土石坝地基液化分析的一种解耦方法(英文)  

A decoupled approach to liquefaction analysis of earth dam foundation

作　　者：周健[1,2] 孔戈[3,4] 王绍博 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]同济大学交通运输工程学院,上海200092 [4]上海浦东新区建设工程技术监督有限公司,上海201209 [5]上海市地震局,上海200062

出　　处：《岩土工程学报》2009年第10期1578-1583,共6页Chinese Journal of Geotechnical Engineering

基　　金：National Natural Science Foundation of China (90815 008)

摘　　要：土石坝的液化稳定性评价一般都是基于Biot理论的。对于大型复杂问题,特别是当孔隙流体难以压缩或者土骨架的渗透性很低的情况下,采用耦合方法对Biot方程中的孔隙流体场和固体场同时进行求解往往是不经济甚至不可靠的。而对每个子场进行解耦求解是一种有效的方法。为了充分利用程序资源,着眼于能够应用于现有热–力学耦合场分析软件二次开发的解耦方法。首先对Biot方程和热–力学耦合场控制方程进行了对比研究,然后提出了一种多步迭代分割算法。该算法采用微分形式,对二维或三维问题、静力或动力问题都适用,能应用于各种单元类型。随后,应用这种新方法对上海青草沙水库围堤地基进行了液化分析,并得到了有价值的结论。The evaluation of the liquefaction stability of earth dams is usually based on the Biot＇s theory. For complex or large scale problems, the simultaneous solution of the fluid and solid response equations in the Blot＇s equations using a coupled scheme may be mathematically uneconomical or unreliable, especially when the compressibility of the pore fluid and the permeability of the solid skeleton are small. An efficient alternative is to solve each subproblem in a decoupled way. To make full use of the existing source codes, this paper is concerned with the decoupled approach which can be easily employed to redevelop the pre-existing thermal-mechanical analysis software. After the comparison between the Biot＇s equations and the equations governing coupled thermal-mechanical fields, a new multi-iteration partitioned solution procedure is presented. There is no need for any alteration to apply this scheme to 2D or 3D problems, static or dynamic problems, as well as various element types, for its taking the differential form. Subsequently, the liquefaction analysis of the foundation of Shanghai Qingcaosha Reservoir embankment is performed to illustrate the applicaton of this new scheme, with some valuable conclusions drawn in the end.

关 键 词：BIOT方程 解耦方法 分割算法 土石坝地基 液化分析 

分 类 号：TU411[建筑科学—岩土工程]