含硫结块矿石诱导崩落分解特性分析

摘要

To deal with the caking ore in Tongkeng mine,the blasting caving technique was used to induce caving and break caking ore. Taking caking ore as the object,and with LS-DYNA numerical software,tests were designed to simulate the breaking process of caking ore in different dropping heights,angles and strength of weak structure. Broken laws of caking ore were obtained,and the corresponding induced caving parameters were raised. Results showed that①better caving result was got in condition of the caving height 5 m and the caving angle 30°,the broken rate is up to 100%.②height between the caking ore and contact surface should be more than 5 m,and the angle between the ultra-deep blasting surface and horizontal plane need to be 5°<θ<30°. Research results provide theoretical basis for the processes and parameters of broken caking ore induced by caving.%针对铜坑矿矿石结块问题,运用爆破放顶技术,诱导结块矿石的自然崩落分解。以结块矿石为研究对象,利用LSDYNA数值软件对不同跌落角度、跌落高度和弱结构参数条件下的跌落过程进行仿真模拟试验,获得了结块矿石的崩落分解规律,提出了相应的诱导崩落技术参数。研究结果表明：①结块矿石在跌落高度为5m和崩落角度30°时能够获得很好的崩解效果,崩解率达到100%。②结块矿石与触地接触面的高度应不小于5 m,并且诱导爆破超深面与水平形成的夹角θ需满足5°<θ<30°。研究结果为实施诱导破碎结块矿石的技术工艺和参数提供了理论依据。