【摘要】 针对现阶段咬合桩结构变形计算研究不足的问题，在考虑冠梁作用的基础上，采用p-y曲线法建立咬合桩变形计算模型，推导出计算咬合桩结构变形的公式，并利用有限差分法对计算咬合桩结构变形公式进行求解.依托兰州某深基坑工程案例，将所提算法计算出的结果与PLAXIS 3D有限元软件模拟出的结果进行对比分析.结果表明：在计算咬合桩的变形时，通过刚度等效原理，将咬合桩结构等效为地下连续墙结构计算是可行的；冠梁与咬合桩结构存在协同变形关系，冠梁能够控制咬合桩结构的变形；所提算法计算结果与数值模拟结果虽然趋势相同，但数值存在一定差异，这是由于计算过程中与模拟过程中咬合桩桩底的约束条件及土体的本构关系不同造成的.更多还原

【Abstract】 Aiming at the problem of insufficient research on the deformation calculation of the secant pile at present, on the basis of considering the effect of the top beam, the p-y curve method is used to establish the deformation calculation model of the secant pile, and the formula for calculating the structural deformation of the secant pile is deduced. The finite difference method is used to solve the formula for calculating the deformation of secant pile structure. Based on the case of a deep foundation pit in Lanzhou, the results calculated by the proposed calculation method are compared with the results simulated by the PLAXIS 3D finite element software. The results show that: When calculating the deformation of secant pile, it is feasible to equivalent secant pile structure to underground diaphragm wall structure through stiffness equivalent principle. There is a cooperative deformation relationship between the top beam and the secant pile structure, and the top beam can control the deformation of the secant pile structure. Although the trend of the results calculated by the proposed calculation method is the same as that of the numerical simulation, there are some differences in the numerical value, which is due to the different constraint conditions of the bottom of the secant pile and the constitutive relation of the soil in the process of calculation and simulation.更多还原