论文部分内容阅读
针对传统煤层预裂爆破增透存在的问题,对定向聚能爆破控制裂纹演化方向的理论和方法进行研究,即通过聚能射流的初始导向裂纹与后续高压气体形成的气楔联合作用,达到控制裂纹演化方向和长度的目的。基于模型试验和数值模拟,探讨了定向聚能爆破聚能方向和非聚能方向裂纹演化的机制。在潘三矿掘进工作面现场运用定向聚能爆破技术,达到增加煤体裂纹与保护围岩稳定性有机的统一。试验结果表明:爆破后3 h内抽采瓦斯量变化最为明显,其中最大抽采量是原始抽采量的470倍。有效抽采半径为7 m以内,爆破后顶板振幅约为0.23 cm。
Aiming at the problems existing in traditional pre-cracking blasting, the theory and method of directed polyblend blasting to control the crack propagation direction are studied. By the combination of the initial guiding crack of the converging jet and the gas wedge formed by the subsequent high pressure gas, the control The purpose of crack evolution direction and length. Based on the model test and numerical simulation, the mechanism of crack evolution in directional and non-condensing direction of directional polyblend blasting is discussed. In Pansan digging face of the site using directional energy blasting technology to achieve an increase of coal cracks and the stability of the surrounding rock stability organic unity. The test results show that the change of gas drainage quantity within 3 h after blasting is the most obvious, among which the maximum extraction volume is 470 times of the original extraction volume. The effective extraction radius is less than 7 m, and the roof amplitude after blasting is about 0.23 cm.