连续孔隙介质渗透压力对变形应力影响的数值模拟方法探讨

Seepage force and uplift pressure are often used to analyze seepage field's influence on deformation and stress, which is .This is a simplified proximal algorithm, which ignores 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 pore medium 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.