A method for retaining entry along the gob with mesh cage filling and support at the entryway

Abstract

The invention discloses a roadway-side supporting method for providing supporting resistance and increasing wall strength by virtue of a single-layer or multilayer mesh cage. Stable supporting resistance of roadway-side supporting can be provided. According to the method, a flexible mesh cage filled with a single layer or multiple layers of gangue is adopted, the lower part is extruded and fastened under the effect of impact force, and the mesh cage has high bearing capacity. The filled gangue with low bearing capacity, large deformation amount and large loosening coefficient is adopted on the upper part, has large shrinkage and can realize early yielding on the top plate, and the gob can be effectively and timely sealed. Moreover, the gangue at the lower part is compacted under the pressure effect and has high strength, so that the whole filling body has large deformation amount and high bearing strength, and dual effects of supporting and sealing are achieved. The method can realize the entry retaining purpose and improve coal yield, is economic and can solve the gangue removal problem.

Description

technical field [0001] The application relates to a method for adopting net cage support for roadside support of underground gob-side entry retention in coal mines. Background technique [0002] Coal mine gobside entry retention (such as figure 1 (shown) means that the transportation lane of the coal mining face is completely preserved and left for the next coal mining face to be used as the return air lane. [0003] Gobside retaining has the advantages of high coal recovery rate and low roadway excavation rate. At present, the commonly used roadside support methods can be divided into two categories: rigid support and flexible support. Rigid support is concrete block wall or filled concrete, dense pillars, etc.; flexible support is wood pile support, gangue belt, etc.; rigid support is usually supported by filling concrete, which has complicated procedures and requires The cost is high; the gangue produced by coal mining in the working face cannot be used, and it will po...

AI Technical Summary

Problems solved by technology

Rigid support is concrete block wall or filled concrete, dense pillars, etc.; flexible support is wood pile support, gangue belt, etc.; rigid support is usually supported by filling concrete, which has complicated procedures and requires The cost is high; the gangue produced by coal mining in the working face cannot be used, and it will pollute the environment when it is transported to the ground; the shrinkage of the rigid support is small, and if the rock burst is large, the wall may crack, and the goaf is poisonous Hazardous gas leakage to the working face poses a hazard

For flexible support, woven bags or snakeskin bags are usually filled with gangue for filling and support. In this method, bagging and stacking of gangue are usually done manually. The degree of mechanization is not high, the amount of manual labor is large, and the efficiency is low; The stability of the gangue wall made of bagged gangue is not high, and it is necessary to use single-layer metal mesh, "W"-shaped steel strips, ladder beams and double-ended threaded anchor rods for pre-tightening reinforcement, otherwise the gangue wall may collapse due to lateral pressure , failed to keep lane

Images