Supporting method for underground soft rock roadway of coal mine

Abstract

The invention provides a supporting method for an underground soft rock roadway of a coal mine. The supporting method for the underground soft rock roadway of the coal mine is characterized by comprising the following steps of (1) supporting through an anchor net, specifically, after the roadway is tunneled or expanded through brushing, the anchor net is used for supporting the roadway firstly, and then end anchoring is conducted through an anchoring agent; (2) erecting of a steel support, specifically, U-shaped steel is machined into two or more round steel supports with the inner diameters being matched with the diameter of the roadway, an anchor rod and the steel supports are fixed through high-strength U-shaped clamping cables, and every two adjacent supports are connected through a pull rod; (3) concrete pouring, specifically, after the supports are mounted, a reinforcing mesh is laid on the inner edges of the supports, used air duct cloth is laid on the reinforcing mesh to serve as a formwork, concrete starts to be poured, and the concrete is compacted through vibration of a vibrating spear; and (4) back-filled grouting, specifically, a grouting anchor rod is arranged on a poured concrete outer wall with a round cross section in a punched mode. According to the supporting method for the underground soft rock roadway of the coal mine, cracks in surrounding rock are filled with cement paste after back-filled grouting is conducted, the surrounding rock is in an intact state again, the stability of the surrounding rock is enhanced, and supporting can be brought into play more effectively.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a method for supporting soft rock roadways in coal mines. Background technique [0002] The strength of the surrounding rock in the soft rock roadway in the coal mine is low, and most of them are expansive. After the roadway is excavated, it is easy to be seriously damaged under the action of the original rock stress and the mining stress. Under the condition of rich water, the surrounding rock is easy to expand and soften when it encounters water. The characteristics of the rock exacerbated its degree of damage, and the surrounding rock showed strong rheological characteristics. The existing soft rock support technologies mainly include anchor net support technology, steel frame shed support technology, masonry support technology, pressure relief support technology, etc. These support technologies are used in the surrounding rock support of some soft rock roadways. It has been w...

AI Technical Summary

Problems solved by technology

The existing soft rock support technologies mainly include anchor net support technology, steel frame shed support technology, masonry support technology, pressure relief support technology, etc. These support technologies are used in the surrounding rock support of some soft rock roadways. It has been widely used in the field, but there are certain defects. The cost of the anchor net support technology and the steel frame shed support technology is too high, and the input-output ratio is unreasonable; the masonry support technology is time-consuming and laborious and cannot meet the needs of rapid construction. ; Pressure relief support technology cannot provide sufficient support strength for large deformation surrounding rock

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