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。
Abstract
Piles were important components in construction of metro station using PBA(Pile-Beam-Arch) method, so the influence of tunnel face space on ground deformation could be complicated. According to construction process analysis, loading conditions of piles could be dramatically changed when excavation of the lower bench under the platform slab started and the most dangerous conditions would occur when soil mass excavation of the lower bench were accomplished. The internal force calculation methods were deduced considering the supporting of temporary cross-braces and the most dangerous conditions and additional bending moment caused by vertical loading. Comparisons between model test and calculation results presented its rationality.
关键词
洞桩法 /
边桩 /
内力计算
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中图分类号：
O 242.21
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参考文献
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