煤矿巷道围岩强度分布特征研究

Study on Strength Distribution Characteristics of the Surrounding Rock in the Coal Mine Roadway

为了更好掌握巷道煤岩体强度特征,了解其在空间、时间上的变化规律,通过钻孔剪切法对巷道围岩、煤体强度进行了原位测试。研究结果表明:当测试深度不断变大时,整体上黏聚力呈现出逐渐提升的趋势;测孔在帮部时,深度逐渐增大下,单轴压缩强度与黏聚力也随之慢慢增大;对比新掘巷道,开挖4个月的巷道围岩黏聚力有显著的降低。

In order to better grasp the strength characteristics of the coal and rock masses in the roadway and understand their changes in space and time,in-situ testing is conducted on the strength of the surrounding rock and coal masses in the roadway using the drilling shear method.The research results indicate that as the testing depth continues to increase,the overall cohesion shows a gradually increasing trend;When the measuring hole is on the edge,as the depth gradually increases,the uniaxial compressive strength and cohesion also gradually increase;Compared to newly excavated roadways,the cohesion of the surrounding rock of the roadway after 4 months of excavation has significantly decreased.