摘要
重复动压作用导致煤巷道围岩受损产生形变,本次研究针对不同采动影响区域制定不同加固方案。分析反复动压下煤巷道围岩变形失稳机制,得知围岩底板与两帮破坏显著,根据工作面巷道两侧支承压力分布将煤巷道群划分成采动无影响区域、影响区域、影响剧烈区域;对不受采动影响区域鳞片状剥落、顶板围岩破碎部分,施加两帮注浆+锚杆加固措施;采动影响区域在两帮注浆+锚杆基础上增加底板加固措施;对于采动影响剧烈区域的断层、褶曲地质构造,应提升煤炭开采工作面推进的速度,采用"卸压-耦合"方式加固高应力区域。由实例监测可知:采动影响剧烈区域和采动影响区域加固效果显著,分区加固方法可确保围岩稳定不受破坏。
Repeated dynamic pressure leads to damage and deformation of surrounding rock of coal roadway.In this paper,different reinforcement schemes were formulated for different mining affected areas.Based on the analysis of the mechanism of surrounding rock deformation and instability under repeated dynamic pressure,it is known that the floor and two sides of surrounding rock were destroyed significantly.According to the distribution of abutment pressure on both sides of working face roadway,the group of coal roadways was divided into mining has no affected area,affected area and severe affected area;areas not affected by mining were scaly spalling and roof encirclement.In the fractured part of rock,two sides grouting+bolt reinforcement measures should be applied;in the mining affected area,the floor reinforcement measures should be added on the basis of two sides grouting+bolt;for the faults and folds geological structure in the mining affected area,the speed of coal mining face advancement should be increased,and the high stress area should be strengthened by"decompression-coupling"method.The monitoring results show that the reinforcement effect is remarkable in areas with severe mining influence and areas affected by mining.The zoning reinforcement method can ensure the stability of surrounding rock.
作者
刘远
LIU Yuan(Shaanxi Huangling No.2 Coal Mine Co.,Ltd.,Yan'an 716000,China)
出处
《粉煤灰综合利用》
CAS
2020年第2期130-135,共6页
Fly Ash Comprehensive Utilization
基金
国家自然科学基金项目(51774229)。
关键词
重复动压
煤巷群
围岩
注浆
卸压-耦合
分区加固
repeated dynamic pressure
coal lane group
the surrounding rock
grouting
decompresition-coupling
partition reinforcement
