承力盘坡角对水平力作用下扩盘桩破坏机理影响的理论分析

Theoretical analysis on the influence of the slope angle of plate on the failure mechanism of the expanded-plates pile under the horizontal force

混凝土扩盘桩作为一种新型桩,由等截面混凝土灌注桩发展而来。通过在桩身的不同位置设置承力盘,从而使普通直桩变为变截面桩,同时桩的受力机理也发生了变化。其特点是具有承载力高,沉降变形小的优点。通过ANSYS软件建立不同承力盘坡角的分析模型,对模拟结果进行应力和位移分析。定性地确定了混凝土扩盘桩在水平荷载下的桩土破坏特征和承力盘坡角的大小对其承受水平荷载的影响,完善了混凝土扩盘桩的理论基础,有助于对该型桩的进一步研究和在今后大规模应用在实际工程中。

As a new type of pile,the concrete expanded-plates pile( CEP pile) is developed from the constant section concrete pile. By setting the bearing plate in different positions of the pile body,the constant section concrete pile is changed into the variable section pile,and the stress mechanism of the pile also changes. The characteristics of the CEP pile are the advantages of high bearing capacity and small settlement deformation. The ANSYS software was used to establish the analysis model with different slope angles of plate,and the stress and displacement of the simulation results were analyzed. The research can qualitatively determine the failure characteristics of pile and soil,and the influence of slope angle of bearing plate under the horizontal load,improve the theoretical foundation of concrete expanded-plates pile,which is benefit to the study of the pile and large scale application in the actual project in the further.