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基坑支护设计原理由不能计算变形的二分法、静力平衡法、塑性铰法、等值梁法发展到能计算变形的弹性地基梁法,在弹性地基梁法的基础上又进一步发展到弹性支点法。然而现有的弹性支点法在预应力作用下的受力模型、各工况之间的变形关系及锚杆刚度等方面存在不足,为弥补这些不足,提出了有针对性的加强措施增强上部锚杆以提高基坑的安全性,适当降低围护结构弯矩和下部锚杆强度,提高其经济性。
The design principle of foundation pit support is developed from the bisection method, the static balance method, the plastic hinge method and the equivalent beam method, which can not calculate the deformation, to the elastic foundation beam method which can calculate the deformation. Based on the elastic foundation beam method, Flexible pivot method. However, the existing elastic fulcrum method has some shortcomings in the stress model under prestressing force, the deformation relationship among various working conditions and the rigidity of the bolt. To make up for these shortcomings, some measures are proposed to strengthen the upper anchors Poles in order to improve the safety of foundation pit, reduce the bending moment of the retaining structure and the strength of the lower bolt, and improve its economy.