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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,按实际工况进行了开挖支护的三维非线性有限元模拟,其中土体采用修正剑桥弹塑性模型,计算结果与现场实测数据能较好地吻合,表明本文研究方法是可行的。现场实测数据与四种不同型式复合土钉墙围护结构基坑开挖的数值计算结果,均表明三维基坑开挖存在明显的“角部效应”;在复合土钉墙中设置灌注桩墩与锚杆对于减小灌注桩、搅拌桩、锚杆、土钉及周边土体变形及内力有是利的,且灌注桩墩的影响效应要超过锚杆,故在深基坑开挖中采用桩墩扶壁复合土钉墙支护结构是合理有效的。
According to the actual conditions, the three-dimensional nonlinear finite element simulation of excavation and support is carried out for the foundation pit with embankment and composite soil nailing wall retaining wall in the soft soil area. The modified elasto-plastic model of Cambridge is used to calculate the result It can be in good agreement with the measured data in the field, indicating that the method of this paper is feasible. Field measurements and numerical results of excavation of four different types of composite soil nailing retaining walls show that there are obvious “corner effect” in the excavation of three-dimensional foundation pit; perfusion in the composite soil nailing wall The pile pier and the anchor rod are beneficial to reduce the deformation and internal forces of the grouting pile, the mixing pile, the anchor rod, the soil nail and the surrounding soil mass, and the influence effect of the pier pile is more than that of the anchor rod. Therefore, It is reasonable and effective to use the composite pierced nailing wall supporting structure in the piers.