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在介绍常用沉管隧道基槽开挖护岸结构形式基础上,结合具体工程项目,对格栅连续墙支护结构的土压力和护岸支护结构设计进行了探讨,提出了格栅连续墙的简化计算方法,并采用简化计算法和有限元法进行了对比计算分析。对比两种方法的计算结果可知,与有限元方法相比,简化计算方法计算的弯矩偏大,位移偏小,主要是由于简化计算方法没有考虑格栅连续墙的空间效应导致弯矩偏大,且等效刚度偏大导致位移偏小;格栅连续墙由于其自身的几何形状,其墙身弯矩分布具有典型的空间特性。其中,内墙承受较大的水平弯矩,外纵墙弯矩均较小,通过对格栅连续墙弯矩分布规律的分析,可以对格栅连续墙结构的配筋进行优化设计。由于目前对格栅连续墙的受力特点和设计计算方法对其空间效应考虑较少,因此格栅连续墙结构的变形计算模式还有待进一步研究和探讨。本文对格栅式连续墙基坑的计算设计具有一定的参考和借鉴作用。
Based on the introduction of the structure of revetment for excavation and revegetation of the common immersed tunnel base and the concrete project, the earth pressure and the design of revetment supporting structure of the continuous diaphragm wall are discussed. The simplified grid continuous wall is proposed The calculation method is compared with the simplified calculation method and the finite element method. Comparing the calculation results of the two methods, we can see that the bending moments calculated by the simplified calculation method are larger and the displacements are smaller than the finite element method, mainly because the simplified calculation method does not consider the space effect of the continuous wall of the grid to cause the bending moment to be large , And the larger equivalent stiffness leads to smaller displacement. Due to its own geometric shape, the continuous wall of the grid has the typical spatial characteristics of the distribution of the bending moment of the wall. Among them, the inner wall to bear a greater horizontal bending moment, bending moment outside the wall are small, through the continuous wall bending moment distribution analysis of the grid can be carried out to optimize the design of reinforced diaphragm wall structure. Due to the current stress characteristics of grid continuous walls and the design and calculation methods for its space effect less consideration, so the gridding wall structure deformation calculation mode remains to be further studied and discussed. This article has some reference and reference for the calculation and design of the grid continuous wall foundation pit.