基于三剪统一屈服准则的灰土挤密桩特性分析

Performance of the lime-soil compacted pile based on the triple-shear unified yield criterion

以平面应变假设为前提,基于三剪统一屈服准则分析桩周土体应力情况,考虑中间主应力、各参数对塑性区发展及极限荷载的影响,推导出孔壁挤压力与塑性挤密半径的表达式。同时在孔径、深度、粘聚力以及内摩擦角不同的情况下,分析挤压力和塑性挤密半径的关系曲线。结果表明,挤压力相同时,孔径越大,塑性挤密半径越大;深度越大,塑性挤密半径越小。当其他参数及塑性挤密半径一定,粘聚力越大,挤压力越大;而内摩擦角越大,挤压力越小。

Taking the assumption of plane strain and considering the intermediate principal stress,the stresses around the lime-soil compacted pile in the process of the soil compaction was analyzed based on the triple-shear unified yield criterion. The relationship between the extrusion force and the plastic compact radius were also derived. In the solutions,the influence of the parameters on the plastic zone and the limit load were considered,and the relationship between the extrusion force and plastic compact radius with different aperture,depth,cohesion and internal friction angle were analyzed. The results showed that for a given extrusion force,the plastic compact radius increases with aperture and the plastic radius decreases with depth. When other parameters and the plastic radius were definite,the extrusion force increased with cohesion but decreased with the internal friction angle.