双圆盾构施工对交叠隧道影响的研究
发布时间：2018-09-05 12:20
【摘要】：近年来,地下空间隧道交错重叠的案例不断增多,对于双线隧道下穿交叠隧道的建设中,传统的单圆盾构工法在狭窄的地下空间和浅埋线路中具有一定的局限性,双圆盾构工法能一次完成双线隧道的开挖,免除地下联络通道的建设,具有节约地下空间、缩短施工工期、节约成本的独到优势,可预见将广泛应用于双线隧道建设中。然而,双圆盾构特殊的构造和施工工艺在施工中对地层的扰动不同于普通的单圆盾构工法,研究双圆盾构施工对交叠段附近地层和交叠隧道影响的范围与程度具有重要的意义。本文以某双线隧道下穿交叠隧道段为研究背景,通过数值模拟的方法对比分析了双圆盾构与传统盾构在施工中对地层与交叠隧道影响的差异,并分析了双圆盾构交叠段施工中的各影响因素。主要研究内容如下:(1)对双圆盾构施工影响机理及有限元理论进行了描述,以某双线隧道下穿交叠隧道段为工程背景,利用有限元软件ADINA,建立单圆单线盾构工法、单圆双线盾构工法和双圆盾构工法的动态施工模型,分别分析三种盾构工法施工引起土体变形、地表位移、交叠隧道应力和变形特性;将单圆单线盾构工法的数值解与监测值进行了对比,验证了数值模型的有效性;并将三种盾构工法计算结果进行对比,结果表明双圆盾构工法对地表和交叠隧道的影响范围最小,在加固范围和施工控制上有一定优势。(2)探讨了双圆盾构土仓压力、施工速度、施工引起的地层损失率、新老隧道的净距与埋深以及交叠隧道的洞径等影响因素对地表沉降和交叠隧道变形的影响规律。(3)从双圆盾构施工技术控制、交叠隧道加固措施和中间土层的加固措施三方面着手,提出双圆盾构下穿交叠隧道工程的施工控制技术,为类似工程的设计、施工和优化提供一些参考。
[Abstract]:In recent years, there are more and more cases of interlacing and overlapping underground space tunnels. In the construction of overlapping tunnels under double-line tunnels, the traditional single-circle shield method has some limitations in the narrow underground space and shallow buried lines. The double circle shield tunneling method can complete the excavation of the double-line tunnel at one time and avoid the construction of the underground connection passageway. It has the unique advantage of saving underground space, shortening the construction period and saving the cost. It can be predicted that it will be widely used in the construction of the double-line tunnel. However, the special structure and construction technology of double circular shield machine is different from the single circle shield method in the construction. It is of great significance to study the extent and extent of the influence of double circle shield construction on the strata and overlapping tunnels near the overlapping section. In this paper, the difference between double circle shield and traditional shield on stratum and overlapping tunnel is compared and analyzed by numerical simulation based on the research background of a double line tunnel crossing the overlapping tunnel section under the background of this paper, and the method of numerical simulation is used to analyze the difference between the double circle shield and the traditional shield in the construction of the tunnel. The influencing factors in the construction of overlapping section of double circular shield are analyzed. The main research contents are as follows: (1) the influence mechanism and finite element theory of double circle shield construction are described. Taking the crossing section of a double line tunnel as the engineering background, the single circle and single line shield construction method is established by using the finite element software ADINA,. The dynamic construction models of single circle and double line shield construction method and double circle shield construction method are analyzed, respectively. The soil deformation, surface displacement, overlapping tunnel stress and deformation characteristics caused by three shield construction methods are analyzed respectively. The numerical solution of single circle and single line shield construction method is compared with the monitoring value, the validity of the numerical model is verified, and the calculation results of three kinds of shield construction methods are compared. The results show that the double circle shield method has the smallest influence on the surface and the overlapping tunnel, and has some advantages in the reinforcement scope and construction control. (2) the pressure, construction speed and formation loss rate caused by the double round shield tunneling are discussed. The influence law of net distance and buried depth of new and old tunnel and the diameter of overlapping tunnel on surface subsidence and superimposed tunnel deformation are discussed. (3) the construction technology of double circular shield is controlled. This paper puts forward the construction control technology of the crossing tunnel under double circular shield, which provides some references for the design, construction and optimization of similar projects.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43
本文编号：2224254
[Abstract]:In recent years, there are more and more cases of interlacing and overlapping underground space tunnels. In the construction of overlapping tunnels under double-line tunnels, the traditional single-circle shield method has some limitations in the narrow underground space and shallow buried lines. The double circle shield tunneling method can complete the excavation of the double-line tunnel at one time and avoid the construction of the underground connection passageway. It has the unique advantage of saving underground space, shortening the construction period and saving the cost. It can be predicted that it will be widely used in the construction of the double-line tunnel. However, the special structure and construction technology of double circular shield machine is different from the single circle shield method in the construction. It is of great significance to study the extent and extent of the influence of double circle shield construction on the strata and overlapping tunnels near the overlapping section. In this paper, the difference between double circle shield and traditional shield on stratum and overlapping tunnel is compared and analyzed by numerical simulation based on the research background of a double line tunnel crossing the overlapping tunnel section under the background of this paper, and the method of numerical simulation is used to analyze the difference between the double circle shield and the traditional shield in the construction of the tunnel. The influencing factors in the construction of overlapping section of double circular shield are analyzed. The main research contents are as follows: (1) the influence mechanism and finite element theory of double circle shield construction are described. Taking the crossing section of a double line tunnel as the engineering background, the single circle and single line shield construction method is established by using the finite element software ADINA,. The dynamic construction models of single circle and double line shield construction method and double circle shield construction method are analyzed, respectively. The soil deformation, surface displacement, overlapping tunnel stress and deformation characteristics caused by three shield construction methods are analyzed respectively. The numerical solution of single circle and single line shield construction method is compared with the monitoring value, the validity of the numerical model is verified, and the calculation results of three kinds of shield construction methods are compared. The results show that the double circle shield method has the smallest influence on the surface and the overlapping tunnel, and has some advantages in the reinforcement scope and construction control. (2) the pressure, construction speed and formation loss rate caused by the double round shield tunneling are discussed. The influence law of net distance and buried depth of new and old tunnel and the diameter of overlapping tunnel on surface subsidence and superimposed tunnel deformation are discussed. (3) the construction technology of double circular shield is controlled. This paper puts forward the construction control technology of the crossing tunnel under double circular shield, which provides some references for the design, construction and optimization of similar projects.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43
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相关硕士学位论文 前1条
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