爆破对围岩松动圈的影响研究

Study on the effect of blasting on the looseningcircle of the surrounding rock

为研究爆破开挖对围岩松动圈的影响,以城郊煤矿相同埋深、相同围岩条件下的五采区轨道下山及下平巷和二水平西翼轨道大巷为工程背景,采用现场测试和理论计算相结合的方法,研究巷道在爆破开挖和掘进机“准静态”开挖方式条件下的围岩松动圈变化规律。结果表明,采用强度理论计算得到松动圈厚度要小于现场实测值,采用爆破开挖的巷道围岩松动圈厚度一般要大于采用掘进机“准静态”开挖的松动圈厚度。

In order to study the effect of blasting on the broken rock zone,with the same depth,the same perimeter rock conditions of the five mining areas of the track under the mountain and the lower level of the lane and the second level of the west wing of the track alley was taken as the background of the project,on-site testing and theoretical calculations combined with the method of research was used in the roadway in the blasting excavation and excavation"static"excavation method under the conditions of the rule of law of the broken rock zone.The results showed that:the strength theory was used to calculate the change rule of perimeter rock loosening circle.The results showed that:the size of the loosening circle calculated by strength theory was smaller than the measured value on site,and the thickness of the loosening circle of the peripheral rock of the roadway excavated by blasting was generally larger than that of the loosening circle of the roadway excavated by the roadheader"quasi-static"excavation.