Graded coordination strengthening method for broken surrounding rocks in coal roadway driving

Abstract

The invention discloses a coal roadway driving broken surrounding rock grading coordination strengthening method, and relates to the technical field of surrounding rock strengthening. The method comprises the following steps of: firstly, performing advanced pre-grouting on surrounding rocks in front of a heading head during roadway heading, and then lagging the heading head of the current roadway to perform lagging grouting on coal and rock masses near the roadway of an adjacent working face; and finally, supporting design is followed, and surrounding rock is further strengthened. According to the actual situation of the surrounding rock, the surrounding rock of the roadway is coordinated and strengthened in a time-sharing and grading mode through multiple means before and after roadway tunneling, the strength and integrity of the surrounding rock of the broken coal roadway are effectively improved, then the active supporting effectiveness of anchor rods (cables) is improved, and engineering safety is guaranteed.

Description

technical field [0001] The invention relates to the technical field of surrounding rock reinforcement, in particular to a coal roadway excavation broken surrounding rock graded coordinated strengthening method. Background technique [0002] After the excavation of the weak coal and rock mass, timely support is required to improve the bearing capacity of the surrounding rock of the roadway, reduce the deformation and damage of the roadway, and ensure safe production. [0003] However, weak coal bodies are very common. After excavation and exposure, the surface of the rock mass and even a certain distance deep into the surrounding rock are in a very broken state. As a result, the anchor (cable) cannot be effectively anchored in the broken surrounding rock of the excavated roadway. It is difficult to effectively guarantee the safety and stability of the roadway when the surrounding rock stress is carried by the shed and frame beams. At the same time, when the roadway of the ne...

AI Technical Summary

Problems solved by technology

[0003] However, weak coal bodies are very common. After excavation and exposure, the surface of the rock mass and even a certain distance deep into the surrounding rock are in a very broken state. As a result, the anchor (cable) cannot be effectively anchored in the broken surrounding rock of the excavated roadway. It is difficult to effectively guarantee the safety and stability of the roadway when the surrounding rock stress is carried by sheds and frame beams

At the same time, when the roadway of the next working face is excavated along the goaf, the coal and rock mass is already in a very broken state, the safety of the excavation is threatened, and the problem of ineffective support still continues

The coal pillar left in the middle of the two working faces is broken and severely deformed due to internal extrusion, which cannot be effectively reinforced, and the cost of daily maintenance is high

Therefore, after the surrounding rock of this kind of roadway is exposed, there are problems such as poor integrity, no effective support, poor coal pillar stability, low safety, and low economic efficiency.

[0004] The current grouting reinforcement method basically focuses on the excavation of a single roadway, and the excavation of a narrow coal pillar along the goaf is different from the general single roadway excavation. There is secondary disturbance in the surrounding rock, which will further break, and the grouting is difficult to be effective. A set of methods is urgently needed. The effective surrounding rock control technology can effectively coordinate and solve the problem of surrounding rock control in such roadway excavation

Images