基于爆破损伤的强制放顶爆破参数设计与应用

通过总结综采工作面坚硬顶板深孔爆破强制放顶成功案例，得出以爆破裂隙区半径为强制放顶爆破参数设计的不合理性，提出以爆破损伤范围为依据进行爆破参数计算。研究以国投新集二矿210108工作面为依托，通过爆破振动监测，回归得到综采面深孔爆破振动速度传播衰减规律，由此导出炮孔周围岩体内的质点振动峰值速度衰减规律。计算结果表明，炮孔直径75mm、装药直径63mm的深孔爆破可以在周围岩体中形成半径为7.631m重度损伤区，解释了炮孔间距大于10m仍能有着良好爆破效果的原因；设计最大孔底间距15.2m的爆破参数，并成功进行了现场应用，验证了计算方法的可靠性，为类似工程爆破参数设计提供了一个新方法。

Design and application of blasting parameters in forced caving based on blasting damage

By analyzing the successful cases of forced caving with deep hole blasting on hard roof in fully mechanized working face, the irrationality of taking the radius of blasting fracture zone as the blasting parameters design in forced caving was presented, and it was put forward to conduct blasting parameters calculation with the blasting damage range as criterion. Based on the 210108 working face of the second Xinji coal mine, the attenuation law of vibration velocity transmission under deep hole blasting in fully mechanized working face was obtained by regres-sion analysis on the blasting vibration monitoring data, and the attenuation law of peak velocity of particle vibration in the surrounding rock mass of blasting hole was derived. The results showed that the severely damaged area with 7.631 m radius was formed in the surrounding rock mass by the deep hole blasting with 75 mm blasting hole di-ameter and 63 mm charge diameter, the reason that the good blasting effect can be achieved when the distance of blasting hole is larger than 10m was explained. The blasting parameter taking 15.2 m as the maximum distance of hole bottom was designed, and the field application was successfully conducted, which verified the reliability of the calculation method. It provides a new method for blasting parameters design in similar engineering.