摘要
针对深基坑开挖过程中的变形规律和支撑结构内力分布特征,采用三维数值模拟方法,模拟了深基坑的开挖全过程,分析了在房屋荷载和道路汽车荷载影响下,基坑的开挖变形趋势和坑壁水平变形随深度的变化规律、三层横向支撑和地下连续墙的受力特征及支护效果。研究结果表明:基坑开挖完成后最大变形出现在8层房屋荷载侧,量值约为14 cm,房屋荷载对基坑变形的影响深度约为荷载作用深度的3倍;横向支撑第一层主要受力结构为贯梁,第二、三层为主梁,辅梁起固定和连接作用;地下连续墙主要受压应力,中下部受力大于中上部,最大压应力约为5 MPa,连续墙弯矩最大值出现在8层房屋侧深度为6 m处,其值约为1 600 kN·m,在6 m、10 m和14 m处弯矩出现3处明显拐点,说明横向支撑对地下连续墙弯曲具有一定的限制效果。
The deformation and the internal force distribution characteristics of the supporting structure in a deep excavation project are presented in this paper.Three-dimensional numerical simulation method was used to simulate the entire process of the excavation.Under the influence of building load and roadway vehicle load,the excavation deformation trend of the excavated area and the horizontal deformation of the supporting wall were analyzed.The variation pattern with depth,the stress characteristics of the three-layer lateral support and the underground continuous wall and the supporting effect are evaluated.The results show that the maximum deformation occurs on the loading side of the 8-story building after the excavation,and the value is about 14 cm.The depth of the building load on the deformation of excavation is about 3 times that of the loading width.The main force structure of the first layer of the transverse support is the tubular beam,the second and third layers are the main beams,and the auxiliary beams play a fixed and connecting role.The main compressive stress of the underground continuous wall is greater than that of the middle and upper parts.The maximum compressive stress is about 5MPa.The maximum bending moment of the continuous wall appears at the depth of 6m on the side of the 8-story building,and the value is about 1600 kN·m.There are three obvious inflection points at 6m,10m and 14m,indicating that the lateral support has a certain limiting effect on the bending of the underground continuous wall.
作者
解宝金
XIE Baojin(China MCC17 Group Co.Ltd.,Ma’anshan 243000)
出处
《土工基础》
2025年第4期548-552,共5页
Soil Engineering and Foundation
关键词
深基坑
开挖变形
结构内力
外荷载
数值模拟
Deep Excavation
Excavation Deformation
Structural Internal Force
External Load
Numerical Simulation
