Permanent supporting method of weak cementation soft rock roadway

Abstract

The invention discloses a permanent supporting method of a weak cementation soft rock roadway; the roadway is excavated under advanced temporary supporting; after excavation, first anchor mesh spray joint supporting is carried out, and the supporting is called as primary supporting; anchor rope secondary supporting is carried out after the primary supporting; in the anchor rope secondary supporting, an anchor rope hole being 5m to 8m is punched on an arch top of the roadway vertical to a rock surface; a steel strand with the diameter being phi 12mm to 16mm is arranged in an anchor rope hole; the depth of an anchoring section of the steel strand needs to be more than 1m; reinforcing supporting is carried out after the anchor rope secondary supporting; and in the reinforcing supporting, U-shaped steel telescopic supports are adopted, and the spacing between the supports is 800mm. According to the permanent supporting method of the weak cementation soft rock roadway, a supporting effect of the weak cementation soft rock roadway is enhanced, the deformation of the weak cementation soft rock roadway is overcome, and the safe production of a coal mine is ensured.

Description

technical field [0001] The invention relates to a roadway support method. Background technique [0002] Roadway support is divided into temporary support and permanent support. At present, in the permanent support of the underground roadway of coal mine, the combined support method of anchor, screen and shotcrete is generally used. This method is suitable for the situation of ordinary rock formations. At present, during the excavation of underground roadways in coal mines (especially Shimen), it is often encountered that the roadway passes through weakly cemented soft rock. There is obvious deformation increase phenomenon, the deformation amount reaches more than 500mm, and the deformation of the two sides is also 300mm, and the deformation rate reaches 11mm / d, which exceeds the limit deformation allowed by the general bolt support; at the same time, it occurs under the bolt support. It is difficult to achieve the support effect because of the tray invagination phenomenon....

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor support effect of existing weakly cemented soft rock roa