碱性溶液降低煤体冲击倾向性的实验研究

利用RMT-150B岩石力学实验系统对千秋矿原始煤样、清水浸泡煤样与碱溶液浸泡煤样开展实验研究，分析煤样弹性能量指数、冲击能量指数、动态破坏时间和单轴抗压强度指标的变化趋势。综合判断表明，原始煤样和清水浸泡煤样分别为强冲击性和弱冲击性，而碱溶液浸泡后其力学强度急剧下降，由脆性向塑性变化趋势最明显，变为完全无冲击性。通过煤样的工业应用指标、接触角、浸泡时间/力学强度、碱溶液的浓度和用量等测试，初步分析了碱溶液在煤矿的应用前景，对中低阶煤层来说，在煤层注水时加入少许碱性药品实现物理-化学联合作用防治冲击地压，同时还兼具降尘效应。

Experimental study on reducing outburst proneness of coal seam via alkaline solution

Raw coal samples selected from Qianqiu Mine and those of treated coal samples soaked respectively in clean water and alkaline solution were investigated using RMT-150B rock test system.In the test，the elastic energy index，impact energy index，dynamic destruction time and uniaxial compression strength were analyzed on their variation tendencies.According to a series of comprehensive analysis，raw coal samples and water-soaked ones were determined as strong impact-performance and weak impact-performance respectively，while the alkaline-soaked ones had no impact-performance due to a drastic decrease of mechanical strength along with an evident trend of turning plasticity from brittleness.Based on the tests of proximate analysis，contact angle and soaking time to mechanical strength ratio，the concentration and dosage of alkaline solution etc，the prospect of alkaline solutions applied to collieries was considered in that the physical-chemical coupling effect of water infusion added with a small amount of alkaline solutions into mid-low rank coal seams will effectively prevent rock burst and dust generation.