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根据深基坑土钉支护的受力特点 ,土钉与土体粘结滑移的工作性能 ,以及实际工程中的开挖建造与锚杆预应力施加等一系列施工过程 ,编制了针对锚杆 -土钉复合支护的三维非线性有限元程序 ,重点讨论了锚杆的存在对坑壁变形与土钉内力的影响。分析结果表明在对变形要求较严时 ,使用锚杆 -土钉复合支护可以有效控制变形。
According to the stress characteristics of soil nailing in deep foundation pits, the work performance of bond-sliding between soil nails and soil, and a series of construction processes such as excavation construction in actual engineering and application of prestressing force of anchor bolts, an anchoring system was developed. Three-dimensional nonlinear finite element program for composite support of rod-soil nails, focusing on the influence of the existence of bolts on the deformation of the pit wall and the internal forces of soil nails. The analysis results show that when the deformation requirements are strict, the use of bolt-soil nail composite support can effectively control the deformation.