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基于煤炭开采过程中区段煤柱留设宽度不合理容易造成资源浪费和强矿压显现的现状,采用钻孔应力计和PASAT应力场CT扫描技术对现有煤柱内尺寸合理性进行评估,然后采用理论计算和数值模拟对区段煤柱进行优化。研究结果表明:现有30 m的区段煤柱尺寸偏大大,中间存在6 m的弹性核是导致强矿压的主要原因;经过优化后的煤柱尺寸缩小为8 m,使煤柱处于弹塑性临界状态,同时煤柱内应力水平处于合理的水平值。
Based on the fact that the reserve width of section coal pillar in the coal mining process is irrational, it is easy to cause the waste of resources and the appearance of strong pressure. The borehole stress meter and PASAT stress field CT scanning technology are used to evaluate the size rationality of the existing coal pillar, Then the coal pillar is optimized by theoretical calculation and numerical simulation. The results show that the size of coal pillar in the existing 30 m section is large and the elastic core with 6 m in the middle is the main reason leading to strong pressure. After the optimization, the size of the coal pillar is reduced to 8 m, Plastic critical state, at the same time, the stress level in coal pillar is at a reasonable level.