Support method of sharp inclined seam roadway

Abstract

The invention discloses a support method of a sharp inclined seam roadway. The support method includes the steps that firstly, anchor bolt support is performed, when the roadway is excavated, tunnel face dangerous rocks are removed, an anchor rod installation position is arranged in the direction perpendicular to the inclination of a seam, drilling is performed in the radial direction of the roadway with a drilling machine, and an anchor rod is installed; secondly, spraying net support is performed, a reinforcing mesh is hung on the periphery of a roadway hole and is firmly welded to the anchor rod and an anchor cable; thirdly, roadway bottom arch anchor spraying mesh support is performed, after a bottom arch is excavated according to a designed section, the reinforcing mesh is hung again, and whitewashing support is performed; fourthly, U-shaped steel closing and looping support is performed, U-shaped steel is closed to form a loop, the bottom-body-top mounting sequence is adopted, four pieces of U-shaped steel are symmetrically installed and connected into the loop, and the bottom U-shaped steel and the body U-shaped steel are in lap joint and controlled at the arch waist part; fifthly, base plate backfilling is performed, after backfilling, the base plate is flat, the front gradient and the rear gradient are consistent, and a rail is firmly padded and cannot be suspended. The support method of the sharp inclined seam roadway is simple and convenient to conduct, operation is simple, the effect is obvious, and cost is low. A support structure is safe and reliable, generated surrounding rock plastic yielding area is reduced by more than 70 percent or more compared with a conventional support, and long-term safety and stability of the roadway support structure are ensured.

Description

technical field [0001] The invention relates to the technical field of construction of a coal seam roadway in a coal mine, and more particularly relates to a support method for a steeply inclined coal seam roadway, which is suitable for supporting a steeply inclined coal seam with large deformation and stratum bias. Background technique [0002] The surrounding rock medium of the steeply inclined coal seam roadway is generally highly heterogeneous and discontinuous, and there are many joints and fissures, which make the surrounding rock have asymmetric deformation and uneven load on the support body. After the roadway is excavated, it is easy to The strata are shifted, the deformation height is asymmetrical, and the phenomena of roof caving and bottom swaying are extremely prominent, especially the unstable coal seam at the top of the roadway, which greatly increases the complexity and difficulty of the support work. The steeply inclined coal seam roadway is basically suppo...

AI Technical Summary

Problems solved by technology

[0002]The surrounding rock medium of steeply inclined coal seam roadway is generally highly heterogeneous and discontinuous, and there are many joints and fissures, which make the surrounding rock have asymmetric deformation and Due to the uneven loading of the support body, after the excavation of the roadway, it is easy to have the characteristics of stratum mutual displacement and asymmetric deformation height, and the phenomena of roof caving and bottom sag are extremely prominent, especially when the top of the roadway is an unstable coal seam, which greatly increases The complexity and difficulty of the support work

The steeply inclined coal seam roadway is basically supported by traditional U-shaped steel retractable brackets or I-shaped steel brackets, but the steel brackets are generally not closed into a ring, and the bottom arch is not specially supported, and the choice of support methods is very difficult. To a large extent, it relies on experience, the design is blind and conservative, and the support effect is not good. more security risks

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