Low-permeability rock mass presplitting grouting long anchor cable construction method

By performing pre-cracking and forced grouting technology in low permeability rock mass, the problem that conventional grouting methods cannot effectively diffuse the slurry, the cementation and stress state of the surrounding rock are improved, and the anchoring force is improved.

CN120083544APending Publication Date: 2025-06-03CHINA MINMETALS CHANGSHA MINING RES INST +1
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Patent Information

Application Number
CN202510341804.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-21
Publication Date
2025-06-03

AI Technical Summary

Technical Problem

When supporting the crushed rock mass with low permeability, the conventional grouting anchor cable construction method cannot effectively diffuse the slurry, resulting in poor grouting effect, unable to improve the stress state of the surrounding rock, and unable to fundamentally consolidate the broken surrounding rock.

Method used

Pre-cracking blasting technology is used to create cracks in the rock mass, and forced grouting is carried out simultaneously through pre-cracking holes and anchor cable holes to increase the permeability range of the slurry and improve the integrity and stress state of the surrounding rock.

Benefits of technology

Through pre-cracking blasting and forced grouting technology, the permeability range of slurry in the rock is improved, the cementity and integrity of the surrounding rock is enhanced, the stress state of the surrounding rock is improved, and the anchoring force is improved.

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Abstract

The invention discloses a low-permeability rock mass presplitting grouting long anchor cable construction method. The method comprises the steps that S1, a rock drilling roadway is excavated in the upper portion of a to-be-supported area; s2, presplitting holes are excavated from the rock drilling roadway to the lower middle section of the to-be-supported area; s3, a fan-shaped anchor cable hole is constructed in surrounding rock of the area to be supported, and an anchoring agent is installed at the bottom of the hole; s4, hollow grouting anchor cables are anchored and installed in the anchor cable holes; s5, a stop-grouting plug is installed in the anchor cable hole, and a tray and a lock of the anchor cable are installed; s6, pre-splitting blasting is conducted on the pre-splitting hole, and then a grouting hole and a stop-grouting plug are installed in the empty hole; s7, grouting holes formed in empty holes of the anchor cable hole and the pre-splitting hole are used for grouting in the holes at the same time, and then the grouting holes are blocked through screwed plugs; according to the application, the permeation range of the slurry in the rock is enlarged, so that the integrity of the rock mass is improved through grouting, and the stress state of the rock mass is improved; the grouting anchor cable construction quality of the low-permeability rock mass can be improved, and the permeation range of grout in surrounding rock is widened.
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