非饱和瞬态渗流的DDA流固耦合模型研究  

Fluid-solid coupling model for discontinuous deformation analysis of unsaturated transient seepage

作　　者：谢强[1,2] 陈昱成 傅翔 田大浪 班宇鑫 徐栋栋[4] XIE Qiang;CHEN Yucheng;FU Xiang;TIAN Dalang;BAN Yuxin;XU Dongdong(School of Civil Engineering,Chongqiong University,Chongqiong 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqiong University,Chongqiong 400045,China;School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqiong 400074,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]重庆交通大学河海学院,重庆400074 [4]长江科学院岩土力学与工程重点实验室,湖北武汉430010

出　　处：《岩土工程学报》2024年第2期299-306,共8页Chinese Journal of Geotechnical Engineering

基　　金：重庆市规划与自然资源局科技项目(DK2021Z05null01C)。

摘　　要：DDA由于处理块体大变形、大位移问题能力较强,因此被广泛应用在岩体数值模拟当中。但该方法在模拟渗流场,尤其是瞬态渗流场方面目前鲜有研究。根据立方定律建立DDA稳态渗流模型,将非饱和二维Richards方程离散化处理,推导DDA瞬态整体渗流矩阵。将水头矩阵以外荷载形式作用在块体上,建立瞬态非饱和渗流流固耦合DDA计算模型。通过对土柱入渗、砂槽入渗试验和危岩体工程案例进行数值模拟,验证了该模型的正确性,为DDA处理非饱和瞬态流固耦合问题提供新方法。The discontinuous deformation analysis(DDA)is widely used in numerical simulation of rock mass due to its capability to deal with large deformation and large displacement of a block.However,this method is rarely studied in simulating seepage field,especially transient seepage.Based on the steady-state seepage model established according to the cubic law,the unsaturated two-dimensional Richards equation is discretized and the transient global seepage matrix conforming to the DDA scheme is derived.The DDA transient unsaturated seepage fluid-solid coupling model for the DDA is established by acting the water head matrix as the external load form on the block.The correctness of the model is verified through the numerical simulation of soil column infiltration,sand tank infiltration tests and dangerous rock mass engineering cases,which provides a new method for the DDA to deal with the transient unsaturated fluid-solid coupling problem.

关 键 词：DDA RICHARDS方程 瞬态渗流 非饱和 流固耦合 

分 类 号：TU457[建筑科学—岩土工程]