软土层埋深变化对地铁车站结构地震反应的影响规律研究
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摘要
软土侧向大变形将是造成地铁车站结构严重震害的主要因素。为了明确软土层埋深对地铁车站结构地震反应的影响规律,对常见的两层三跨岛式地铁车站结构侧向和底部地基中存在不同埋深软土层时5种软场地和1个一般场地条件下地铁车站结构的地震反应进行了数值模拟分析。计算中采用自行建立的软土记忆型黏塑性动力本构模型模拟软土的动力非线性特性,混凝土的动力特性采用黏塑性动力损伤模型。给出了软土层不同埋深对地铁车站结构的加速度反应、侧向摆动位移反应和应力反应的影响规律,为提高软土地基上城市地铁车站结构的抗震性能及其抗震设计方法提供了依据。
The large lateral displacement of soft soil layer is the main factor to cause the severe earthquake damage of subway stations. To confirm how the depth of soft soil layer affects the earthquake responses of subway stations, the finite-element method is used to model the dynamic interaction system of soil-subway station when five soft sites and one general site are used as the foundation of subway station respectively. The nonlinear dynamic properties of soft soils are modeled by the dynamic visco-plastic memorial nested yield surface model developed by the authors. The dynamic viscous-plastic damaged model is used to model the characteristics of concrete under cyclic loadings. The acceleration response, displacement response and stress response of subway stations lying in different soft sites are compared with those corresponding responses of subway stations lying in the general site. Many important results are given in this paper and the research achievements can be used in the seismic design of subway stations built in soft soil layers.
The large lateral displacement of soft soil layer is the main factor to cause the severe earthquake damage of subway stations. To confirm how the depth of soft soil layer affects the earthquake responses of subway stations, the finite-element method is used to model the dynamic interaction system of soil-subway station when five soft sites and one general site are used as the foundation of subway station respectively. The nonlinear dynamic properties of soft soils are modeled by the dynamic visco-plastic memorial nested yield surface model developed by the authors. The dynamic viscous-plastic damaged model is used to model the characteristics of concrete under cyclic loadings. The acceleration response, displacement response and stress response of subway stations lying in different soft sites are compared with those corresponding responses of subway stations lying in the general site. Many important results are given in this paper and the research achievements can be used in the seismic design of subway stations built in soft soil layers.
引文
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[2]UENISHI Koji,SAKURAI Shunsuke.Characteristic of the vertical seismic waves associated with the1995Hyogo-Nanbu(KOBE),Japan earthquake estimated from the failure of the Dakai underground station[J].Earthquake Engineering and Structural Dynamics,2000,29(6):813–821.
[3]IIDA H,HIROTO T,YOSHIDA N,et al.Damage to Dakai subway station[J].Soils and Foundations,1996:283–300.
[4]白冰,周健.软土地层隧道抗震稳定分析[J].佛山科学技术学院学报(自然科学版),2001,19(1):39–44.(BAI Bing,ZHOU Jian.The earthquake resistance stability analysis of tunnels surrounded by soft soil[J].Journal of Foshan University(Natural Science),2001,19(1):39–44.(in Chinese))
[5]姜忻良,宋丽梅.软土地层中地下隧道结构地震反应分析[J].地震工程与工程振动,1999,19(3):65–69.(JIANG Xin-liang,SONG Li-mei.Seismic response analysis of underground tunnel in soft soil[J].Earthquake Engineering and Engineering Vibration,1999,19(3):65–69.(in Chinese))
[6]郑永来,刘曙光,杨林德,等.软土中地铁区间隧道抗震设计研究[J].地下空间,2003,23(2):111–118.(ZHEN Yong-lai,LIU Shu-guang,YANG Lin-de,et al.A study on seismic design of subway tunnel insoft clay[J].UndergroundSpace,2003,23(2):111–118.(in Chinese))
[7]庄海洋,陈国兴,朱定华.土体动力黏塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报,2006,28(10):1267–1272.(ZHUANG Hai-yang,CHEN Guo-xing,ZHU Ding-hua.The dynamic visco-plastic memorial nested yield surface model of soil and its verification[J].Chinese Journal of Geotechnical Engineering,2006,28(10):1267–1272.(in Chinese))
[8]LEE Jeeho,FENVES Gregory L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(8):892–900.
[9]LUBLINER J,OLIVER J,OLLER S,et al.A plastic-damage model for concrete[J].International Journal of Solids and Structures,1989,25(3):299–326.
[10]程建军,严三保,蒋建平,等.南京地铁南北线主要工程地震问题认识与评价[J].地球科学与环境学报,2004,26(1):46–51.(CHEN Jian-jun,YAN San-bao,JIANG Jian-ping,et al.Assessment on the main engineering geological problems in the south-north line of Nanjing metro[J].Journal of Earth Sciences and Environme,2004,26(1):46–51.(in Chinese))
[11]楼梦麟,王文剑,朱彤,等.土–结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30–16.(LOU Meng-lin,WANG Wen-jian,ZHU Tong,et al.Soil lateral boundary effect in shaking table model test of soil-structure system[J].Earthquake Engineering and Engineering Vibration,2000,20(4):30–36.(in Chinese))
[12]陈跃庆,吕西林,黄炜.结构–地基相互作用振动台试验中土体边界条件的模拟方法[J].结构工程师,2000(3):20–30.(CHEN Yue-qing,LüXi-lin,HUANG Wei.Simulation method of soil boundary condition in shaking table tests of soil-structure interaction[J].Structural Engineers,2000(3):20–30.(in Chinese))
[13]庄海洋.土–地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.(ZHUANG Hai-yang.Study on nonlinear dynamic soil-underground structure interaction and its large-size shaking table test[D].Nanjing:Nanjing University of Technology,2006.(in Chinese))
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