摘要
随着现代城市的快速发展,大规模地下空间开发是一个必然的趋势。地铁车站深基坑的开挖过程中的变化规律已经成为现代城市地下空间施工的一个研究重点。
本论文以深圳地铁5号线临海路站深基坑工程为背景,阐述了地铁车站深基坑开挖及支护理论。对地铁车站深基坑支护土压力计算、支护结构的内力、支护变形机理、支护结构与土体共同变形原理以及支护结构内力与变形的影响因素进行了分析,对支护结构体系变形的现场监测方法,测点布置及监测频率进行较全面的说明。运用FLAC3D软件建立模型,模拟开挖施工过程,研究地铁车站深基坑支护结构的内力变化及地表沉降等。
通过地铁车站深基坑现场监测中地表沉降、墙顶水平位移、横撑轴力、墙体水平位移的监测数据,从而绘出地表沉降、墙顶水平位移、横撑轴力、墙体水平位移的曲线图,得到其变化的动态反应。运用FLAC3D数值模拟软件能够更好的来帮助我们分析地铁深基坑开挖的规律。因此对地铁车站深基坑施工过程中进行受力变形规律的研究显得非常重要。研究结果对以后的地铁车站深基坑工程施工提供参考依据。
With the rapid development of modern cities, large-scale underground space development is an inevitable trend. Subway station during the excavation of deep foundation pit has become a research focus in modern construction of urban underground space.
On the background of deep foundation pit construction in LinHailu Station of Metro Line 5 in Shenzhen, the subway station deep excavation and the supporting theory are stated. The earth pressure of deep foundation pit supporting, the internal forces of retaining structure, the supporting deformation mechanism, the mutual deformation mechanism of support together with the soil mass as well as the influential factors of the internal force and deformation in retaining structure are analyzed. The field tests of the supporting structure system deformation, the measuring point distribution and the monitoring frequency are also entirely described. Using the FLAC3D, the model is established to simulate the excavation construction. The internal forces changes and the surface settlement of the retaining structure of deep foundation pit in subway station are studied.
According to the field monitoring data of the surface settlement, the horizontal displacement of top wall, the lateral brace axial force and the horizontal displacement in deep foundation pit in subway station, the curves are drawn and the dynamic effect are obtained. The FLAC3D can help us better analyze the laws of deep excavation underground. Therefore, during the process of deep excavation of the subway station, the force and deformation are very important and significant. The research results can provide the references for the later project of deep foundation pit in subway station.
引文
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