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机构地区:[1]大连交通大学土木与安全工程学院,辽宁大连116028 [2]大连交通大学辽宁省隧道与地下结构工程技术研究中心,辽宁大连116028
出 处:《安全与环境学报》2013年第2期196-201,共6页Journal of Safety and Environment
基 金:辽宁省自然科学基金项目(201202022);大连市科技计划项目(2011E15SF118)
摘 要:软弱地层条件下,地铁车站深基坑施工在围护结构施工、开挖施工、主体结构施工阶段的变形规律和失稳状况比一般地区城市深基坑更加复杂,具体表现为施工期间的深基坑围护结构与主体结构对周边环境会产生不良影响,易引起较大的地表沉降,给工程施工造成重大安全隐患。为解决这一问题,以大连地铁某车站为研究对象,首先,基于FLAC3D构建该地铁车站深基坑数值分析模型,模拟施工开挖过程,分析软弱地层地铁车站深基坑变形特征及地表沉降趋势;然后,根据仿真数据与现场实际监测数据的对比,进行深基坑开挖过程安全性分析,绘出地表沉降对比分析曲线,给出深基坑工程引起地表沉降变化的动态趋势,探讨软弱地层地铁车站周围地表沉降预测方法。结果表明,基于钢支撑与地下连续墙相结合的软弱地层深基坑围护结构可有效维持土体平衡,约束土体变形。The present paper is inclined to introduce our process simulation and safety analysis of the deformation and subsidence caused by the excavation of the underground foundation pits in the metro station construction. The paper has also made a comparison between the surface subsidence between the actual measured value and the simulation value we have gained from the process simulation in FLAC3D. As a matter of fact, under the weak-loose geological conditions, it tends to be much more complex and complicated to make clear the deformation regularity and the causes that account for the instability of the deep foundation pit excavation than in regular conditions, for the disparity between the sustaining structure and the principal structure of the deep foundation pits tends to cause adverse effects on the surrounding environment in the construction process, such as more serious subsurface subsidence or the collapse of the surrounding grounds due to the imbalanced shock to the surrounding structures. For the above purposes, we have chosen one of Dalian metro stations under construction as our study sample and established a numerical analysis model based on the FLAC3D simulation, with which, we have finished our simulation and analysis for the process. The results of our simulation can be stated as follows: First of all, the surface subsidence had mainly been occurring in a certain range around the deep foundation pit and growing with the increase of the depth of the excavation. And, next, in accordance with the comparison and monitoring, the actual data measured with the simulation data, we have analyzed the excavation safety features of the deep foundation pit by drawing the curves of the surface subsidence by means of the MATLAB software, and finally worked out the dynamic variation trend. In addition, the problem has also been discussed by using the method of engineering prediction and controlling for the loose surface structure subsidence of the surrounding area. Thus, the reasons and regularities we have found fro
关 键 词:安全工程 软弱地层 深基坑开挖 地表沉降 数值模拟 安全性分析
分 类 号:X937[环境科学与工程—安全科学]
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