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边桩是地铁车站洞桩法施工过程中的一个重要构件,其受力状态较复杂。根据洞桩法施工过程受力分析,中板下部土体的开挖是边桩受力状态发生显著变化的主要阶段,当开挖至轨道层底部而未浇筑二衬时,边桩处于受力最不利的状态。基于此,探讨了边桩的内力计算问题,得到了中板下部土体开挖过程中考虑临时横撑作用时桩身内力计算公式,最不利的状态下边桩的内力计算公式,以及考虑桩顶的竖向分力对桩身产生附加弯矩的内力计算公式,并与模型试验结果进行了对比,表明了计算公式的合理性,可供工程设计参考。
Side piles are an important component in the construction of subway station under the method of hole pile, and the stress state is more complicated. According to the mechanical analysis of the construction process of the hole pile method, the excavation of the soil in the lower part of the middle plate is the main stage of significant change in the stress state of the side pile. When excavating to the bottom of the orbit layer without pouring the second lining, The most unfavorable state. Based on this, the calculation of internal force of side piles is discussed. The formula of internal force of piles under temporary bracing is obtained in the process of excavation of the lower part of middle slab. The formula of internal force of side piles in the most unfavorable condition is obtained, The vertical internal force of the pile body to generate additional bending moment of the internal force calculation formula and compared with the model test results show that the calculation formula is reasonable and can be used for engineering design reference.