下穿隧道对既有地铁车站的影响研究
发布时间：2018-09-17 14:30
【摘要】：随着城市地下空间工程的蓬勃发展,城市地铁交通工程迎来了发展的高峰,新建地铁隧道下穿既有车站的岩土工程技术问题也将大量涌现出来。新建隧道在施工过程中将对周围岩层产生二次扰动,同时既有车站结构也将产生新的变形和附加内力。为了实现地铁隧道工程安全、经济、环保的设计理念,了解地铁工程施工过程中下穿既有车站结构的影响是十分必要的。本文主要以重庆地铁环线下穿三号线重庆北站车站为工程背景,通过Midas GTS有限元软件进行数值模拟与施工开挖步骤分析。着重研究地铁隧道开挖对车站的沉降量和结构内力的影响。主要的研究内容及成果如下:①采用岩土力学方法分析下穿隧道对既有地铁车站的影响和变形机理,研究夹层土体对下穿隧道的影响。②分析对比地铁隧道常用施工方法,结合重庆北站工程具体情况,选取了合理的施工方案。③以重庆北站南广场轨道交通环线下穿轨道交通三号线重庆北站为工程背景,通过Midas—GTS建立三维实体模型,在存在受深基坑等结构物的复杂条件下,对地铁隧道下穿既有地铁车站进行了数值模拟计算,得到地铁车站的结构变形的影响特征和规律。④运用PKPM对轨道交通三号线重庆北站地铁车站进行内力验算,对车站梁柱结构内力进行分析。⑤通过结构位移计算和结构内力计算,确定了重庆北站南广场轨道交通环线下穿轨道交通三号线重庆北站的设计方案的可行性。
[Abstract]:With the vigorous development of urban underground space engineering, the urban subway traffic engineering has ushered in the peak of development, and the geotechnical problems of the new subway tunnel passing through the existing stations will also emerge in large numbers. During the construction of the new tunnel, the surrounding rock layer will be disturbed twice, and the new deformation and additional internal force will also occur in both the station structure and the construction process. In order to realize the design concept of safety, economy and environmental protection in subway tunnel engineering, it is necessary to understand the influence of the existing station structure in the course of subway construction. In this paper, based on the engineering background of Chongqing North Railway Station, Midas GTS finite element software is used to carry out numerical simulation and excavation analysis. The influence of subway tunnel excavation on station settlement and structural internal force is studied. The main research contents and results are as follows: 1 the influence and deformation mechanism of underpass tunnel on existing subway station is analyzed by geotechnical mechanics method, and the influence of interlayer soil on underpass tunnel is analyzed and compared with common construction methods of subway tunnel. According to the specific conditions of Chongqing North Railway Station, the reasonable construction scheme .3 is selected to set up a three-dimensional solid model through Midas-GTS, taking Chongqing North Railway Station as the engineering background, and taking Chongqing North Railway Station as the engineering background under the rail transit ring line of the south square of Chongqing North Railway Station. Under the complicated condition of deep foundation pit and other structures, the numerical simulation of subway tunnel passing through the existing subway station is carried out. The influence characteristics and regularity of the structural deformation of the subway station are obtained. 4. The internal force of the subway station of Chongqing North Railway Station on the third Line of Rail Transit is checked and calculated by using PKPM. By analyzing the structural internal force of Liang Zhu, the feasibility of the design scheme of Chongqing North Railway Station is determined by calculating the displacement of structure and the calculation of internal force of structure.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U231.4;U456.3
本文编号：2246218
[Abstract]:With the vigorous development of urban underground space engineering, the urban subway traffic engineering has ushered in the peak of development, and the geotechnical problems of the new subway tunnel passing through the existing stations will also emerge in large numbers. During the construction of the new tunnel, the surrounding rock layer will be disturbed twice, and the new deformation and additional internal force will also occur in both the station structure and the construction process. In order to realize the design concept of safety, economy and environmental protection in subway tunnel engineering, it is necessary to understand the influence of the existing station structure in the course of subway construction. In this paper, based on the engineering background of Chongqing North Railway Station, Midas GTS finite element software is used to carry out numerical simulation and excavation analysis. The influence of subway tunnel excavation on station settlement and structural internal force is studied. The main research contents and results are as follows: 1 the influence and deformation mechanism of underpass tunnel on existing subway station is analyzed by geotechnical mechanics method, and the influence of interlayer soil on underpass tunnel is analyzed and compared with common construction methods of subway tunnel. According to the specific conditions of Chongqing North Railway Station, the reasonable construction scheme .3 is selected to set up a three-dimensional solid model through Midas-GTS, taking Chongqing North Railway Station as the engineering background, and taking Chongqing North Railway Station as the engineering background under the rail transit ring line of the south square of Chongqing North Railway Station. Under the complicated condition of deep foundation pit and other structures, the numerical simulation of subway tunnel passing through the existing subway station is carried out. The influence characteristics and regularity of the structural deformation of the subway station are obtained. 4. The internal force of the subway station of Chongqing North Railway Station on the third Line of Rail Transit is checked and calculated by using PKPM. By analyzing the structural internal force of Liang Zhu, the feasibility of the design scheme of Chongqing North Railway Station is determined by calculating the displacement of structure and the calculation of internal force of structure.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U231.4;U456.3
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，本文编号：2246218
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