Research On Support Technology Of Mining Roadway Of Fully-Mechanized Caving Face Under Small Mine Destroyed Zone In Hanzui Coal Mine

Coal is our country’s main energy, as a non renewable energy, coal reserves are limited, how reasonable exploitation, reduce waste of resources is a problem can not be ignored. However in the existence of damage area of small kiln in many coal mines in our country, on the lower slice mining, roadway extremely unstable, greatly increased the difficulty in supporting. Therefore, the study of a set to conform to the type of roadway supporting technology has important theoretical and practical significance.This paper to Han Ju coal mine 1202 small kiln damage area mining in fully mechanized top coal caving stoping tunnel as the engineering background, using a combination of site investigation, theoretical analysis, numerical simulation and industrial experiment research methods, systematically studied small kiln damage area mining in fully mechanized top coal caving on surface of the roadway supporting technology. Through field research master small kiln damage area mining caving face mining roadway occurrence condition and typical of coal and rock mass mechanical parameters, by numerical to simulate and analyze the rock roadway deformation mechanism, grasp the surrounding rock deformation and failure characteristics, the small kiln destruction of mechanized mining caving face roadway surrounding rock control key technology, are proposed to "partition support", "timely and actively support support, support retaining structure strengthening principle and" three high and one low "and economic rationality of supporting principle, proposed feasibility branch support scheme, by using the FLAC3 D numerical simulation analysis of different support schemes of surrounding rock control effect and to determine the optimal solution(1)when encountered above the goaf roadway without caving: support for steel shed support spacing of 800 mm × 800 mm(2)when the tunnel above the empty area: encountered support for short bolt + I-steel shed:(1)The top coal thickness is 1.4m: bolt length 1.2m, spacing of 800 mm ×800 mm; I-steel shed spacing of 800 mm × 800 mm;(2)The top coal thickness is 1.7m, anchor length 1.5m, spacing of 800 mm × 800 mm; I-steel shed spacing of 800 mm ×800 mm;(3)The top coal thickness is 2.0 m, anchor length 1.8m, spacing of 800 mm ×800 mm; I-steel shed spacing of 800 mm ×800 mm;(3)when the roadway meets the coal pillar, the support method is a long bolt + anchor cable + metal mesh, roof bolt length 2400 mm, 800× 800 mm between the row spacing 1600 mm ×800mm;the cable length 8300 mm, the inter row spacing is 2000 mm ×1600mm.Industrial test results show that the support scheme can effectively control the deformation of surrounding rock of roadway, and significantly improve the speed of roadway drivage, achieved good social and economic benefits, for Korea tip coal mine and other similar conditions of fully-mechanized coal mining of thick coal seam mining face roadway supporting design to provide reference for reference.