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Method for treating dangerous rock bodies of expressway tunnel entrance

A technology for expressways and dangerous rock masses, which is applied in sheet pile walls, protective equipment, buildings, etc., can solve problems such as affecting the progress of tunnel construction, incomplete removal of dangerous rock masses, and increasing construction costs, so as to improve construction efficiency and economy. Benefit, save construction time, and ensure the effect of safety

Inactive Publication Date: 2018-03-06
ROAD & BRIDGE INT +1
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Problems solved by technology

On the one hand, this construction method increases the construction cost and affects the progress of the tunnel construction. On the other hand, due to the incomplete removal of dangerous rock mass, there are greater safety risks during the tunnel construction and later operation, and there are certain safety hazards.

Method used

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  • Method for treating dangerous rock bodies of expressway tunnel entrance

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Embodiment Construction

[0016] Such as figure 1 Shown, during the construction of the present invention, specifically comprise the following steps:

[0017] Step 1, cleaning of dangerous rocks within the range of the uphill slope at the entrance of the cave:

[0018] Before the excavation of the tunnel entrance, remove the dangerous rock mass within the slope range of the entrance, remove the floating soil and pumice that threaten the construction safety in the slope protection area, and remove the local terrain that is not conducive to construction and installation and affects the normal function of the system after installation ( Local accumulations and protrusions, etc.) are properly trimmed.

[0019] Step 2, spray anchor protection within the range of dangerous rock mass at the entrance of the cave:

[0020] According to the design drawings, after the bolt holes are drilled and grouted, 10cm-thick shotcrete is used to protect the range of the slope to ensure the stability of the slope before th...

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Abstract

The invention provides a method for treating dangerous rock bodies of an expressway tunnel entrance. The method for treating the dangerous rock bodies of the expressway tunnel entrance comprises the following steps of clearing the dangerous rock bodies within a tunnel entrance slope range before the excavation of the tunnel entrance; carrying out spray anchor protection within the tunnel entrancedangerous rock body range according to a design drawing; arranging a passive protection net within the dangerous rock body range at a slope position above the tunnel entrance so as to effectively protect against loose rockfalls caused by blasting disturbance, weather reasons and geological reasons on the upside in the main tunnel construction process; and after the geological condition within theslope dangerous rock body range is comparatively stable, implementing an active protection net within the dangerous rock body range by using an anchoring rod of shotcrete-bolt support so as to furtherincrease safety coefficients of tunnel construction period and operational period.

Description

technical field [0001] The invention relates to the technical field of tunnel construction and protection, in particular to a method for disposal and protection of dangerous rock masses on the side slopes at the entrances of highway tunnels. Background technique [0002] The treatment of the dangerous rock mass on the side slope above the entrance of the expressway mountain tunnel is related to the safety of the tunnel construction and operation period. At present, most of the treatment methods for the dangerous rock mass above the tunnel entrance adopt an extended open hole and the removal of dangerous rock mass as the main control measures. On the one hand, this construction method increases the construction cost and affects the progress of the tunnel construction. On the other hand, due to the incomplete removal of dangerous rock mass, there are greater safety risks during the tunnel construction and later operation, and there are certain safety hazards. Contents of the...

Claims

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Application Information

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IPC IPC(8): E01F7/04E02D5/74
CPCE01F7/045E02D5/74
Inventor 薛海璞田连民谢俊峰王笑谭文明
Owner ROAD & BRIDGE INT
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