Surrounding rock high-pressure gas multi-stage pre-splitting grouting reconstruction method and reconstruction device of deep soft rock roadway

A technology of high-pressure gas and high-pressure air, which is applied in the direction of tunnels, mining fluids, tunnel linings, etc., can solve problems such as poor injectability and poor grouting effect, and achieve outstanding effects, high on-site direct application value, transformation and structure and The effect of mechanical properties

Active Publication Date: 2017-04-05
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to effectively solve the problems of closed cracks in the surrounding rock of deep soft rock roadways, extremely poor injectability, and poor grouting effects, and realize stable control of deformation of surrounding rocks in deep soft rock roadways, the present invention designs a surrounding rock of deep soft rock roadways High-pressure gas multi-stage pre-cracking grouting reconstruction method and its reconstruction device. This method can generate a large number of cracks inside the weak surrounding rock of the roadway, and maintain a certain opening degree of the cracks for a long time, effectively improving the quality of the surrounding rock. Injectability, improve the effect of surrounding rock grouting reinforcement, realize significant transformation of the surrounding rock structure and mechanical properties of deep soft rock roadways, and achieve the purpose of controlling the stability of deep soft rock roadway surrounding rocks

Method used

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  • Surrounding rock high-pressure gas multi-stage pre-splitting grouting reconstruction method and reconstruction device of deep soft rock roadway
  • Surrounding rock high-pressure gas multi-stage pre-splitting grouting reconstruction method and reconstruction device of deep soft rock roadway
  • Surrounding rock high-pressure gas multi-stage pre-splitting grouting reconstruction method and reconstruction device of deep soft rock roadway

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Embodiment 1

[0055] Example 1: A mine in Shandong Province mainly mines 3 coals, the average thickness of which is 7.78m, and fully mechanized caving mining is used to mine full height at one time. The -650 level south wing roadway is the horizontal development roadway of the mine. Due to the influence of the fault structure, the roadway passes through multiple mudstone layers during the excavation process. The buried depth of the main road is about 700m, the section shape is a straight wall and semicircular arch, the wall height is 1.8m, the arch height is 2.4m, and the clear width is 4.8m. Initially, anchoring and grouting support is used as permanent support. Since the cracks in the surrounding rock of the roadway are not developed, and the existing cracks are closed under the action of the ground stress, the grouting effect is very poor. Three months after the construction of the roadway, the deformation and damage were serious, and the section of some sections shrank by more than 80%....

Embodiment 2

[0065]Example 2: The floor elevation of a three-level roadway in a mine in Huaibei is -1000m, the roadway is located on the 10th coal floor, and the lithology is siltstone and mudstone. Affected by the deep high ground stress, the surrounding rock of the roadway is seriously deformed and damaged. The shape of the cross-section is a straight wall semi-circular arch, with a wall height of 1.8m, an arch height of 2.35m, and a clear width of 4.7m. Initially, anchoring and grouting support is used as permanent support. On-site detection shows that the roadway surrounding rock joints and fissures are well developed, but under the action of high in-situ stress, most of the fissures are closed, and the effect of grouting reinforcement is not good.

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Abstract

The invention relates to a high-pressure gas multistage pre-splitting grouting transformation method for surrounding rock of deep soft rock roadways. The high-pressure gas multistage pre-splitting grouting transformation method has the advantages that the surrounding rock of the deep soft rock roadways is subjected to multistage pre-splitting by the aid of high-pressure gas, special propping agent materials are added into popping agent containers when last-stage gas pre-splitting is carried out, the particle sizes of the propping agent materials are larger than those of cement particles, the propping agent materials are used for propping crack of the artificially pre-split expanded surrounding rock, the crack can be prevented from being closed again under the effect of deep high ground stress, the groutability of the surrounding rock can be improved, then the surrounding rock with the crack can be grouted and reinforced, weak surrounding rock structures and mechanical properties of the roadways can be greatly transformed, the surrounding rock of the deep soft rock roadways can be stably controlled, and difficult problems of closing of crack of existing surrounding rock of existing deep soft rock roadways, extremely poor groutability of the existing surrounding rock and poor grouting effects can be solved; the weak surrounding rock structures and the mechanical properties can be obviously transformed and enhanced, and the bearing capacity of the surrounding rock can be improved; high-pressure gas pre-splitting holes and grouting holes of the surrounding rock are combined with one another, and the high-pressure gas multistage pre-splitting grouting transformation method is easy to operate and implement in fields.

Description

technical field [0001] The invention relates to roadway support technology, in particular to a multi-stage pre-cracking grouting transformation method and a transformation device thereof, belonging to the field of mining engineering. Background technique [0002] Deep soft rock roadways are usually in the complex mechanical environment of "three highs and one disturbance" characterized by high ground stress, high osmotic pressure, high temperature and strong mining disturbance. It is extremely difficult to control the deformation of surrounding rock, which has brought a serious threat to the safe and efficient mining of coal mines in my country for a long time. At present, for such roadways at home and abroad, U-shaped steel shrinkable metal brackets and anchor-grouting reinforcement are usually used for support. Among them, anchor-grouting support that can improve the structure and mechanical properties of weak surrounding rocks in deep roadways is widely used. [0003] A l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21B43/267
Inventor 陆银龙蒋邦友王连国孙小康
Owner CHINA UNIV OF MINING & TECH
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