永久煤柱下巷道围岩稳定性及控制技术分析

Stability and Control Technology of Surrounding Rock under Permanent Coal Pillar

以岱河煤矿Ⅳ_1专用回风巷变形破坏为研究对象,从煤柱支承压力、围岩强度、现有支护措施3个方面分析了其破坏影响因素和机理,通过建立FLAC_(2D)模拟模型明确了巷道与煤柱边缘水平距离、巷道支护方式对围岩应力分布的影响。研究了U型钢、注浆及锚索结构补偿支护3种作用下的巷道弯矩分布、围岩位移等特点,提出了永久煤柱下的巷道在U型钢基础上应进行注浆加固,再用锚索进行针对性支护结构补偿,形成稳定的共同承载体,有效地控制巷道变形。

Broken influence elements and mechanism of special return air entry of Daihe coal mine were analyzed, which included supporting pressure of coal pillar, surrounding rock strength and supporting way. Detailed numerical modeling of FLAC2D was conducted to evaluate surrounding rock stress distribution that influence by horizontal distance of roadway to coal pillar edge and supporting way. These papers studied the characters of roadway moment distribution and surrounding rock displacement that influenced by three different supporting way, which included U style steel supporting, grouting reinforcement and compensate supporting with cable, put forward grouting and compensate supporting with cable should be used on the basis of U style steel supporting in roadway under the per- manent coal pillar, then stability supporting body would formed, and roadway deformation could be controlled effectively.