Shallow reinforcement and deep injection supporting method for rapid excavation of broken roof large-section roadways

Abstract

The invention discloses a shallow reinforcement and deep injection supporting method for rapid excavation of broken roof large-section roadways. The shallow reinforcement and deep injection supportingmethod comprises the following steps: (1) a shallow part glue-injecting reinforcing process is carried out, specifically, glue-injecting operation of shallow part drill holes is conducted on the broken roofs in the roadways, the multiple shallow part drill holes subjected to glue-injecting operation form shallow part glue-injected areas of the broken roofs in the roadways, and after grace glue-injecting materials in the shallow part glue-injected areas are solidified, shallow part reinforcing is conducted on the broken roofs; and (2) a deep part anchorage and injection integrated constructionprocess is carried out, specifically, after the grace glue-injecting materials in the shallow part glue-injected areas are completely solidified, high-pressure grouting operation of left anchor rod drill holes and right anchor rod drill holes is conducted on left roadway sides and right roadway sides in the roadways, and then high-pressure grouting operation of top anchor rod drill holes and anchor cable drill holes is conducted on the broken roofs in the roadways successively. The excavated broken roof large-section coal roadways and rock roadways can be effectively supported in time, the effect of supporting operation and the supporting strength are improved.

Description

technical field [0001] The invention belongs to the technical field of roadway support in underground coal mines, and in particular relates to a shallow-solid deep injection support method for rapid excavation of a large-section roadway with a broken roof. Background technique [0002] my country's coal mining is extending to the deep at a speed of 8-12m / a. In the process of deep mining, many unfavorable factors also follow, such as: high ground temperature, high pressure karst water, high gas pressure and high ground stress. become very prominent. At the same time, the mining pressure in the underground has become more severe, the roof has been broken more seriously, and the support of the roadway is very difficult, especially for large-section roadways in the underground. Repeated expansion will not only affect the driving speed of the roadway, but also have a serious impact on the safe production of the coal mine. [0003] In coal mines, deep broken soft rock roadways ar...

AI Technical Summary

Problems solved by technology

Practice has shown that ordinary anchor rods or ordinary anchor cables are sometimes difficult to meet the support requirements of large deformation and high ground stress in soft rock roadways, and sometimes anchoring failures and support failures occur; U-shaped steel shrinkable supports Its own shrinkage is limited, and it will be damaged when the compression amount is very small. However, the buffer layer filled behind the wall by the high-strength concrete arc plate support does not match the construction of the reserved deformation layer, and sometimes it cannot adapt to the surrounding rock. Deformation law; the advantages of joint support are obvious, but the advantages and disadvantages of each support method should be fully considered, and the advantages and disadvantages should be complementary to improve the effect of roadway support

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