液态CO_2致裂技术在冲击地压防治中的应用

Application of liquid CO_2 fracturing technique in rock burst control

为解决冲击地压常规解危措施中的难题,研发了冲击地压防治新技术,即液态CO_2致裂。系统介绍了液态CO_2致裂技术的工作原理,在实验室中通过自主研发设备进行压力转化率测试,测试了不同孔壁和泄能头间距与爆破压力的关系,根据实验室研究成果在现场进行了工业性试验。研究实践表明,液态CO_2致裂无明火、可反复使用,是一种新型安全高效的防冲手段。孔壁和泄能头间距越小,孔壁所受压力越大;间距为10~21 mm时,压力转化率为70%~82%;封孔较不封孔压力增大了52.3%。选用直径为50、65 mm两种规格的钻孔进行现场煤体致裂,通过钻孔窥视和光纤监测发现致裂效果良好,研究成果可在高瓦斯冲击地压矿井进行应用。

In order to solve the problem of rock burst in conventional controlling measures, this paper studied the impact of new technology, pressure treatment liquid CO2 fracturing system.This paper introduced the working principle of liquid CO2 fracturing technology, test the conversion rate of pressure by independent development equipment in the laboratory, and test the relationship between the blasting pressure and the different spacing of hole wall and discharge head.According to the results, industrial experiment is carried out in the field.The re- suits indicates that liquid CO2 fracturing can be no fire and used repeatedly, it is a new type of safe and efficient controlling measure.The smaller the spacing between hole wall and discharge head,the more pressure on the hole wall.When the spacing is from 10 mm to 21 mm, the conversion rate of pressure is 70% - 82%.The pressure of sealing increased by 52.3% compared with no sealing.Selected two types of drilling hole （~50 mm, ~65 ram） to split the coal seam in the field,it has good pressure relief effect monitored by peeping drilling hole and optical fiber sensor, the research results can be applied in high gas and rock burst mines.