A kind of support method and support system for roadway in weakly cemented stratum

Abstract

The invention relates to a roadway support method and support system in weakly cemented strata, especially suitable for weakly cemented stratum rocks in western mining areas, which have the characteristics of low strength, poor cementation, and disintegration when exposed to water, and are affected by excavation disturbances. The damage range is large in a short period of time, accompanied by the phase transition from rock to sand and gravel particles, it is difficult to effectively control and stabilize the traditional anchor-mesh support and anchor-grouting reinforcement. First, the hollow shell is prefabricated, and the shell is installed on the surface of the excavated roadway through the bolt support, and a certain pre-tightening force is applied to the surrounding rock through the bolt; secondly, the expansive grout is injected into the filling bag of the hollow shell. Grout, the expansion of the grouting fluid during the solidification process exerts prestress on the surrounding rock to limit the deformation of the surrounding rock; finally, the full-section grouting and the concrete pouring of the bottom plate are implemented. The method is simple in operation and convenient in construction, and is mainly used in roadway support engineering in weakly cemented strata.

Description

Technical field [0001] The invention relates to a roadway support method in a coal mine, and is particularly suitable for a weak cement layer roadway support method and a support system in a weak cement layer roadway support project in western and northwestern my country. Background technique [0002] Minable coal seams in western and northwestern my country are found in the Jurassic and Cretaceous strata. The rock strata of this type are affected by the diagenetic environment and exhibit the characteristics of low strength, poor cementation, and disintegration when exposed to water. The surrounding rock has large deformation and large damage range. The traditional bolt-net support and bolt-grouting reinforcement methods cannot effectively control the stability of the roadway. The roadway repair rate is high, and the support cost increases substantially, which restricts the safe production of the western and northwest mines. Summary of the invention [0003] In order to solve the a...

AI Technical Summary

Problems solved by technology

[0002] Minable coal seams in the western and northwestern mining areas of my country occur in the Jurassic and Cretaceous strata. Due to the influence of the diagenetic environment, this type of rock has the characteristics of low strength, poor cementation, and water disintegration. Surrounding rocks have large deformations and large damage ranges. The traditional anchor-mesh support and anchor-grouting reinforcement methods cannot effectively control the stability of the roadway. The repair rate of the roadway is high, and the cost of support has increased significantly, which restricts the safe production of mines in the west and northwest.

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