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新近发展起来的复合土钉支护技术已显示出它在软土地基浅基坑 (开挖深度 H≤ 7m)工程中应用的巨大潜力 ,但其设计计算理论却远远不能满足目前工程应用的需要。作者基于非线性平面应变有限元模拟方法 ,对复合土钉墙结构体系在分步开挖、分步支护过程中的变形性能进行研究 ,初步获得了该支护结构体系的变形发展规律。此外 ,有限元分析结果和实际工程调查 ,均显示出整体稳定性问题是复合土钉墙支护成败的关键。据此提出在工程设计和施工过程中 ,一定要验算这种可能存在的深部滑移稳定性。还得出了其他有利于指导工程设计和施工的结论。
The newly developed composite soil nailing technology has shown its great potential in shallow foundation pit excavation depth (H ≤ 7m) project, but its design theory is far from the current engineering applications need. Based on nonlinear finite element method of plane strain simulation, the author studies the deformation performance of composite soil nailing wall system in stepwise excavation and step-by-step supporting process, and obtains preliminary deformation rules of the supporting structure system. In addition, the results of finite element analysis and actual engineering survey show that the overall stability problem is the key to the success or failure of composite soil nailing wall. Therefore, it is necessary to check the possible existence of deep slippage stability in the engineering design and construction process. Also come to other conclusions conducive to the guidance of engineering design and construction.