以某土钉支护形式的基坑工程为依托，结合土体和土钉的复合作用机理，建立土钉支护结构的三维数值模型。采用Mohr－Coulomb塑性模型，对基坑分步施工的过程进行了模拟分析，得出土钉拉力、坡顶水平位移和地面沉降的发展规律。研究结果表明：数值计算得到的基坑坡顶土体水平位移、竖向沉降的结果与现场监测数据基本吻合，整体三维模拟结果更接近实测值；土钉的拉力与长度、所处开挖面位置有相关性，拉力最大值随开挖深度的大小而发生变化。%Based on a soil nailing structure engineering ,considering the composite mechanism of soil nail and soil ,a three-dimensional numerical model of soil nailing structure was developed .Mohr-Coulomb model was adopted to analyze the process of foundation pit construction step by step ,which revealed the law of soil nail force ,development horizontal displacement and slope ,ground subsidence .The results show that the data of horizontal displacement and vertical settle-ment of slope crest is close to the measured data ,especially in whole three-dimensional results;tension and strength of soil nailing has correlation with excavation surface position ,maximum tension changes with the depth of the excavation .
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