软土地基盾构隧道地震动力响应振动台模型试验研究
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摘要
历次发生的大震表明,软土地基会增大地震作用的破坏程度。以某软土地区地铁盾构隧道为原型进行振动台模型试验,重点分析隧道结构的动力响应特性及隧道与围岩的相互动力作用。试验分析表明:地震波在土体中的传播特性因隧道结构的存在而发生了改变,隧道的存在对其周围土体和地表的加速度峰值有一定的减小作用。隧道结构应变值在距离拱顶和拱底圆心角为±30°处相对于其他部位较大,这些部位易发生破坏。因此,在隧道结构设计中应适当提高这些部位的抗震措施。
All previous occurrence of strong earthquakes showed that soft soil will increase the damage degree of earthquake. A subway shield tunnel in soft soil area was used as a prototype for shaking table model test,the dynamic response characteristic of the tunnel structure and the dynamic interaction of the tunnel-surrounding rocks was analyzed. The results show that,propagation characteristics of seismic wave in the soil is changed due to the existence of the tunnel structure,and the tunnel structure results in the decrease of the seismic peaks of the surrounding rocks and earth surface. The damages are likely to occur at the places with central angles of ± 30° to the top or bottom of the tunnel structure,where the strains are larger than other places. Thus,seismic measures should be increased for the design of tunnel structure of these sections.
All previous occurrence of strong earthquakes showed that soft soil will increase the damage degree of earthquake. A subway shield tunnel in soft soil area was used as a prototype for shaking table model test,the dynamic response characteristic of the tunnel structure and the dynamic interaction of the tunnel-surrounding rocks was analyzed. The results show that,propagation characteristics of seismic wave in the soil is changed due to the existence of the tunnel structure,and the tunnel structure results in the decrease of the seismic peaks of the surrounding rocks and earth surface. The damages are likely to occur at the places with central angles of ± 30° to the top or bottom of the tunnel structure,where the strains are larger than other places. Thus,seismic measures should be increased for the design of tunnel structure of these sections.
引文
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2陈国兴,庄海洋,杜修力,等.土-地铁隧道动力相互作用的大型振动台模型试验研究-试验结果分析.地震工程与工程振动,2007;27(2):164-170Chen Guoxing,Zhuang Haiyang,Du Xiuli,et al.A large-scale shaking table test for dynamic soil-metro tunnel interaction:analysis of test results.Earthquake Engineering and Engineering Vibration,2007;27(2):164-170
3蒋树屏,文栋良,郑升宝.嘎隆拉隧道洞口段地震响应大型振动台模型试验研究.岩石力学与工程学报,2011;30(4):649-656Jiang Shuping,Wen Dongliang,Zheng Shengbao.Large-scale shaking table test for seismic response of Galongla tunnel.Chinese Journal of Rock Mechanics and Engineering,2011;30(4):649-656
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6蒋华.高烈度地震区公路隧道振动台模型试验方案设计及减震方法研究.重庆:重庆交通大学,2009Jiang Hua.A scheme of shaking table test and shock absorption measure study in tunnel of highway in seismic region with strong motion.Chongqing:Chongqing Jiaotong University,2009
7信春雷,高波,周佳媚,等.跨断层隧道抗减震措施性能振动台试验研究.岩土工程学报,2014;36(8):1414-1421Xin Chunlei,Gao Bo,Zhou Jiamei,et al.Shaking table tests on performances of anti-seismic and damping measures for fault-crossing tunnel structures.Chinese Journal of Geotechnical Engineering,2014;36(8):1414-1421
8皇民,刘马群,高波.隧道地震动力模型试验相似准则和参数设计.交通科技与经济,2011;64(2):64-66Huang Min,Liu Maqun,Gao Bo.Research of similar guidelines and parameters for tunnel seismic model test.Technology&Economy in Areas of Communication,2011;64(2):64-66
9 Hashash Y M A,Hook J J,Schmidt B,et al.Seismic design and analysis of underground structures.Oxford:Tunneling and Underground Space Technology,2001;16(4):247-293
10季倩倩,杨林德.地下铁道震害与震后修复措施.灾害学,2001;16(2):31-36Ji Qianqian,Yang Linde.Seismic damage and restoration measures of subway.Journal of Catastrophology,2001;16(2):31-36
2陈国兴,庄海洋,杜修力,等.土-地铁隧道动力相互作用的大型振动台模型试验研究-试验结果分析.地震工程与工程振动,2007;27(2):164-170Chen Guoxing,Zhuang Haiyang,Du Xiuli,et al.A large-scale shaking table test for dynamic soil-metro tunnel interaction:analysis of test results.Earthquake Engineering and Engineering Vibration,2007;27(2):164-170
3蒋树屏,文栋良,郑升宝.嘎隆拉隧道洞口段地震响应大型振动台模型试验研究.岩石力学与工程学报,2011;30(4):649-656Jiang Shuping,Wen Dongliang,Zheng Shengbao.Large-scale shaking table test for seismic response of Galongla tunnel.Chinese Journal of Rock Mechanics and Engineering,2011;30(4):649-656
4高峰,孙常新,谭绪凯,等.不同埋深隧道的地震响应振动台试验研究.岩土力学,2015;36(9):2517-2522Gao Feng,Sun Changxin,Tan Xukai,et al.Shaking table tests for seismic response of tunnels with different depths.Rock and Soil Mechanics,2015;36(9):2517-2522
5申玉生,高波,王峥峥,等.高烈度地震区山岭隧道模型试验研究.现代隧道技术,2008;45(5):38-42Shen Yusheng,Gao Bo,Wang Zhengzheng,et al.Study of mountain tunnels on high intensity earthquake zone with model test.Modern Tunneling Technology,2008;45(5):38-42
6蒋华.高烈度地震区公路隧道振动台模型试验方案设计及减震方法研究.重庆:重庆交通大学,2009Jiang Hua.A scheme of shaking table test and shock absorption measure study in tunnel of highway in seismic region with strong motion.Chongqing:Chongqing Jiaotong University,2009
7信春雷,高波,周佳媚,等.跨断层隧道抗减震措施性能振动台试验研究.岩土工程学报,2014;36(8):1414-1421Xin Chunlei,Gao Bo,Zhou Jiamei,et al.Shaking table tests on performances of anti-seismic and damping measures for fault-crossing tunnel structures.Chinese Journal of Geotechnical Engineering,2014;36(8):1414-1421
8皇民,刘马群,高波.隧道地震动力模型试验相似准则和参数设计.交通科技与经济,2011;64(2):64-66Huang Min,Liu Maqun,Gao Bo.Research of similar guidelines and parameters for tunnel seismic model test.Technology&Economy in Areas of Communication,2011;64(2):64-66
9 Hashash Y M A,Hook J J,Schmidt B,et al.Seismic design and analysis of underground structures.Oxford:Tunneling and Underground Space Technology,2001;16(4):247-293
10季倩倩,杨林德.地下铁道震害与震后修复措施.灾害学,2001;16(2):31-36Ji Qianqian,Yang Linde.Seismic damage and restoration measures of subway.Journal of Catastrophology,2001;16(2):31-36