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孔集煤矿于1975年开始试用光爆锚喷支护新技术,但由于缺乏经验走了不少弯路,几经反复实践,终于掌握了施工要领,逐步扩大推广应用到大断面、斜巷、大峒室和交岔点的支护。尤其是近两年来,全矿光爆锚喷支护巷道达5000余米,占开拓总进尺的70%以上。随着光爆锚喷支护使用范围和数量的不断扩大,致使在施工过程中产生的粉尘浓度高达88.4毫克/米~3;回弹率也在40%左右。这样,不但影响了锚喷支护的技术经济效果,使巷道支护成本大大增加。而且严重危
In 1975, Kongji Coal Mine began pilot trial of the new technology of light burst, shot blasting and shotcrete support. However, due to lack of experience, many detours were passed and after repeated practice, it finally mastered construction essentials and gradually expanded its application to large sections, inclined lanes, Room and intersection support. Especially in the past two years, the mine explosion bolt blasting support tunnel up to 5,000 meters, accounting for more than 70% of the total footage development. With the explosion of blasting shot blasting support range and the number of continuous expansion, resulting in the construction process of dust concentration up to 88.4 mg / m ~ 3; rebound rate is about 40%. In this way, not only affects the technical and economic effects of bolting and shotcrete support, so that the cost of roadway support greatly increased. And serious danger