杭州钱塘江防洪堤抗震分析
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摘要
通过动力试验研究了杭州钱塘江防洪堤基的动力特性,并用原位和室内分析法判别了堤基液化的可能性,在有限元分析时,改进了工程上常用的排水有效应力动反应分析方法,在地震期间采用Biot动力固结方程进行动力分析,可以同时考虑地震期间孔压的上升及固结消散对防洪堤的抗震液化和稳定性进行分析。采用非线性成层地基反演技术,反演分析基岩地震加速度曲线,对堤坝地震反应进行分析。地震响应的各种结果对于了解今后防洪堤在地震期间的运行状态具有一定指导意义。
By the dynamic test,the dynamic properties of the silty sand of Hangzhou Qiangtang River flood protection levee are studied.The possibility of liquefaction is judged by the in-situ and laboratory tests.The liquefaction and dynamic stability are studied by adopting the Biot’s dynamic consolidation equation to do finite element analysis,which can consider the increasing as well as dissipating of pore water pressure during the earthquake.By the inverse analysis method,the acceleration at the basement rock obtained from free surface is inputted as seismic loading.The result will help us to understand the levee behavior during the earthquake intensity of 7 degree.
By the dynamic test,the dynamic properties of the silty sand of Hangzhou Qiangtang River flood protection levee are studied.The possibility of liquefaction is judged by the in-situ and laboratory tests.The liquefaction and dynamic stability are studied by adopting the Biot’s dynamic consolidation equation to do finite element analysis,which can consider the increasing as well as dissipating of pore water pressure during the earthquake.By the inverse analysis method,the acceleration at the basement rock obtained from free surface is inputted as seismic loading.The result will help us to understand the levee behavior during the earthquake intensity of 7 degree.
引文
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[2]徐志英,沈珠江.高尾矿坝地震液化与稳定分析[J].岩土工程学报,1981,3(4):22-32.XU Zhi-ying,SHEN Zhu-jiang.Liquefaction and stability analysis of a high tailing dam under earthquake excitation[J].Chinese Journal of Geotechnical Enginee-ring,1981,3(4):22-32.
[3]李万红.土石坝地震变形和滑波及液化非线性分析[J].水利学报,1996,(8):65-70.LI Wan-hong.Nonlinear analysis for seismic deformation and slope slide of earth dams[J].Journal of Hydraulic Engineering.1996,8:65-70.
[4]Biot M A.General theory of three-dimensional consolidation[J].Journal of Applied Physics,1941,(12):155-164.
[5]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equations and curves[J].Journal of Soil Mechanics and Foundation Division Proceedings of ACSE.,1972,98:667-691.
[6]蔡袁强,凌道盛,周迪永,等.非线性分层地面运动反演分析[J].振动工程学报,2000,13(3):426-432.CAI Yuan-qiang,LING Dao-sheng,ZHOU Di-yong.Inverse calculational analysis of ground motion in nonlinear layered soil[J].Journal of Vibration Engineering,2000,13(3):426-432.
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