大锚片螺旋锚在粉质黏土中的下压承载性能

为研究大锚片螺旋锚在粉质黏土中竖向受压荷载下的受力性能,基于螺旋锚现场静载试验,讨论了确定其极限承载力方法的差异;考虑螺旋锚对周边土的挤压效应,建立精细化有限元模型,并将数值分析结果与试验结果进行对比,验证了有限元模型的合理性;基于验证的有限元模型,分析不同荷载等级下沿基础深度范围内的锚杆内力和侧摩阻力的变化规律,以及...

Bearing capacity of screw anchor with large anchor plate in silty clay

In order to study the mechanical performance of screw anchor under vertical compression load in silty clay area, firstly, based on the static load test of screw anchor, the differences of methods for determining its ultimate bearing capacity at home and abroad are discussed respectively; secondly, a refined finite element model is established for screw anchor, in which the compression effect of screw anchor on surrounding soil is considered, and the numerical analysis results and test results are compared; finally, based on the verified finite element model, the change rule of anchor internal force and side friction resistance along the range of foundation depth under different load levels is analyzed, as well as the proportion relationship between side resistance and anchor end resistance bearing load. The results show that the lgP-s method is suitable to determine the ultimate bearing capacity of the screw anchor foundation with large anchor pieces; the friction between the screw anchor and the soil increases with the increase of the down-force displacement, and the friction near the anchor plate fluctuates greatly due to the deformation of the anchor plate; the proportion of load shared by anchor pieces accounts for more than 75% of the load of the screw anchor foundation, the maximum difference of load shared by each anchor piece is about 6%, and the end resistance of screw anchor foundation can be negligible.