盾构隧道施工对邻近建筑物的影响

发布时间：2018-12-12 21:18

【摘要】：现阶段我国各地城市化建设步伐的进程不断加快,城市交通拥挤问题日益严重。只有运用大量的公共交通系统尤其是作为城市交通骨干的地铁,才能有效的缓解各类地上交通拥堵运营差的问题,提高城市的交通运输效率。进入21世纪起,修建地铁隧道采用盾构法施工成为当下的热门方法,盾构施工产生的地层扰动较其他方法修建隧道要小很多,但是仍然不能完全避免对周围土层产生扰动,在侧穿或者靠近地面上建筑物时,引起的土体损失必然或多或少地影响建筑物,使之产生沉降或者倾斜,影响其安全性。本论文针对邻近既有建筑物的盾构隧道施工,应用MIDAS GTS NX有限元软件建立盾构隧道-土体-建筑物共同作用的三维模型,研究盾构隧道施工时对邻近建筑物的影响效应及影响规律,可以为日后地铁隧道线路的规划提供依据。首先,本论文介绍了盾构隧道施工的发展状况和主要施工环节,以及隧道施工时对土体产生扰动和影响的主要原因。针对盾构施工引起地层扰动进而影响建筑物倾斜和沉降,给出了三种不同的评价地铁施工对地层扰动的控制评价标准和计算方法。其次,通过数值模拟软件建立有盾构隧道和建筑物两者的有限元模型进行数值模拟计算,分析随着盾构的推进开挖隧道造成地表沉降的发展规律,研究邻近既有建筑物的盾构法隧道施工引起的横向和纵向的地表沉降曲线分布特点。计算结果表明盾构施工引起地表横向沉降符合经验公式计算结果的的规律,建筑物存在的情况下地表沉降较经验公式计算值偏大。最后,对建筑物的变形及位移进行研究,分析盾构法隧道施工对邻近建筑物的影响效应与影响规律,以及距离隧道不同位置处建筑物变形特点和位移变化规律。隧道距离邻近建筑物越近,建筑物沉降越大,最大沉降值和建筑物的倾斜未超出安全限制,基于此可预测建筑为安全状态。
[Abstract]:At present, the pace of urbanization in various parts of China is accelerating, and the problem of urban traffic congestion is becoming more and more serious. Only by using a large number of public transport systems, especially the subway as the backbone of urban traffic, can we effectively alleviate the problem of poor traffic congestion and improve the efficiency of urban transportation. Since the 21st century, the construction of subway tunnel by shield method has become a popular method. The ground disturbance caused by shield tunneling is much smaller than that of other methods, but it can not completely avoid the disturbance to the surrounding soil layer. The soil loss caused by the side penetrating or near the ground must affect the building more or less, cause it to settle or tilt, and affect its safety. In this paper, a three-dimensional model of shield tunnel-soil-building interaction is established by using MIDAS GTS NX finite element software for shield tunnel construction of adjacent existing buildings. The research on the influence effect and law of shield tunnel construction on adjacent buildings can provide the basis for the planning of subway tunnel line in the future. Firstly, the paper introduces the development of shield tunnel construction and the main construction links, and the main reasons of disturbance and influence on soil mass during tunnel construction. In view of the ground disturbance caused by shield tunneling, which affects the inclination and settlement of buildings, three different evaluation criteria and calculation methods for the control of ground disturbance by subway construction are presented. Secondly, the finite element model of shield tunnel and building is established by numerical simulation software, and the development law of ground subsidence caused by excavation tunnel with shield tunneling is analyzed. The distribution characteristics of lateral and longitudinal surface settlement curves caused by shield tunneling adjacent to existing buildings are studied. The calculation results show that the lateral settlement caused by shield tunneling accords with the rule of empirical formula, and the calculated value of surface settlement is larger than that of empirical formula in the presence of buildings. Finally, the deformation and displacement of buildings are studied, and the effects of shield tunneling on adjacent buildings are analyzed, as well as the deformation characteristics and displacement variation of buildings at different locations from the tunnel. The closer the tunnel is to the adjacent buildings, the larger the building settlement is, and the maximum settlement value and the inclination of the building do not exceed the safety limit. Based on this, it can be predicted that the building is safe.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43

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