复合土钉支护结构的FLAC^(3D)三维仿真分析

The three-dimensional simulation of composite soil nailing support structure based on FLAC^(3D)

以南京某商品房基坑支护工程为例,应用基于三维快速拉格朗日元法的计算软件FLAC3D建立复合土钉支护结构的三维模型,对基坑开挖与支护进行了模拟,计算中采用摩尔-库仑弹塑性模型,通过数值模拟及实测数据对比详细分析了该基坑开挖导致的地面沉降规律、基坑周围岩体的水平位移特征、土钉内力的分布特征,验证了三维快速拉格朗日元法应用于复合土钉支护结构的变形研究方面的合理性及其优势,丰富并完善了复合土钉支护结构变形的预测理论,其结论对同类工程的研究、设计、施工有重要的参考价值。

Taken Nanjing foundation pit support engineering as an example,the three-dimensional model of shaft is based on the three- dimensional fast Lagrangian element method,the calculation used of Moore-Coulomb elastic-plastic model,according to the comparison and analysis between the result of simulation and that of real survey result in build site, analyzed the characteristics of surface subsidence and the horizontal displacement of rock mass around the foundation which cause by excavation and shoring, the characteristics of soil nails internal force is also discussed. Confirmed the rationality and advantages of the three-dimensional fast Lagrangian method which used in compound soil nailing structure,enrich and improve the forecast theory of predict deformation of composite soil nailing support. The conclusion that we have reached provides an important reference value to the research, design and construction of the kind projects.