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根据土钉支护、基坑开挖的受力特点、土钉及其与土体粘结的工作性能,建立三维计算模型,用有限元方法模拟基坑开挖与支护的施工过程、土钉拉力作用和土钉与周围土体粘结滑移的工作性能。在土的本构模型中,以应用Duncan提出的非线性EB模型为基础,参照LadeDuncan破坏准则提出一种加荷或卸荷(再加荷)判别准则,并考虑固结压力降低后弹性模量的确定方法。把这些原理应用于一个工程实例的计算分析,计算结果与实测结果有相同的变化趋势,数值大小基本吻合,验证了有限元模型和分析方法的可靠性。
According to the soil nailing, the stress characteristics of foundation pit excavation, soil nails and their workability with soil bonding, a three-dimensional calculation model was established, and the construction process and excavation of the foundation pit were simulated using the finite element method. Nail pulling force and workability of bond and slip of soil nail and surrounding soil. In the soil constitutive model, based on the application of Duncan’s non-linear EB model, a criterion of loading or unloading (re-loading) is proposed according to the Lade Duncan failure criterion, and the elastic modulus after the reduction of consolidation pressure is considered. The method of determination. These principles are applied to the calculation and analysis of an engineering example. The calculation results have the same trend as the actual measurement results. The numerical values are basically the same, which verifies the reliability of the finite element model and analysis method.