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大型深基坑开挖对近距离桥墩稳定性影响数值分析 被引量:3

Numerical Analysis of the Effect of a Large Area and Deep Excavation Project on Nearby Piers
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摘要 文章以长沙轨道交通5号线华雅车站为工程背景,研究了大型深基坑开挖对邻近桥墩稳定性的影响。采用ANSYS和FLAC3D软件建立基坑的三维计算模型,根据现场实际情况模拟开挖。将计算结果和现场监测数据进行对比,并且采用假设检验方法进行验证,结果表明,三维计算模型合理以及计算结果有效。深基坑开挖会形成环形塑性区,导致邻近桥墩发生较大沉降,最大值达到5.95 mm。采用混凝土支撑与钢支撑相结合的支护方式,可以有效降低桥墩的沉降。 The excavation of a large area and deep foundation pit in line 5 of Changsha rail transit was deemed as the engi- neering background, the influence of the project on the stability of nearby piers was studied.The three-dimensional model of excavation was established by using the nmnerical simulation software ANSYS and FLAC3D.And the model was simulated according to the actual situation of the foundation pit.The calculation results are compared with the field monitoring data by the hypothesis testing, and the rationality of the excavation model and the reliability of the calculation results were verified. The results show that the excavation of foundation pit will form a circular plastic zone, resulting in a larger settlement on the near pier, with a maximum value of 5.95mm.The combination of concrete support and steel support can effectively reduce the settlement of piers.
作者 饶永强 凌涛 王成洋 杨维 黄光 熊胜 张佳华 Yong-qiang;LING Tao;WANG Cheng-yang;YANG Wei;HUANG Guang;XIONG Sheng;ZHANG Jia-hua(The First Engineering Co.,Ltd.,China Railway Wuju Group,Changsha,Hunan 410000,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China)
出处 《企业技术开发》 2018年第8期1-6,共6页 Technological Development of Enterprise
基金 国家自然科学基金资助项目“基于非线性能量耗散理论的盾构斜井/隧道掘进面稳定性研究”(51804113) 湖南科技大学博士启动基金资助项目“浅埋隧道稳定性的能耗分析与可靠度设计”(E51768) 湖南科技大学博士后科研基金资助项目“基于极限分析法的煤矿软岩巷道破坏机理研究”(E61610) 南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室开放基金资助项目“软弱围岩条件下地下硐室稳定性的能耗分析”(E21734)
关键词 深基坑开挖 三维模型 假设检验 沉降量 塑性区 Deep foundation pit excavation Tthree-dimensional model Hypothesis testing Settlement Plastic zone
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