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微型桩复合土钉墙是复合土钉墙中的一种重要形式,对于坑底存在软弱土层的微型桩复合土钉墙,坑底地基承载力或抗隆起稳定分析是土钉墙稳定性验算的一项重要内容,而目前还没有合适的验算方法。在商业有限元软件Plaxis中建立三维和二维模型,应用强度折减技术分析了微型桩复合土钉墙坑底地基承载力计算问题,探讨了坑底软弱土层分布较深以及坑底为软弱夹层两种情况下,微型桩的嵌固深度、桩径(刚度)、桩身强度等对强度折减安全系数的影响情况,并分析了其中的原因,以期对微型桩复合土钉墙地基承载力验算有所帮助。
The micro-pile composite soil nailing wall is an important form in the composite soil nailing wall. For the micro-pile composite soil nailing wall with weak soil at the bottom of the pit, the bearing capacity or anti-swelling stability analysis of the foundation bottom is the check of the stability of the soil nailing wall Of an important content, but there is no suitable method of checking. In the commercial finite element software Plaxis, three-dimensional and two-dimensional models were established. The strength reduction technique was used to analyze the calculation of the bearing capacity of the foundation pit of the mini-pile composite soil nailing wall. The distribution of the weak soil layer at the pit bottom was deep and the pit bottom was weak The effect of the pile depth, the pile diameter (stiffness) and the strength of the pile on the safety factor of strength reduction are analyzed in two cases, and the reasons are analyzed. Strength test helpful.