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Underground cavern top arch shallow surface layer surrounding rock low-pressure grouting method

A technology for underground caverns and shallow surfaces, applied in underground caverns, earthwork drilling, shaft equipment, etc., can solve the problem of weakening the integrity and bearing capacity of surrounding rock itself, expanding the relaxation circle of surrounding rock, and threatening the safety of underground caverns To improve the stress transfer performance and maintain the bearing capacity

Pending Publication Date: 2022-08-05
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology

[0002] During the excavation period and after the completion of the excavation, the top arch of the underground cavern can maintain the stability of the top arch by relying on the integrity and bearing capacity of the surrounding rock itself. The adjustment leads to loosening and cracking of the shallow surrounding rock, weakening the integrity and bearing capacity of the surrounding rock, and even causing the relaxation circle of the surrounding rock to further expand to the deep, threatening the overall safety of the underground cavern

Method used

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  • Underground cavern top arch shallow surface layer surrounding rock low-pressure grouting method

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Embodiment Construction

[0019] The present embodiment is a low-pressure grouting method for the surrounding rock of the shallow surface layer of the top arch of an underground cavern, which specifically includes the following steps:

[0020] S1. Before low-pressure grouting, all support measures for the location where low-pressure grouting is to be carried out on the top arch of the underground cavern shall be completed.

[0021] S2. Complete the grouting hole setting and opening of the corresponding parts of the top arch of the underground cavern. The grouting hole should be set out accurately, and the relative position with the constructed anchor cable and monitoring instrument should be reviewed before opening to avoid damage to the original anchor cable and monitoring equipment. The site is based on the principle of uniform arrangement, mutual staggering, and no damage to monitoring instruments. Effective measures must be taken in drilling to improve drilling accuracy and avoid excessive drillin...

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Abstract

The invention relates to a low-pressure grouting method for shallow surface layer surrounding rock of an underground cavern top arch. According to the technical scheme, the low-pressure grouting method for the shallow surface layer surrounding rock of the top arch of the underground cavern is characterized in that supporting measures of corresponding parts of the top arch of the underground cavern are completed before low-pressure grouting; grouting hole site lofting and trepanning at the corresponding part of the top arch of the underground cavern are completed; all the grouting holes are divided into I-sequence grouting holes for first grouting and II-sequence grouting holes for later grouting, sequential grouting is carried out according to the principle of gradual densification, a full-hole one-time grouting method is adopted, and stop-grouting plugs are arranged at openings of the grouting holes; grouting materials of the I-sequence grouting holes are ordinary Portland cement, the water-cement ratio of the ordinary Portland cement has multiple levels, and when the injection rate is larger than a preset value, grout with the water-cement ratio concentrated by one level is adopted for grouting; superfine cement is adopted as a grouting material of the II-sequence grouting holes, the water-cement ratio of the superfine cement has multiple levels, and when the injection rate is larger than a preset value, grout with the water-cement ratio being one level thick is adopted for grouting.

Description

technical field [0001] The invention relates to a low-pressure grouting method for the surrounding rock of the shallow surface layer of the top arch of an underground cavern. It is suitable for the shallow surrounding rock of the top arch of the underground cavern under the action of high in-situ stress or unfavorable geological structure. Background technique [0002] The top arch of the underground cavern can maintain the stability of the top arch by relying on the integrity and bearing capacity of the surrounding rock during and after the excavation. However, under the action of high ground stress or unfavorable geological structure, the surrounding rock stress of the top arch will continue. The adjustment will lead to the relaxation and rupture of the superficial surrounding rock, weaken the integrity and bearing capacity of the surrounding rock, and even cause the relaxation circle of the surrounding rock to further expand to the deep, threatening the overall safety of ...

Claims

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Application Information

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IPC IPC(8): E21D11/10
CPCE21D11/105Y02E10/20
Inventor 赵修龙万祥兵方丹李良权补约依呷陈鹏邵兵陈登义王宽
Owner POWERCHINA HUADONG ENG COPORATION LTD
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