基于ABAQUS的非饱和边坡流-固耦合分析  

The fluid-solid analysis of unsaturated slope based on ABAQUS

作　　者：陈勇[1] 杨贝贝[1,2] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]深圳市岩土综合勘察设计有限公司,广东深圳518000

出　　处：《地下空间与工程学报》2016年第4期938-945,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然基金重点项目(50839004);湖北省教育厅自然科学研究项目(D20121303)

摘　　要：简要阐述了流-耦合模型的基本理论:Biot固结理论和有效应力原理,并讨论了非饱和土边坡中渗流场和应力场的相互影响;基于流-固理论和ABAQUS中耦合模型的建立,对三峡库区某滑坡在5种工况下稳定性分析研究。模拟计算结果表明:降雨入渗比库水位变动对该滑坡稳定性影响大,库水位变动对滑坡前缘土体影响较大,降雨入渗对滑坡浅层土体影响较大;利用ABAQUS中*Soils分析步分析边坡的流固耦合现象是可行的,在计算工况下,该滑坡处于稳定状态,与监测资料对比,模拟结果总体可靠,可以作为该边坡稳定分析评价及排水加固设计的依据。The basic theory of coupling model is briefly expounded： Biot consolidation theory and the effective stress principle,and the influence between the unsaturated soil seepage field and stress field is discussed; Based on the coupled flow-solid theory and the coupling model in ABAQUS,a landslide stability analysis in the three gorges reservoir area under five kinds working condition is made. Simulation results show that the influence of the rainfall infiltration on the stability of the landslide is greater than the change of water level,the latter has a greater influence on the front soil of landslide,however the former on the shallow layer of soil; Using STEP ＊ Soils in ABAQUS to analysis fluid-structure interaction phenomenon is feasible,under the calculated conditions,the landslide is in stable state,and compared with monitoring data,the simulation results are overall reliable and it can be used as the evaluation of slope stability analysis and the basis of drainage reinforcement design.

关 键 词：流固耦合理论 ABAQUS 库水变动 降雨入渗 

分 类 号：TU431[建筑科学—岩土工程]