深基坑土钉支护结构的稳定性分析及三维有限元数值模拟

Stability analysis of the soil nailing structure for deep foundation pits and three-dimensional finite element numerical simulation

对土钉支护结构在各种破坏形式下的稳定性进行了分析及有限元数值模拟。研究了模糊随机可靠度的计算方法,并结合工程实例,通过编写MATLAB程序计算得到模糊可靠指标,并与安全系数、传统可靠指标相比较,得出了相关结论。在此基础上采用ABAQUS有限元软件建立了土钉支护结构的三维有限元模型,分析了基坑变形与土钉轴力的变化规律。研究表明:土钉支护结构能够有效地限制土体变形,故设计与排布土钉非常关键。

The stability of the soil nailing structure under various forms of damage is analyzed and the finite ele- ment numerical simulation is carried out. This paper studies the calculation method of the fuzzy-random reliabil- ity, and obtains the fuzzy reliability index by combining an engineering example with MATLAB programming. The index is compared with the safety factor and the traditional reliability index, and relative conclusion is obtained. On this basis, a three-dimensional finite element model of the soil nailing structure is built by using the ABAQUS finite element software, and the changing rule of the deformation of foundation pit and soil nail axial force is analyzed. The results indicate that the soil nailing structure can limit the soil deformation effectively, thus the design and layouts of soil nails are very critical.