摘要
选用铜弦钻孔应力计对煤柱受采动过程中的应力变化进行观测。分析表明，在工作面推进过程中，靠近工作面侧46m范围内煤柱受到支承压力影响，并且呈凸台形式；52-60m范围内基本不受采动影响，并且靠近工作面46m范围内煤柱中存在一小一大两个支承压力峰值，分别位于工作面侧18m和38m处。由煤柱的边缘到深部，煤柱塑性区为0-10m，弹性区为10-50m，原岩应力区为50-60m。
String wire borehole stress meter was applied to monitor the mining - induced stress variation of coal pillars. Analysis shows that, in the advance of working face, the coal pillars were influenced by the abutment pressure in the range of 46m from working face, showing boss form. Coal pillars in the range of 52 ~ 60m were not affected by mining, and a smaller and a bigger peaks of abutment pressure range of coal pillars existed in the range of 46m from working face, which located at 18m and 38m respectively from the working face. From the edge of coal pillar to the inner part, the plastic zone was 0 - lOre. the elastic zone was 10 - 50m. and the initial stress zone was 50 ~ 60m.
出处
《煤炭工程》
北大核心
2014年第4期74-75,79,共3页
Coal Engineering
关键词
大采高
煤柱分区
侧向支承压力
钢弦钻孔应力计
large mining height
coal column partition
side abutment pressure
string wire borehole stress meter
