A controlled variable excavation method for large deformation tunnels
A large deformation and tunnel technology, applied in the field of large deformation tunnel control, can solve the problems of great construction risk, uncontrollable construction risk, and prolong construction period, so as to optimize the combination of steel frames, improve shear resistance, and save construction. effect of time
Active Publication Date: 2020-02-14
CHINA RAILWAY ERJU 1ST ENG CO
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[0004] The purpose of the present invention is to provide a method of controlled variable excavation for large deformation tunnels, so as to solve the large construction risks in the construction of mountain tunnels with such geological conditions by conventional construction methods, and the construction risks are extremely uncontrollable. To a certain extent, the construction period was extended and other issues
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[0040] Refer to attached Figure 1-5 , the present embodiment provides a controlled variable excavation method for a large deformation tunnel, specifically as follows:
[0041] ①Optimize the section, adjust the curvature of the structure outline, adopt the arch part as a single-center circle, the side wall as a large-radius arc (R726cm), and the inverted arch and the side wall are connected by a small-radius arc (R295cm), which is adaptable to stress flow and deformation Reasonable shape, so that the structural force and the stability of the surrounding rock are in favorable conditions, so that the force is more reasonable to meet the design clearance requirements.
[0042] ②Optimize the combination form of the steel frame, reasonably select the gradient to reserve the amount of deformation, especially between the first layer and the second layer of the excavation interface according to the deformation of 25cm, increase the linear curvature of the deformation to 1.657 times th...
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The invention belongs to the technical field of tunnel construction, and provides a deformation-controlling excavation method for tunnels with large deformation. According to the deformation-controlling excavation method for the tunnels with large deformation, fracture surfaces are optimized, and the structure contour curvature is adjusted. An arch is a single-centered circle, side walls are largeradius arcs, and an inverted arch is connected with each side wall by a small radius arc. Steel frame combination forms are optimized, gradient reserved deformation amount is reasonably selected, especially construction is carried out with deformation being 25cm between a first and second layer of excavation interfaces, and the deformation linear curvature is increased. Each middle step adopts along anchor rod with 6.5 meters to replace a temporary inverted arch, and passive constraint is changed into active constraint. Star-shaped I18 longitudinal beams are added between steel frames. The length and height of the steps are reasonably selected according to specific geological conditions. The problems that a conventional construction method for mountain tunnels with such geological conditions has great construction risks, the construction risks are extremely uncontrollable, and the construction period is extended to a certain extent are solved.
Description
technical field [0001] The invention relates to a deformation control method for a large deformation tunnel and belongs to the technical field of tunnel underground construction engineering. Background technique [0002] With the acceleration of domestic infrastructure construction and the construction of a large number of tunnel projects, it is inevitable to deal with large deformations caused by various special geology. The topography and geomorphology of mountain tunnels that cross the weak fault zone are generally areas where surface water is easy to collect. The excavation of the Zongsi Tunnel of the Lixiang Railway that is currently under construction has revealed that it is carbonaceous shale, with low compressive and shear strength and is easy to encounter water. Softening, no self-stabilization ability, and the large deformation of the surrounding rock lead to the removal and replacement of the primary support, which greatly increases the construction risk. [0003...
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IPC IPC(8): E21D9/00E21D9/14E21D11/00E21D11/18E21D11/28
CPCE21D9/00E21D9/14E21D11/003E21D11/18E21D11/28
Inventor 万斐李黎梁恩华唐忠全浦同体何复生王国炜曾军薛蕴柯秦凯辜启辉沈科田立兵李长松陈林
Owner CHINA RAILWAY ERJU 1ST ENG CO