Calculation method for determining the stability of the tunnel face under different water-rich degrees and footage
A calculation method and technology of the face, which can be used in earth-moving drilling, mining equipment, mining devices, etc., and can solve problems such as failure to meet practical needs.
Active Publication Date: 2019-04-16
HUNAN UNIV OF SCI & TECH
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Problems solved by technology
This cannot meet the actual needs of many water-rich strata and underwater tunnel construction in our country.
Method used
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[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0047] see figure 1 , the present invention determines the calculation method for the stability of the tunnel face under different water-rich degrees and footage, and the specific steps are as follows:
[0048] First of all, according to the general situation of the tunnel project and the grade of the surrounding rock, obtain the relevant mechanical parameters of the surrounding rock and the geometric parameters of the tunnel excavation, such as the cohesion c, internal friction angle φ, tunnel buried Depth C, footage L, tunnel excavation height D, surrounding rock gravity γ, etc.
[0049] Then calculate as follows:
[0050] (1) According to the geometric relationship between the tunnel excavation height and footage, etc., determine the relevant size relationship as follows:
[0051]
[0052]
[0053] When h-C≤0, that is, the damage range of the surr...
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The invention discloses calculation for determining stability of a tunnel face under different water abundance and footage. According to the calculation, power of surrounding rock gravity, power of support force and energy dissipation power of a fracture surface are calculated respectively according to conditions such as the water abundance of surrounding rock, size of an excavated section of a tunnel, footage and the like, a support force expression containing the footage is solved according to the principle of conservation of energy, then parameters of the surrounding rock are subjected to reduction in combination with a strength reduction method, the support force is enabled to be zero, and at the moment, a reduction factor is the coefficient of stability of the tunnel face; the footage and the water abundance are changed, and the stability of the tunnel face under different footage and water abundance can be obtained. A calculation method is provided for determining the stability of the tunnel face under different water abundance and footage, and on the basis of the method, whether excavation footage is reasonable can be judged, and the safety of the tunnel face under different water abundance can be evaluated; the support force required for maintaining the stability of the tunnel face can be obtained, so that reference is provided for support and reinforcement of the tunnel face.
Description
technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a calculation method for determining the stability of tunnel faces under different water-rich degrees and footage. Background technique [0002] The stability problem is an important and basic research content of tunnel and underground engineering, which mainly involves two aspects of surrounding rock and supporting structure, and the stability of the surrounding rock itself, especially the surrounding rock near the excavation face, is particularly important. Construction is impossible if the face of the face is unstable. In tunnel engineering, geology is decisive, and water (groundwater and surface precipitation, etc.) aggravates the damage of the tunnel face. The "ten collapses and nine waters" of the tunnel can explain the problem. The stability of the surrounding rock near the face of the tunnel is the key problem and the core control factor in the cu...
Claims
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IPC IPC(8): E21F17/00
CPCE21F17/00
Inventor 安永林欧阳鹏博岳健胡文轩
Owner HUNAN UNIV OF SCI & TECH