水利学报2017，Vol.48Issue(6)：640-650,11.DOI:10.13243/j.cnki.slxb.20161087
多孔连续介质渗透压力对变形应力影响的数值模拟方法探讨
Study on numerical simulation method used in analyzing the effect of seepage pressure in continuous medium with pores on deformation and stress
摘要
Abstract
Seepage force and uplift pressure are often used to analyze seepage field's influence on deformation and stress,which is a simplified proximal algorithm ignored solid media's own deformation under pore pressure.For fine-granular medium like soil and sand,this self-deformation can be ignored,but for continuous medium with pores like concrete and rock with cracks,the neglect of pore pressure's effect on solid medium and overestimate of uplift pressure will misestimate the deformation and effective stress.From the perspective of stress-strain under pore pressure,regarding the pore pressure as initial strain (initial stress),the paper derives the finite element formula for seepage load (named "initial strain/stress" method).Comparing different results getting from different calculation methods,it shows that from the calculation using seepage force and uplift pressure as seepage load,the obtained deformation and effective stress appear too large error and sometimes are even wrong,while the "initial strain/stress" method can come to correct result of deformation and stress.关键词
多孔连续介质/渗流场/孔隙压力/初应变/有效应力Key words
continuous medium with pores/seepage field/pore pressure/initial strain/effective stress分类
数理科学引用本文复制引用
张国新..多孔连续介质渗透压力对变形应力影响的数值模拟方法探讨[J].水利学报,2017,48(6):640-650,11.基金项目
国家重点研发计划项目(2016YFB0201000) （2016YFB0201000）
国家自然科学基金项目(51579252,51439005) （51579252,51439005）
