Method for reinforcing roadway floor by grouting

Abstract

The invention discloses a method for reinforcing a roadway floor by grouting in the way that the roadway floor is buried before the grouting, which is suitable for supporting projects of roadways in coal mines. The method comprises the following steps of: excavating the roadway floor during the excavation of a roadway to form a reverse arch; constructing a plurality of grouting drill holes at equal intervals along the section of the reverse arch perpendicular to the camber lines of the reverse arch respectively; arranging a special grouting tube with a hose for the floor in the grouting drill hole; filling the bottom of the arch with crushed waste rocks or cement and ensuring that the outer end head of the grouting hose is exposed from the plane of the floor; after the excavated working surface moves forwards for a certain distance, guniting and sealing the floor; and performing grouting operation on each pre-buried grouting tube through the grouting hose by connecting the exposed grouting hose with a grouting pump. The method not only avoids the reverse arch during secondary excavation of the floor, but also solves the problem that the grouting construction is interactional with the construction of the excavation working surface; the pre-buried grouting tube is easy to protect and the exposed part of the grouting tube after the grouting is easy to process; and the method can obviously improve the grouting depth, increase the bearing range for the loose and crushed rock stratum of the floor and improve the deformation resistance capacity of the floor .

Description

technical field [0001] The invention relates to a grouting reinforcement method for the bottom plate of a roadway, which is buried first and then injected, and is especially suitable for the reinforcement grouting of the bottom plate in the severe deformation zone of the coal mine roadway engineering bottom plate. Background technique [0002] During the mining of shallow coal seams, the roadway surrounding rock control process often does not reinforce the floor, but leaves it as a free surface to release stress. The undercut is deformed, and the undercut of the dynamic pressure roadway even reaches more than 1000mm, which seriously affects the normal use of the roadway. In order to reduce the deformation of the floor and improve the bearing capacity of the floor rock, many mining areas and related research institutes have launched research on the control technology of the roadway floor. [0003] In the existing research results, the strengthening technology of the floor is...

AI Technical Summary

Problems solved by technology

The method of timely grouting can make full use of the anti-arch space formed in the initial stage of the excavation face, avoiding the workload of secondary excavation and anti-arch required by delayed grouting, and the damage to the transportation route. However, due to the grouting process All necessary processes must be concentrated on the excavation face, which seriously affects the development of the normal excavation process, resulting in slow advancement of the excavation face, which greatly restricts the progress of the excavation construction

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