高速列车振动下隧道周边砂土液化研究
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摘要
以广深港高速铁路狮子洋盾构隧道为背景,考虑流固耦合作用,通过FLAC3D软件对列车荷载引发的地层动力响应进行了数值模拟,分析了列车高速通过隧道时孔隙水压力和超孔压比的变化规律。计算中,采用车辆-轨道耦合模型得到列车轮轨激振力。采用循环活动性准则判别砂土液化。结果表明,高速列车荷载作用下,孔隙水压力增大,超孔压比峰值出现在地表,但其值很小,不会发生液化;两列列车交会通过隧道时,超孔压比近似对称分布,其最大值比单列列车通过情形略有增大。
Based on the program of Shiziyang shield tunnel of Guangshengang high speed railway,a fluid particle coupled model was established by FLAC3D to simulate the dynamic response of stratum induced by high speed train.The excitation loads of moving trains onto the track plate are obtained by train-track system model.The sand liquefaction is judged by the rule of cyclic mobility.The pore water pressure and excess pore water pressure ratio was analysed.Results show that the possibility of sand liquefaction is low due to low excess pore water pressure ratio,the peak value of which appeared near the landsurface.The excess pore water pressure ratio is asymmetricly distributed under the action when two trains meet,while the peak excess pore water pressure ratio is a little greater than that at the situation with one single train.
Based on the program of Shiziyang shield tunnel of Guangshengang high speed railway,a fluid particle coupled model was established by FLAC3D to simulate the dynamic response of stratum induced by high speed train.The excitation loads of moving trains onto the track plate are obtained by train-track system model.The sand liquefaction is judged by the rule of cyclic mobility.The pore water pressure and excess pore water pressure ratio was analysed.Results show that the possibility of sand liquefaction is low due to low excess pore water pressure ratio,the peak value of which appeared near the landsurface.The excess pore water pressure ratio is asymmetricly distributed under the action when two trains meet,while the peak excess pore water pressure ratio is a little greater than that at the situation with one single train.
引文
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[4]王秀英,刘维宁.列车振动作用下沉管地基砂土液化可能性研究[J].铁道学报,2004,26(1):96-100.(Wang Xiuying,Liu Weining.Study of the possibility ofsand liquefaction of the immersed tube tunnel undertrain vibratioin[J].Journal of the China Railway Socie-ty,2004,26(1):96-100.(in Chinese))
[5]周念清,唐益群,王建秀,等.饱和粘性土体中孔隙水压力对地铁振动荷载响应特征分析[J].岩土工程学报,2006,28(12):2149-2152.(Zhou Nianqing,Tang Yuqun,Wang Jianxiu,et al.Response character-istics of pore pressure in saturated soft clay to the metrovibration loading[J].Chinese Journal of GeotechnicalEngineering,2006,28(12):2 149-2 152.(in Chi-nese))
[6]杨坪,唐益群,周念清,等.车辆荷载作用下冲填土的孔压发展试验研究[J].地下空间与工程学报,2008,4(2):253-258.(Yang Ping,Tang Yiqun,Zhou Nian-qing,et al.Study on pore water pressure of hydraulic fillunder traffic loading[J].Chinese Journal of Under-ground Space and Engineering,2008,4(2):253-258.(in Chinese))
[7]赵建华,陈晓斌.动力排水固结软基处理模型试验研究[J].地下空间与工程学报,2009,5(1):60-66.(Zhao Jianhua,Chen Xiaobin.Model testing study ondynamic drainage consolidation method for soft soil foun-dation treatment[J].Chinese Journal of UndergroundSpace and Engineering,2009,5(1):60-66.(in Chi-nese))
[8]江美英,骆亚生,王瑞瑞,等.应力路径对饱和黄土孔压的影响研究[J].地下空间与工程学报,2010,6(3):498-502.(Jiang Meiying,Luo Yasheng,WangRuirui,et al.Influence of stress path on the pore pres-sure of saturated loess[J].Chinese Journal of Under-ground Space and Engineering,2010,6(3):498-502.(in Chinese))
[9]王艳丽,胡勇.饱和砂土动力特性的动三轴试验研究[J].地下空间与工程学报,2010,6(2):295-299.(Wang Yanli,Hu Yong.Dynamic triaxial testing studyon dynamic characteristics of saturated sands[J].Chi-nese Journal of Underground Space and Engineering,2010,6(2):295-299.(in Chinese))
[10]吕西林,任红梅,李培振.地震作用下可液化土的数值模拟与试验验证[J].建筑科学与工程学报,2009,26(4):1-6.(Lu Xilin,Ren Hongmei,Li Peizhen.Nu-merical simulation and liquefiable soil under test verifi-cation of seismic action[J].Journal of Architecture andCivil Engineering,2009,26(4):1-6.(in Chinese))
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