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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第1期    总第293期    2019年1月

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文章编号:1672-7207(2019)01-0198-08
基于渗流应力耦合的基坑开挖受力特性及其对邻近地铁隧道的影响
黄戡1,杨伟军1,马启昂1, 2,安永林3,李依1,周经伟1,邱朗1

(1. 长沙理工大学 土木工程学院,湖南 长沙,410114;
2. 中交二公局 第四工程有限公司,河南 洛阳,471013;
3. 湖南科技大学 土木工程学院,湖南 湘潭,411201
)

摘 要: 基于流固耦合理论,采用修正摩尔库仑本构关系,建立三维仿真模型,分析渗流特性、基坑开挖过程、不同降水速度下基坑施工特性以及其对邻近地铁的影响,并与实际监测结果进行对比分析。研究结果表明:土体渗流呈现空间差异性与时间差异性;基坑内降水速度对基坑外侧的地层变形影响较小;随开挖深度增大,土体位移增大,排桩水平位移总体上大于竖向位移;应力集中造成的基坑角部弯矩较大,在工程实践中应设置角部支撑分散应力集中产生的不利影响;锚固单元体系安全系数可满足设计要求;地铁区间隧道形状呈扁平状的椭圆形发展,隧道顶部及左右侧腰部受力较大,在设计施工中应进行配筋等加强处理;基坑开挖降水引起的左线隧道附加弯矩整体上明显大于右线隧道的附加弯矩;地铁隧道最大弯矩发生在左线地铁隧道中部靠近基坑位置;考虑流固完全耦合分析的计算结果与现场实测结果接近。

 

关键字: 基坑施工;地铁隧道;流固耦合;数值分析

Influence of foundation excavation pit on adjacent metro tunnel using fluid-solid mechanics theory
HUANG Kan1, YANG Weijun1, MA Qi’ang1, 2, AN Yonglin3, LI Yi1, ZHOU Jingwei1, QIU Lang1

1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. The Fourth Engineering Co. Ltd. of Second Highway Engineering Bureau,
Ministry of Communications and Transportation of China, Luoyang 471013, China;
3. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

Abstract:Based on the fluid-solid coupling theory, the modified Mohr-Coulomb constitutive relationship was adopted to establish a three-dimensional simulation model. The seepage characteristics, deformation and stress characteristics of foundation pit and adjacent subway during excavation under different speed dewaterings were analyzed, and they were compared with the actual monitoring results. The results show that soil seepage exhibits spatial difference and time difference. The precipitation speed has little effect on the deformation of the stratum around the foundation pit. When the depth of excavation increases, the displacement of the soil increases, and the horizontal displacement of row piles is generally greater than the vertical displacement of row piles. Stress concentration causes larger bending moment at the corner of foundation pit, so the corner brace should be set up to reduce the adverse effect of stress concentration in engineering practice. The safety factor of the anchoring unit system can meet the design requirements. The shape of metro intersection tunnel develops to be a flat ellipse, and the stress on the top and left and right waist of the tunnel is larger. Strengthening treatment such as reinforcement should be carried out in design and construction. The additional bending moment of the left line tunnel caused by dewatering in foundation pit excavation is obviously greater than that of the right line tunnel. The maximum bending moment of the subway tunnel occurs in the middle of the left lane subway tunnel, which is slightly close to the foundation pit. The results of the fluid-solid coupling analysis are closer to the measured results on the spot.

 

Key words: foundation pit construction; metro tunnel; fluid-solid coupling; numerical simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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