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复合土钉支护作为一种新型支护技术具有广阔的应用前景,但目前相关的研究远远落后于工程实践。本文运用有限元软件ABAQUS建立了超前钢管桩、土钉、预应力锚索三种支护结构不同组合的复合土钉支护和简单土钉支护的三维模型,对基坑的开挖支护过程进行了数值模拟。研究表明:复合支护下基坑开挖面最大水平位移发生在基坑下部;钢管桩对开挖面中上部水平位移限制作用明显;土钉轴力的分布成中间大、两端小的形式。本文的结果与前人的研究成果相符,可以为工程提供一定参考。
Composite soil nailing as a new type of support technology has broad application prospects, but the relevant research lags far behind the engineering practice. In this paper, a three-dimensional model of composite soil nailing and simple soil nailing with different combinations of three kinds of supporting structures of advanced steel pipe piles, soil nails and prestressed anchor cables is established by finite element software ABAQUS. The excavation of the foundation pit The process of protection was numerically simulated. The results show that the maximum horizontal displacement of the excavation face of the foundation pit under the composite support occurs at the lower part of the foundation pit. The steel pipe pile has a significant limiting effect on the horizontal displacement of the upper middle part of the excavation face. form. The result of this paper is consistent with previous research results, which can provide some reference for engineering.