工程地质学报2017，Vol.25Issue(6)：1430-1437,8.DOI:10.13544/j.cnki.jeg.2017.06.005
黏性土失水开裂多场耦合离散元数值模拟
NUMERICAL SIMULATION OF DRYING CRACKING USING MULTI-FIELD COUPLING DISCRETE ELEMENT METHOD
摘要
Abstract
Desiccation cracks can be formed in clay soil during drying,which connects with each other to generate a network.This process involves multi-field coupling effect,including water,thermal and stress.A close-packed model is used to simulate the formation of desiccation cracks.The simulation is based on the 3D discrete element modeling software MatDEM that is independently developed by Nanjing University.In the model,a discrete unit represents an assembly of soil particles,pore and pore water.Elements in the model are assigned moisture properties,where the transport of moisture can be simulated based on the Finite Difference Method.Furthermore,the coupling of moisture field and stress field is built,which considers the influence of moisture on the tensile strength of soil.In numerical simulation,assuming the water of soil surface evaporates at a certain rate,element diameters and mechanical parameters are calculated from moisture according the experimental data,so as to simulate evaporation,shrinkage and cracking processes of clay soil.Numerical simulation results coincide with the laboratory results,and each step of cracking process can be well simulated.This paper provides an alternative way for the numerical simulation of soil deformation and failure under multi-field effect.关键词
黏土/土体开裂/离散元/数值模拟Key words
Clay soil/Desiccation crack/DEM/Numerical simulation分类
天文与地球科学引用本文复制引用
张晓宇,许强,刘春,施斌..黏性土失水开裂多场耦合离散元数值模拟[J].工程地质学报,2017,25(6):1430-1437,8.基金项目
国家自然科学基金项目(41230636,41302216),国家杰出青年科学基金项目(41225011),江苏省自然科学基金青年项目(BK20130377)资助. （41230636,41302216）
