Tunnel entering construction method for stabilizing mountain under large unsymmetrical pressure terrain
A construction method and mountain technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve problems such as tunnel cracking and deformation, and achieve the effects of controlling mountain deformation, protecting safe construction, and preventing force cracking and deformation
Pending Publication Date: 2022-03-25
GUANGXI ROAD CONSTR ENG GRP CO LTD +1
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Problems solved by technology
[0009] The purpose of the present invention is to provide a tunnel entry construction method for stabilizing the mountain under large bias terrain, which solves the problem of safe and reliable construction of tunnel entry excavation under bias geological conditions, and has the ability to prevent the tunnel from being squeezed by the surrounding rock. Cracking and deformation, preventing the slide of the mountain from endangering the safety of the tunnel, preventing the occurrence of tunnel settlement and other phenomena, greatly improving the construction safety of tunnel entry under large bias terrain
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Embodiment 1
[0058] A tunnel entry construction method for stabilizing mountain bodies under large bias terrain, comprising the following steps:
[0059] (1) Foundation and anti-skid treatment
[0060] (1-1) Clear the surface of the mountain with large bias pressure, level the site, and then use the leveled site to drill holes with down-the-hole drilling. During the drilling process, root canal drilling or pre-grouting can be used according to the collapse of the hole post-drilling measures;
[0061] (1-2) Use pressure pouring cement mortar or fine stone concrete to pour into the hole to form anti-slip micro piles;
[0062] (1-3) Remove the pile head not less than 50cm from the top of the anti-sliding micro pile, expose the steel pipe and steel tendon, and lay a layer of steel mesh on the top of the pile head;
[0063] (1-4) Embed the connecting steel bars between the counter-pressure concrete and the cap, and pour the concrete cap;
[0064] (2) Mountain back pressure
[0065] (2-1) Co...
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The invention particularly relates to a tunnel entering construction method for stabilizing a mountain under a large bias terrain. The method comprises the following steps: carrying out foundation and anti-skid treatment; massif back pressure; according to the construction method, safe and reliable construction of tunnel entering excavation under the unsymmetrical pressure geological condition is achieved, and the construction method has the advantages that tunnel cracking and deformation caused by the fact that the tunnel is squeezed by surrounding rock can be prevented, the situation that the safety of the tunnel is endangered due to the fact that a mountain slides downwards is prevented, and the construction efficiency is improved. And the phenomena of tunnel settlement and the like are prevented, and the construction safety of tunnel entering under the large bias terrain is greatly improved.
Description
technical field [0001] The invention relates to the technical field of tunnel building construction, in particular to a tunnel entry construction method for stabilizing mountain bodies under large bias terrain. Background technique [0002] Biased tunnel refers to the obvious inhomogeneity of the surrounding rock pressure due to objective reasons, which will have an adverse effect on the support and construction of the tunnel under the action of biased loads. The impact of the bias phenomenon on the tunnel is usually reflected in the following aspects: 1. The influence on the stress of the tunnel lining structure: if the tunnel has a bias phenomenon, the load acting on the tunnel lining must be asymmetrical, which is extremely It is easy to cause shear failure of the lining structure, especially the bias caused by terrain and geological factors, which will have a greater impact on the tunnel structure system. Bias pressure is the main cause of lining cracks at the tunnel en...
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IPC IPC(8): E21D9/00E21D11/00E21D11/10
CPCE21D9/00E21D9/001E21D11/003E21D11/10
Inventor 周祥郑寰宇梁露谭傢元胡杰陈信朋潘志军赵飞龙罗伟锋李诚张观树宋伟郭懿邵羽王鸣冠
Owner GUANGXI ROAD CONSTR ENG GRP CO LTD