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复合式重力坝基坑支护结构是介于重力式水泥土坝和排桩两种围护形式之间的一种复合支护形式。由于这种复合支护结构内部受力关系复杂,除有限元法外尚未有较好的变形计算方法。在弹性支点法的基础上,提出了一种考虑空间效应的两阶段迭代计算方法。该方法第一阶段按常规弹性支点法计算,第二阶段在第一阶段得到的变形曲线基础上,将内插加筋体摩擦力产生的附加弯矩叠加到围护体的受力与变形计算中。最后结合工程实例的实测结果对该方法进行了对比验证。
The compound gravity dam foundation pit supporting structure is a kind of compound support form between two kinds of enclosure forms of gravity cement earth dam and row pile. Due to the complex relationship between the internal forces of the composite support structure, there is not a good method for calculating the deformation except the finite element method. Based on the flexible pivot method, a two-stage iterative calculation method considering space effect is proposed. The first stage of the method is calculated according to the conventional elastic fulcrum method. Based on the deformation curve obtained in the first stage, the second stage adds the additional bending moment generated by the frictional force of the inserted reinforcement body to the calculation of the force and deformation of the enclosure body in. Finally, the method is compared with the actual measurement results of engineering examples.