斜边非轴对称位移边界下球孔扩张挤土分析

Analysis of soil squeezing effect for spherical cavity expansion with inclined nonaxisymmetric displacement boundary

针对斜边非轴对称位移边界条件下的沉桩球孔扩张,将桩体贯入模拟为球孔扩张过程,在线弹性土体模型的基础上,通过对地表边界以及倾斜边界上应力修正的镜像法,改进现有直边非轴对称球孔扩张理论,得到了斜边非轴对称位移边界下的球孔扩张挤土位移解答,并分析边界倾角及球孔边界距离等因素的挤土位移规律。研究结果表明,边界倾角越小,倾斜边界对球孔挤土位移的影响也越小;球孔边界距离越大,其对挤土位移的影响反而越小。文中解答可为类似斜边工程挤土位移的控制及参数设置提供参考。

Based on the mirror image method for the spherical cavity expansion with nonaxisymmetric displacement boundary,assuming that the soil as the linear elastic constitutive model,the soil compaction displacement field is obtained through the modifications of surface boundary stress and inclination boundary stress,the soil compaction displacement field could consider different boundary angles,different distances from spherical cavity position to the boundary,etc.The results indicate that the influence of boundary inclination angle on the soil compaction displacement would be gradually smaller with the reduce of inclination angle;and the larger distance from spherical cavity position to the boundary,has the smaller influence on the soil squeezing displacement.The results provide some reference for similar engineering design and parameter settings.