ABAQUS渗流应力耦合分析中渗透荷载施加问题探讨  

Problems of Applying Seepage Pressure in Coupling Analysis of Seepage and Stress Using ABAQUS

作　　者：吕从聪 李宗利[2] 李东奇 LU Cong-cong;LI Zong-li;LI Dong-qi(College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China;College of Water Conservancy and Architecture Engineering, Northwest A ＆ F University, Yangling 712100, China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《长江科学院院报》2018年第5期68-72,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金面上项目(51379178);中央高校基本科研业务费专项(ZD2012015)

摘　　要：渗流应力耦合问题是目前数值分析的热点之一,渗流对应力的影响主要体现在渗透荷载上,然而不同学者应用ABAQUS进行渗流应力耦合分析建模时,在水荷载边界条件施加方面出现2种个问题:定义了孔压边界后,是否还有必要施加静水压力;考虑了坝基的渗流作用,是否还需要在坝底面定义扬压力荷载。通过竖向应力平衡和孔隙静水压力平衡理论及算例对这2个问题进行分析,结果表明:在应用ABAQUS进行渗流应力耦合分析时应同时考虑静水压力和孔压边界;当不考虑坝体渗透性时,应施加扬压力,而考虑坝体渗透性时,则无需再单独施加扬压力。分析成果可为研究ABAQUS进行混凝土重力坝渗流应力耦合分析时渗流荷载和水边界条件的施加问题提供参考。Coupling analysis of seepage and stress has attracted considerable attention in numerical simulation. The influence of seepage on stress is reflected in the seepage load. Nevertheless,there are two decided differences listed below when scholars deal with the water pressure and boundary conditions with ABAQUS software： whether it is necessary to apply hydrostatic pressure when pore pressure boundary is defined; and whether it is essential to define uplift pressure on dam foundation if the seepage field of foundation rock is considered. In view of this,we analyzed the two problems based on vertical stress balance and pore hydrostatic pressure balance theories as well as numerical examples,and conclude that both hydrostatic pressure and pore pressure boundary should be considered when submitting coupled process of seepage and stress with ABAQUS software. Moreover,uplift pressure should be applied when the permeability of dam body is not considered; but when the permeability of dam body is taken into consideration,uplift pressure is not required anymore. The results offer reference for the application of ABAQUS software to seepage-stress coupling analysis of concrete gravity dam.

关 键 词：渗流应力耦合模型 ABAQUS 坝体渗透性 水荷载边界条件 坝基扬压力 

分 类 号：TV331[水利工程—水工结构工程]