Anhui Jiangnan Blasting Engineering Co. , Ltd.

针对某大型露天矿山直溜井爆破开挖工况,采用“中心导孔+爆破扩挖”的正向开挖方式进行爆破作业,同时结合光面爆破技术控制溜井成型效果。通过对孔网参数、装药结构、延期方式等进行研究,并结合数值模拟预测结果对孔网参数进行了优化调整。结果表明:最小抵抗线为0.9~1.0m,辅助孔距为0.94~1.07m时,辅助孔之间裂缝基本贯通,可有效保障岩石破碎均匀,提高进尺效果。现场爆破作业采用精细化爆破施工控制措施,针对软弱岩层适当调整进尺和光爆参数,改良光爆装药结构及药量,降低了围岩扰动,保证井筒断面的成型质量。

According to the blasting excavation condition of a vertical chute in a large open-pit mine, the forward excavation method of “central pilot hole+blasting expansion excavation” is used to carry out blasting operation, and smooth blasting technology is adopted to control the forming effect of the pass. By studying blast hole network parameters,charging structure and delay mode, combined with the numerical simulation prediction results, the blast hole network parameters are optimized and adjusted. The results show that the minimum resistance line ranges from 0. 9 to 1. 0 m, the distance between the auxiliary holes is between 0. 94 and 1. 07 m, and the cracks between auxiliary holes are basically completely penetrated, which can effectively ensure the uniform rock crushing and improve the footage efficency. Fine blasting construction control measures are adopted during on-site blasting operation. Aiming at soft rock stratum, the footage and smooth blasting parameters are properly adjusted, the charging structure and dosage of smooth blasting are improved, the disturbance of surrounding rock is reduced, and the forming quality of wellbore section is ensured.

钱明渊,程路,鲁海生,等. 大断面超深溜井爆破扩挖施工设计与仿真分析[J]. 煤矿爆破,2024,42(1):11-14.

QIAN Mingyuan,CHENG Lu,LU Haisheng,et al. Construction design and simulation analysis of blasting expanding excavation of large-section ultra-deep pass[J]. Coal Mine Blasting,2024,42(1):11-14.