建筑深基坑支护中复合土钉水泥土搅拌桩最佳厚度研究

应用ABAQUS有限元软件,对搅拌桩支护厚度与稳定性的相关关系进行分析。结果证明增加搅拌桩厚度可以有效控制位移,增加搅拌桩的稳定系数;随着搅拌桩厚度增加,滑动面将变缓,其主要位移从搅拌桩的顶部区域,逐渐下调并集中在搅拌桩的中段区域。在此基础上模拟复合土钉水泥土搅拌桩厚度(D)与基坑深度(H)的关系,并得出其最佳厚度关系式为:D=1.35H-5.575。

Research on optimum thickness of compound soil nailing cement-soil mixing pile in the building deep foundation pit supporting

ABAQUS finite element software has been used to analyze the relationship between the supporting thickness and stability of cement- soil mixing pile． The results show that the thickness of mixing pile controls the displacement and increases the stability effectively． The sliding surface becomes slower along with the thickness in- creasing of mixing pile，and the main displacement decreases and concentrates from the top to the middle part of mixing pile． Then，by simulating the relationship between the thickness of compound soil nailing cement- soil mix- ing pile and the deepness of foundation pit，the authors obtain the optimum formula is D =1. 35H －5. 575．