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针对软土地区采用桩墩扶壁复合土钉墙围护结构的基坑,按实际工况进行了基坑开挖支护的三维全尺寸非线性有限元模拟,其中土体采用修正剑桥弹塑性模型。研究结果表明:桩墩扶壁复合土钉墙围护结构中的灌注桩墩具有良好的挡土效应,而锚杆则对周边土体具有较好的锚固作用,为了充分发挥灌注桩墩及锚杆本身性能,并减小基坑开挖对复合土钉墙工作性状的不利影响,建议实际施工中灌注桩间距控制在2~2.5 m、嵌固深度不超过基坑开挖深度,而锚杆倾角则宜控制在20°以内。
According to the actual conditions, the three-dimensional full-scale nonlinear finite element simulation of foundation pit excavation is carried out. The soil is modified by the modified Cambridge elasto-plasticity model. The results show that the piles of the piled pier buttress composite soil nailing wall retaining wall have good retaining effect and the anchor rod has good anchoring effect on the surrounding soil. In order to give full play to the perfusion piles and anchors And reduce the negative impact of foundation pit excavation on the working properties of composite soil nailing wall. It is suggested that the spacing of the cast-in-place piles should be controlled within 2 ~ 2.5 m in actual construction, the depth of embedding should not exceed the excavation depth, Inclination should be controlled within 20 °.