Supporting method of strip mining with large mining height and roadway filling

Abstract

The invention discloses a supporting method for mining large high roadway type fill strips. The supporting method includes steps of (A), dividing to-be-mined coal seam regions into strip shapes and sequentially arraying mining strips and reserved strips; (B), constructing H-steel sheds; (C), excavating and supporting the strips, and arranging anchor net supports in excavating tunnels; (D), filling rock after the anchor net supports are in place, supplementing equal-strength anchor rods when rib spalling occurs on two sides of each tunnel, and laying longitude and latitude nets. Each anchor net support comprises a group of first support ring layers and a group of second support ring layers, and each group of first support ring layers and the corresponding group of second support ring layers are arranged along the excavating directions at intervals. The supporting method for mining the large high roadway type fill strips has the advantages that the supporting method is simple in process and easy to implement; sinking of roadway roofs and overlying rock strata can be particularly timely and effectively controlled during working face operation for mining the large high roadway type fill strips, accordingly, the supporting method is safe and reliable, normal mining of coal and safe use of earth surface buildings (structures) can be guaranteed, and the supporting method has excellent social and economical benefits.

Description

technical field [0001] The invention relates to the technical field of coal mine mining and support, in particular to a support method for large mining and high lane filling strip mining. Background technique [0002] Mining under buildings, under railways, under water bodies, and above pressurized water is referred to as "three-down-up" mining for short. According to current statistics, the "three-down" coal pressing in my country's coal mines is about 14 billion tons, and the coal pressing under buildings accounts for more than 60% of the entire "three-down" coal pressing. Therefore, taking economic benefit as the first element and adopting some special mining methods to gradually mine the "three-down" coal pressure without affecting the surface buildings (structures) is an important problem that coal enterprises have faced and must solve. question. [0003] Coal mine filling mining is one of the effective methods to liberate the "three downs" of coal pressing, and is an...

AI Technical Summary

Problems solved by technology

However, there is still an impact on the surface when filling and mining techniques are applied

In actual production, in addition to factors such as uncontrollable filling rate and compression of filling materials, another important factor is the support process after tunneling, especially in the working face operation with large mining height (large The mining height refers to the mining operation with the mining height of the working face greater than 3.5m), which cannot timely and effectively control the subsidence of the roof of the roadway and the overlying strata, which intensifies the deformation and damage of the surface and threatens the safety of the surface buildings (structures) use

Images