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现代基坑工程中出现坑中坑的情况越来越普遍,设计需要对坑中坑的桩墙围护进行结构分析。坑中坑的外围基坑与内部基坑的桩墙存在相互影响,因此,坑中坑的桩墙围护结构受力分析相对而言更加复杂。针对这种坑中坑内、外桩墙的复杂受力情况,提出了坑中坑桩墙围护结构的弹性支点法联合求解模型,通过对内、外桩墙间有限土体的地基弹簧刚度的求解,使该模型可以解决坑中坑桩墙的内力变形计算问题。具体的坑中坑工程实例分析表明,采用弹性支点法联合求解模型得到的围护结构变形、内力与工程实际比较吻合,研究成果具有一定理论与工程实用意义。
The pit excavation in modern excavation is becoming more and more common. The design needs to analyze the structure of pile wall envelope in pit. Therefore, the stress analysis of pile wall retaining structure in pits is relatively more complicated. Aiming at the complex forces of the piles in the pit and the pile wall, a joint model of the elastic support for piled piles in the pits is put forward. By analyzing the stiffness of the foundation spring of the limited soil between the inner and outer piles, Solving this model can solve the problem of calculating the internal force deformation of the pit wall in pits. The analysis of the concrete pit engineering example shows that the deformation and internal force of the retaining structure obtained by the elastic fulcrum method are in good agreement with the engineering practice. The research results have certain theoretical and engineering practical significance.