Abstract

Info

Title:: Study on Spatial Effect of Foundation Pit in Typical Strata of Jinan

Author(s):: LI Lian-xiang; CHENG Xiao-yang; HUANG Jia-jia; HU Feng; Foundation Pit and Deep Foundation Engineering Research Center, Shandong University

Keywords:: foundation pit; cell calculation; plane strain question; spatial effect; integral calculation; typical strata

Abstract:: Aiming at the excavation process of Shandong Provincial Capital Culture and Art Center, a three-dimensional finite element model considering the spatial effect of foundation pit was established by using finite element software PLAXIS 3D. The influences of the negative angle, the positive angle and the excavation width of the foundation pit on the supporting structure were obtained, and the deep analysis was made. The formulas of foundation pit deformation considering the depth and width of foundation pit and the insertion depth of supporting structure were summarized. The influences of pit toe coefficient and depth ratio on the pit supporting structure were analyzed, and the spatial effect of foundation pit in Jinan was clarified. The results of integral calculation, cell calculation and two-dimensional calculation were compared. The results show that the integral calculation method of foundation pit considering spatial effect is more reasonable. For the threedimensional calculation model of the super deep and super large foundation pit, considering the influences of spatial effect on the supporting structure and surrounding environment, it has reference significance for grasping the whole working mechanism of foundation pit, avoiding accidents, and the overall layout and space optimization of fine design of foundation pit.