长大明挖隧道基坑开挖过程数值模拟研究  

Numerical Simulation Study on the Excavation Process of Foundation Pit of Long Open-Cut Tunnel

作　　者：周盛全 周泽和 姚希磊 刘芝东 余诚 Zhou Shengquan;Zhou Zehe;Yao Xilei;Liu Zhidong;Yu Cheng(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232000,China;Lunan High-speed Railway Co.,Ltd.,Jinan,Shandong 250014,China;The Seventh Engineering Co.,Ltd.of CTCE Group,Hefei,Anhui 230000,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽准南232000 [2]鲁南高速铁路有限公司,山东济南250014 [3]中铁四局集团有限公司第七工程分公司,安徽合肥230000

出　　处：《黑龙江工业学院学报（综合版）》2024年第8期110-116,共7页Journal of Heilongjiang University of Technology(Comprehensive Edition)

基　　金：国家自然科学基金(项目编号:41977236);国家自然科学基金(项目编号:41672278);绿色建筑与装配式建造安徽省重点实验室(安徽省建筑科学研究设计院)资助课题(课题编号:2022-JKYL-006)。

摘　　要：为研究软弱土地区三种支护方式对基坑稳定性的影响,以新建津潍高铁明挖隧道为工程背景,运用ABAQUS有限元软件进行数值模拟研究,对比分析不同支护方式下基坑位移变形规律。结果表明:三种开挖方式下坡顶位置处的水平位移均呈现“扇形”;在地表沉降方面,放坡开挖阶段,三种开挖由坡顶向远离基坑逐渐减小,设置围护结构后,有围护结构的沉降变化呈“勺子”形分布;坑底隆起变形图呈“碗”状,在设置围护结构后,“碗”状由两侧支护外侧向中间收拢。三种支护方式下均在放坡开挖阶段,喷锚支护时位移最小,设置围护结构后,地连墙支护位移最小。三种开挖方式位移结果对比分析表明,地连墙围护结构最为稳定,SMW工法桩其次,喷锚支护稳定性最低。In order to study the influence of three support methods on the stability of foundation pit in weak soil area,this paper takes the new open-cut tunnel of Tianjin-Weihai high-speed railway as the engineering background,the numerical simulation study was carried out by using ABAQUS finite element software,and the displacement and deformation law of the foundation pit under different support modes were compared and analyzed.The results show that the horizontal displacement at the top of the slope under the three excavation methods is"fan-shaped".In terms of surface settlement,in the slope excavation stage,the three types of excavation gradually decrease from the top of the slope to the distance from the foundation pit,and after the enclosure structure is set,the settlement change of the enclosure structure is distributed in a"spoon"shape.The uplift deformation diagram at the bottom of the pit is in the shape of a"bowl",and after the enclosure structure is set,the"bowl"shape is closed from the outside of the two sides of the support to the middle.Under the three support modes,the displacement is the smallest when spraying the anchor support,and the displacement of the ground wall support is the smallest after the enclosure structure is set.The comparative analysis of the displacement results of the three excavation methods shows that the ground wall enclosure structure is the most stable,followed by the SMW construction pile,and the stability of the spray anchor support is the lowest.

关 键 词：软弱土 深基坑 数值模拟 基坑变形 

分 类 号：TU473[建筑科学—结构工程] U455[建筑科学—土工工程]