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以某软土基坑采用毛竹复合土钉墙支护的工程实例为背景,利用有限元软件PLAXIS建立某设计剖面的平面应变有限元模型。为提高数值分析定量计算分析的精度,采用了能反映土体小变形和加卸载变形等特点的小应变刚度模型。通过对土钉墙面层及毛竹排桩的水平位移、坡顶沉降、毛竹土钉的轴力以及毛竹排桩的剪力和弯矩分布规律的分析,对堤坝形毛竹复合土钉墙的工作性状获得了较全面的认识,并探索了其可能的失稳破坏形式。采用该程序自带的强度折减有限元法计算了各开挖工况下支护体系的稳定安全系数,表明毛竹复合土钉墙在施工期间和施工后均具有较高的稳定性,具备可靠的支护能力。
Based on the engineering example of a soft soil foundation pit supported by bamboo composite soil nailing wall, a plane strain finite element model of a designed section was established by finite element software PLAXIS. In order to improve the accuracy of quantitative analysis of numerical analysis, a small strain stiffness model which can reflect the small deformation of soil and the characteristics of loading and unloading deformation is adopted. Through the analysis of horizontal displacement, top settlement, the axial force of bamboo soil nails and the shear force and bending moment distribution of bamboo piles, the work of embankment-shaped bamboo composite soil nailing wall Traits gained a more comprehensive understanding, and explored the possible form of destabilization. The program of strength reduction finite element method is used to calculate the stability safety factor of the supporting system under various excavation conditions. It shows that the bamboo composite soil nailing wall has high stability during construction and after construction, with reliable Support capacity.