摘要
本文分析了急斜大段高放顶煤矿压显现规律及围岩控制特点,指出增大放高是急斜放顶煤发展趋向;上位顶煤及覆盖层的成拱机制及失稳运动是造成放顶煤面矿压显现和影响顶煤放出的基本因素。放顶煤开采改变了原有的“支架——围岩”关系变成“支架——塑性垫层——围岩”关系。
Having analysed the regularity of ground behaviour in steep coal seam extracted by large sublevel height with caving, the paper points out that the arching mechanism and destabilization of the top coal and overburden above the extracted steep thick seam is the basic factor affecting the fracturing and drawing of the top coal and ground behaviourof working face with caving. The paper stated also the fracturing movement of the strata around a large area gob and expounded the monitoring method of it. As o the relationship between suppots and surrounding rock, the paper considers that the extraction with caving changed the rock relation into support-plastic cushion-surrounding rock relation, because of the formation of a cushion layer consisting of fractured top coal on the supports.
出处
《矿山压力与顶板管理》
1992年第4期43-47,79-81,共5页
Ground Pressure and Strata Control
