Study on the rational layout optimization and rock control technology of roadway group in high gas mine

Based on deformation characteristics of different layers and the size of coal pillar, the roadway group in Sihe mine has been optimized and analyzed combined with influence factor of specific geological conditions, excavation connection and surrounding rock control.Six lanes layout plan was proposed by comparison, which reduced the 60 m coal pillar size and one floor roadway engineering quantity, saving 1.63 Mt coal resources.Floor drainage lane with the vertical distance 6 m improved the gas drainage and tunneling efficiency.This paper put forward the scheme of active support of high pre-stressed anchor and cable, and the underground monitoring data showed that the surrounding rock has been maintained good integrity.The experimental results showed that the resource recovery rate was increased and the economic benefit was improved through the optimized layout.