High-ground-stress weak surrounding rock tunnel excavation construction method
A technology for tunnel excavation with weak surrounding rock, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of complex determination of tunnel reserved deformation, difficulty in achieving ideal results, complex geological conditions of tunnels, etc., and achieve practical High value, good use effect, reasonable design effect
Active Publication Date: 2016-02-24
CHINA RAILWAY 20 BUREAU GRP +1
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[0013] For railways, tunnel excavation construction mainly considers the reserved deformation, construction error and allowable overbreak, and the construction error and allowable overbreak are generally determined based on the experience of the construction unit; the determination of the reserved deformation of the tunnel is relatively complicated
At present, there are no mature theoretical results to determine the reserved deformation for soft rock large deformation tunnels under high and extremely high ground stress conditions. However, when using the engineering analogy method, the geological conditions of such tunnels are extremely complex, and the properties of surrounding rocks vary widely. Different ground stress conditions make it difficult to achieve ideal results
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[0041] Such as figure 1 The excavation construction method of a tunnel with high ground stress and weak surrounding rock is shown. Along the longitudinal extension direction of the tunnel, the tunnel with weak surrounding rock is excavated in multiple sections from the back to the front; The excavation construction methods are the same; when excavating any section of the tunnel with weak surrounding rock, the following steps are included:
[0042] Step 1. Test of rock mass strength and maximum internal stress of surrounding rock: before excavation of the current construction segment, the rock mass strength Rb of the surrounding rock of the current construction segment and the maximum internal stress σ of the surrounding rock max test separately;
[0043] Step 2. Determination of the extrusion-type large deformation grade of the surrounding rock: According to the rock mass strength Rb and the maximum in-situ stress σ obtained from the test in Step 1 max , to calculate the str...
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The present invention discloses a high-ground-stress weak surrounding rock tunnel excavation construction method. A weak surrounding rock tunnel under construction is excavated and constructed by multiple segments from back to front along a tunnel lengthwise extension direction. The method comprises a first step of rock mass strength and surrounding rock internal maximum ground stress testing; a second step of surrounding rock extrusion-type large deformation level determination; a third step of tunnel deformation allowance determination, determining the deformation allowance according to a determined extrusion-type large deformation level; a fourth step of tunnel excavation construction, carrying out excavation construction on the current constructed segment according to the determined deformation allowance; a fifth step of carrying out excavation construction on the following segment; and a sixth step of repeating the fifth step till a tunnel excavation construction process is completed. The method provided by the present invention is simple in procedure, reasonable in design, convenient to construct and excellent in using effect, the tunnel excavation deformation allowance is determined according to the high-ground-stress weak surrounding rock extrusion-type large deformation level, the tunnel excavation construction process can be conveniently and quickly completed, and the construction process is safe and reliable.
Description
technical field [0001] The invention belongs to the technical field of tunnel excavation construction, and in particular relates to an excavation construction method for a tunnel with high ground stress and weak surrounding rock. Background technique [0002] Tunnel excavation will inevitably lead to the redistribution of the original stress of the surrounding rock. The mechanical behavior of the stress redistribution of the entire surrounding rock can be generalized as the following process: balance. "Looseness" and "looseness" are two completely different concepts in describing the process of stress redistribution, and the manifestations of surrounding rock loads in these two processes are also different. The load generated in the "relaxation" stage is called "deformation pressure". At this time, the reduction of the stress level of the surrounding rock and the deformation of the surrounding rock coexist. From the perspective of rock mechanics, the surrounding rock at thi...
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IPC IPC(8): E21D9/00E21D9/14
CPCE21D9/00E21D9/14
Inventor 任少强王平安谢江胜冀胜利谭忠盛崔文镇杨文宣杨星智
Owner CHINA RAILWAY 20 BUREAU GRP
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