[1]马博涵,范 瑛.地铁隧道上部基坑施工监测与数值模拟研究[J].湖北工业大学学报,2019,34(2):106-111.
　MA Bohan,FAN Ying.Monitoring and Numerical Simulation of Foundation Pit in Subway Tunnels[J].,2019,34(2):106-111.
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地铁隧道上部基坑施工监测与数值模拟研究()
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《湖北工业大学学报》[ISSN:1003-4684/CN:42-1752/Z]

卷:
34卷
期数:
2019年第2期
页码:
106-111
栏目:
湖北工业大学学报
出版日期:
2019-04-30

文章信息/Info

Title:
Monitoring and Numerical Simulation of Foundation Pit in Subway Tunnels
文章编号:
1003-4684(2019)02-0106-06
作者:
马博涵;  范  瑛
湖北工业大学土木建筑与环境学院， 湖北 武汉 430068
Author(s):
MA Bohan;  FAN Ying
School of Civil Engin.，Architecture and Environment，Hubei Univ.of Tech.，Wuhan 430068，China
关键词:
基坑;  开挖;  监测;  数值模拟
Keywords:
foundation pit;  excavation;  monitoring;  numerical simulation
分类号:
TU43
文献标志码:
A
摘要:
在已有地铁隧道顶部进行深基坑工程施工，支护结构及基坑的稳定会受到较大的影响。以武汉市光谷大道南延线的地铁隧道上某深基坑工程为例，对基坑的支护结构水平位移、钢支撑轴力等进行现场监测，结果表明：采用灌注桩组成的基坑支护结构相比分级放坡开挖更有利于基坑的稳定；随着基坑开挖的进行，钢支撑的轴力会先增大后减小，当开挖接近底部时支撑轴力趋于稳定；灌注桩支护结构的深层水平位移随着基坑开挖逐渐增大，总体呈两头小中间大的“弓”形。在此基础上采用midas/gts有限元对基坑开挖进行了数值模拟，对比分析模拟值与监测值变化规律，验证了数值模拟方法的可行性，为基坑支护方案设计、施工方法的选择和监测点布设提供依据。
Abstract:
The construction of deep foundation pits on the top of the existing subway tunnel will greatly affect the stability of the supporting structure and foundation pit. Take a deep foundation pit project on the subway tunnel on the south extension line of Guanggu Avenue in Wuhan as an example, the horizontal displacement of the supporting structure of the foundation pit and the axial force of the steel support are monitored on site. The results show that the foundation pit consists of cast-in-place piles. Compared with the graded grading excavation, the supporting structure is more conducive to the stability of the foundation pit; as the foundation pit excavation progresses, the axial force of the steel support will increase first and then decrease. When the excavation approaches the bottom, the supporting axial force tends to in the stable; the deep horizontal displacement of the cast-in-situ support structure gradually increases with the excavation of the foundation pit, and the overall shape is a "bow" with a small middle and a large middle. Based on this, the midas/gts finite element method is used to simulate the excavation of the foundation pit. The variation of the simulated value and the monitored value is compared and analyzed. The feasibility of the numerical simulation method is verified, which could provide implications for the design of the foundation pit support scheme, the selection of the construction methods and the monitoring points.

参考文献/References:

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备注/Memo

备注/Memo:
［收稿日期］ 2018-09-25
［第一作者］ 马博涵(1991-)， 男， 湖北荆州人，湖北工业大学硕士研究生，研究方向为工程力学
更新日期/Last Update: 2019-11-29