土体物理力学性质对钻孔灌桩桩孔壁稳定性影响的数值模拟

Numerical simulation of the effect of soil physical and mechanical properties on the stability of hole wall of bored pile

孔壁稳定性是制约钻孔灌注桩成桩质量的关键因素,土体物理力学性质对孔壁稳定性的影响至关重要。运用ANSYS软件数值模拟土体物理力学性质对孔壁稳定性的影响,研究土体弹性模量、黏聚力、内摩擦角和泊松比对孔壁稳定性的影响。研究表明,孔壁处节点位移最大,距离孔壁越远,节点位移越小,稳定性越好;土体弹性模量、黏聚力和内摩擦角对孔壁稳定性的影响较大,而土体泊松比对孔壁稳定性的影响较小;土体弹性模量、黏聚力和内摩擦角越大,孔壁稳定性越好;黏聚力和内摩擦角越小的土体,黏聚力和内摩擦角的提高对孔壁稳定性的提高效果越明显。

The stability of hole wall is the key factor to restrict the quality of bored pile,and the influence of soil physical and mechanical properties on the stability of hole wall is very important.The influence of physical and mechanical properties of soil on the stability of hole wall is simulated by using numerical simulation software ANSYS,and the influence of elastic modulus,cohesion,internal friction angle and Poisson's ratio of soil on the stability of hole wall is studied.The research shows that the node displacement at the hole wall is the largest,and the farther away from the hole wall,the smaller the node displacement and the better the stability.The influence of soil elastic modulus,cohesion and internal friction angle on hole wall stability is obvious,but the influence of soil Poisson's ratio on hole wall stability is small.The larger the elastic modulus,cohesion and internal friction angle of soil,the better the stability of hole wall.The smaller the cohesion and internal friction angle is,the more obvious the improvement of the cohesion and internal friction angle is to the stability of the hole wall.