煤巷围岩地应力测量及岩芯断裂形态分析

Monitoring of ground pressure of rock surrounding a coal roadway , Suncun Colliery and analysis of breakage features of the related drill core

文章介绍在孙村矿进行的煤巷围岩地应力测量过程，测量获得了三维地应力的大小和方向并且对测量过程中发生的岩芯饼状断裂现象进行了分析。结果表明：测点垂直应力与上覆岩层自重应力基本一致，最大主应力为近水平压应力。岩芯发生饼状断裂是由于垂直于钻孔轴线方向的地应力组合超过岩芯饼状断裂临界应力所致。

Abstract The paper introduces the process of measuring ground pressure of a coalroadway in Suncun Colliery. The measuring achieves the values and directionsof three dimension ground stresses. And the breakage phenomena of drill coreformed with the measuring are analyzed. The research shows that the verticalstress is agreement with the gravitational stress due to the overlayingstrata. The maximum principle stress is near horizontal stress. The breakageof drill core adopts slice style, because the combined stress in thedirection perpendicular to the axis of the drill hole exceeds the strengthof the rock.