016,37(5):50-57
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