A large deformation control method for single-track railway tunnels in soft rock

A single-track railway and control method technology, which is applied in tunneling, earthwork drilling, design optimization/simulation, etc., can solve problems such as reducing economic costs, and achieve the effect of improving accuracy, improving bearing capacity and resistance to deformation, and simple steps

Active Publication Date: 2022-01-25
SINOHYRDO ENG BUREAU 3 CO LTD +1
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Problems solved by technology

[0003] The circular cross-section structure of the tunnel bears more uniform force, which can effectively improve the force-bearing form of the tunnel structure. However, blindly adopting a circular cross-section will cause unnecessary economic losses in labor and materials. The curvature of the arch waist and side walls of the railway tunnel section can not only ensure the structural bearing capacity requirements, but also reduce economic costs

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  • A large deformation control method for single-track railway tunnels in soft rock
  • A large deformation control method for single-track railway tunnels in soft rock

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Embodiment Construction

[0062] Such as figure 1 with figure 2 A method for large deformation control of a soft rock single-track railway tunnel is shown, comprising the following steps:

[0063] Step 1. Acquisition of in-situ stress parameters:

[0064] The tunnel detection area is selected in the tunnel section to be constructed, and the in-situ stress test of the tunnel detection area is carried out by using the casing stress relief method to obtain the first principal stress σ 1 , the second principal stress σ 2 , the third principal stress σ 3 ; where the first principal stress σ 1 greater than the second principal stress σ 2 , the first principal stress σ 1 The direction of the second principal stress σ 2 The direction of and the third principal stress σ 3 The directions are perpendicular to each other, the first principal stress σ 1 The angle between the projection on the ground plane and the direction of true north is the first principal stress σ 1 Azimuth α 1 , the first principal...

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Abstract

The invention discloses a large deformation control method of a soft rock single-track railway tunnel, comprising the following steps: 1. acquisition of ground stress parameters; 2. acquisition of rock mass physical and mechanical parameters; 3. acquisition of lateral pressure coefficient and judgment of large deformation of the tunnel ; 4. Establishment of tunnel excavation section model and loading force analysis of tunnel excavation section model; 5. Determination of tunnel excavation section profile; 6. Tunnel step excavation and initial support construction; 8. Circular excavation until the construction of the large deformation section of soft rock is completed. The method of the invention has simple steps, improves the load-bearing performance and deformation resistance capacity of the initial support structure of the tunnel through the optimization of the excavation section profile of the single-track railway tunnel, realizes the control of large deformation of the soft rock single-track railway tunnel, and has strong practicability.

Description

technical field [0001] The invention belongs to the technical field of construction of single-track railway tunnels, and in particular relates to a large deformation control method of soft rock single-track railway tunnels. Background technique [0002] The gravitational force of the earth and the inertial centrifugal force of the rotation cause the internal interaction of the rock mass medium, and the long-term geological tectonic movement influences the tectonic stress formed by the combination of multiple sets of complex effects such as plate transfer load and structural residual stress. The curvature of the side wall of the arch foot in the single-track railway tunnel "thin and high" section design form is small, which can ensure the safety of the primary support structure under the action of conventional stress, but when the surrounding rock is weak and contains high compressive structural stress, the support The structure is prone to deflection and deformation, and wea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21F17/00G06F30/13G06F30/23
CPCE21D9/00E21F17/00G06F30/13G06F30/23
Inventor 李东锋刘千里王建军杨茂杰任强谭忠盛刘普文王建魁杨旸李松涛
Owner SINOHYRDO ENG BUREAU 3 CO LTD
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