初次来压前综采工作面前方应力影响区范围

Stress Influenced Area in Front of Fully-Mechanized Mining Face Before First Weighting

基于岩梁传递理论和关键层理论,分析了综采工作面前方的应力分布特征,提出工作面上方一定区域的老顶与工作面前方支撑压力区共同构成了翘梁结构.建立了翘梁结构力学分析模型,推导出了初次来压前综采工作面前方支撑压力区范围的量化公式,结合FLAC数值模拟获取计算所需的重要参数,即弹性损伤传递系数.以铁法晓楠矿SW4102工作面为例计算出工作面前方支撑压力区及翘曲应力区范围,并通过现场实测进行验证.

Based on the rock beam transmission theory and the key strata theory,the stress distribution characteristics in front of the fully-mechanized m ining face were analyzed,and a warping beam structure composed by the main roof covering the m ining face and the support pressure area in front of the fully-mechanized m ining face was proposed.A mechanical analysis model of the warping beam structure was bu ilt to deduce the quantitative formula of the supporting area before the first weighting.The FLAC numerical simulation was used to obtain the transfer coefficient of elastic damage.The SW4102 m ining face of Xiaonan coal mine was adopted as a real case to study the ranges of the warped stress zone and the support pressure zone,and results was verified by the in-situ monitoring data.