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A design method and system for tunnel secondary lining based on safety reserve factor
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A secondary lining and safety reserve technology, applied in geometric CAD and other directions, can solve the problems of material waste and large thickness
Active Publication Date: 2020-12-08
BEIJING JIAOTONG UNIV
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Problems solved by technology
However, the current method of determining the thickness of the secondary lining is still based on engineering experience, often resulting in too conservative and resulting in excessive thickness, resulting in a large waste of materials
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Embodiment 1
[0101] figure 1 It is a method flow chart of the tunnel secondary lining design method based on the safety margin factor in Embodiment 1 of the present invention.
[0102] see figure 1 , the tunnel secondary lining design method based on the safety reserve factor, including:
[0103] Step 101: Obtain tunnel surrounding rock and support parameters from site geological survey and preliminary design data.
[0104] Step 102: According to the surrounding rock and support parameters of the tunnel, determine the stress of the secondary lining at different spatial positions on the tunnel contour line during the deformation process of the surrounding rock, and obtain the stress of the secondary lining at different spatial positions under the influence of deformation. The first force curve.
[0105] This step 102 specifically includes:
[0106] A: Create a stress model of the secondary lining at different spatial positions on the tunnel contour line during the deformation of the sur...
Embodiment 2
[0198] The scheme of the present invention is described in detail by taking a certain tunnel as an example.
[0199] 1) The first force curve:
[0200] The excavation radius of a tunnel is R=6m, the buried depth of the tunnel is h=150m, and the average weight of the overlying stratum is γ=20kN / m 3 , the lateral pressure coefficient is λ=0.6; the elastic modulus of the surrounding rock is E=0.8Gpa, Poisson’s ratio is μ=0.35; the initial support thickness is t 1 = 0.2m, composed of shotcrete and grid steel frame, the grid arch frame is a square section with 4 legs of 160mm×160mm, the main reinforcement is φ22 steel bar, the spacing is 0.6m, the shotcrete grade is C25, and the initial support is applied The distance from the palm face is x 1 = 4m; C30 plain concrete is used for the secondary lining, and the distance from the face of the tunnel is 28m during construction. At this time, the deformation of the surrounding rock is basically stable. According to engineering experie...
Embodiment 3
[0217] Taking a certain tunnel of the Guizhou-Guangzhou high-speed railway as an example, the scheme of the present invention is checked and calculated.
[0218] The tunnel is a key control project of the Guizhou-Guangzhou high-speed railway, and the tunnel generally runs from northwest to southeast. The tunnel site is located in the denuded hilly area. The excavation span of the tunnel is 14.7m, the vertical height is 12.5m, and the excavation area is 150m 2 , using the equivalent area method to approximate it as r 0 = 6.9m circular chamber. The buried depth of the tunnel is H=15.7m, and the average bulk density of the floating rock and soil layer is γ=21kN / m 3 , according to the site stress measurement results, it can be known that the lateral pressure coefficient λ = 0.5. The tunnel adopts a composite support structure, the initial support is 30cm thick C25 shotcrete, and the I-22a steel frame, with a spacing of 0.6m / m. 55cm thick C35 reinforced concrete, the distance f...
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Abstract
The invention discloses a tunnel secondary lining design method and a system based on a safety reserve coefficient. The method comprises the steps of obtaining tunnel surrounding rock and supporting parameters; determining the stress condition of the secondary lining in the surrounding rock deformation process at different spatial positions on the tunnel contour line according to the tunnel surrounding rock and the support parameters, and obtaining a first stress curve of the secondary lining at different spatial positions under the deformation influence; performing limit stress calculation onthe secondary lining according to the material strength of the secondary lining, and obtaining a second stress curve of the secondary lining under the limit stress condition; determining the most unfavorable load position of the secondary lining according to the spatial position corresponding to the point, located on the outer side of the second stress curve and deviated from the farthest position of the second stress curve, of the first stress curve; and according to the position of the point corresponding to the position of the most unfavorable load in the second stress curve, determining the minimum thickness of the position of the most unfavorable load under a preset safety reserve coefficient by utilizing a dichotomy. According to the method and the system, waste of engineering materials can be avoided.
Description
technical field [0001] The invention relates to the field of tunnel engineering, in particular to a tunnel secondary lining design method and system based on a safety reserve factor. Background technique [0002] At present, most mountain tunnels adopt a composite lining structure, which is composed of primary support and secondary lining. The primary support is used as the main bearing structure, and the secondary lining is used as a safety reserve. It is usually installed after the deformation of the surrounding rock is basically stable. However, the current method of determining the thickness of the secondary lining is still based on engineering experience, which is often too conservative and leads to excessive thickness, resulting in a large waste of materials. Contents of the invention [0003] The purpose of the present invention is to provide a tunnel secondary lining design method and system based on the safety reserve factor, to determine the minimum thickness of ...
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