地震作用下海床孔隙水压力增长的算法研究  

A Practical Algorithm for the Evaluation of Seismic-Induced Pore Pressure in the Seabed

作　　者：栾茂田[1] 张小玲[1] 张其一[1] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116024

出　　处：《中国矿业大学学报》2008年第5期630-634,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(50439010);教育部科学技术研究项目重大项目(305003);国家自然科学基金项目(50579006;50179006);教育部跨世纪优秀人才培养计划研究基金(教技函[1999]2号)

摘　　要：针对饱和砂质海床,建立了由Terzaghi固结理论与不排水条件下孔隙水压力增长模式相耦合的含有源项的初边值方程,运用数理方程中的分离变量法与Green函数求解得到了一个较为一般的孔隙水压力解答.结果表明:海床土的渗透性对于海床的抗液化性能有显著影响,渗透系数的微小减小就会导致海床中累积孔隙水压力比的显著增大;在海床相对深度小于0.5时,由地震所引起的海床中各个相对深度处累积孔隙水压力比随着海床厚度的减小而减小;当海床相对深度大于0.7后,规律相反.An initial boundary equation with a source term, which couples Terzaghi＇s consolidation theory with the experimentally-derived model of incremental seismic-induced pore pressure, is described for use with a saturated sandy seabed. A general analytical solution of pore pressure was obtained by applying the methods of separation of variables and the Green＇s function in the mathematical equation. The results show that the effect of soil permeability on liquefaction of the seabed soil is remarkable. A small reduction of the permeability coefficient can lead to a significant increment in accumulative excess pore-pressure-ratio of the seabed. The seismic accumulative excess pore pressure of the seabed increases with decreasing seabed thick- ness when the relative depth is less than 0.5. The reverse is true when the relative depth is more than 0. 7.

关 键 词：孔隙水压力 液化 地震荷载 解析解 

分 类 号：TU441.8[建筑科学—岩土工程]