跨越断层路堤减隔震措施研究
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摘要
为研究跨断层路堤的减隔震措施,基于Abaqus软件建立三维路堤数值模拟,研究断层错动过程中路堤在加和不加筏板基础两种工况的动力响应,并进一步讨论在加筏板基础情况下,筏板位置对路基减隔震效果的影响。研究结果表明:第一,合理放置筏板基础可阻断断层从上覆土层向路堤顶面的传递,使断层在路堤中的传播倾角变小,破裂带分散,起到耗散能量的作用,最后达到减小路面竖向位移的目的,起到减隔震的作用;第二,路堤高度的增加可以减小断层错动对路面变形的影响,使断层带上的路面变形曲率减小,增加路面的平稳性。
To study shock absorption and isolation measures for embankment crossing fault,three dimensional numerical simulation for embanment was established based on the software Abaqus,the dynamic response of the embankment with and without raft foundation in the course of fault movement has been gained,moreover,when the raft foundation was added,the influence of its location on shock absorption and isolation has been discussed.The result shows that the proper placement of raft foundation may cut off fault transferring from overlaying soil to embankment top,which plays a role of energy dissipation by reducing the propagation inclination of the fault in the embankment and breaking up the rupture zone,for the purpose of reducing vertical displacement of the pavement and then realizing shock absorption and isolation;the increase of embankment height could reduce effect of fault movement on pavement deformation,which reduces curvature of the deformation on faulted zone and improves stationarity of the pavement.
To study shock absorption and isolation measures for embankment crossing fault,three dimensional numerical simulation for embanment was established based on the software Abaqus,the dynamic response of the embankment with and without raft foundation in the course of fault movement has been gained,moreover,when the raft foundation was added,the influence of its location on shock absorption and isolation has been discussed.The result shows that the proper placement of raft foundation may cut off fault transferring from overlaying soil to embankment top,which plays a role of energy dissipation by reducing the propagation inclination of the fault in the embankment and breaking up the rupture zone,for the purpose of reducing vertical displacement of the pavement and then realizing shock absorption and isolation;the increase of embankment height could reduce effect of fault movement on pavement deformation,which reduces curvature of the deformation on faulted zone and improves stationarity of the pavement.
引文
[1]李小军.对近年大震展害现象与工程地震问题的思考明.国际地展动态,2000(l):26-31.
[2]ABAQUS Inc.ABAQUS V.6.10user’s manual[K].2010.
[3]Day SM.Three-dimensional,finite difference simulation of fault dynamics:rectangular faults with fixed rupture velocity[J].Bulleting of the Seismological Society of America,1982,72(3):705–727.
[4]Trifunac MD,Novikova EI.Duration of earthquake fault motion in California[J].Earthquake Engineering and Structural Dynamics,1995,24(6):781–799.
[5]李起彤.断层活动性定量评定之现状与展望[J].国际地震动态,1994(5):1-5.
[6]袁志东.活动断裂的公路工程危害研究[D].长安大学,2009.
[2]ABAQUS Inc.ABAQUS V.6.10user’s manual[K].2010.
[3]Day SM.Three-dimensional,finite difference simulation of fault dynamics:rectangular faults with fixed rupture velocity[J].Bulleting of the Seismological Society of America,1982,72(3):705–727.
[4]Trifunac MD,Novikova EI.Duration of earthquake fault motion in California[J].Earthquake Engineering and Structural Dynamics,1995,24(6):781–799.
[5]李起彤.断层活动性定量评定之现状与展望[J].国际地震动态,1994(5):1-5.
[6]袁志东.活动断裂的公路工程危害研究[D].长安大学,2009.
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