软破矿岩条件下无底柱分段崩落法拉槽方案研究及实践

如何安全快速形成切割槽一直是无底柱分段崩落法应用于软破矿岩条件时的一项技术难题。首先分析了传统“先形成切割天井、再形成切割立槽”的拉槽方案在软破矿岩条件下的不适应性，并归纳总结了当前常用的几种无井拉槽方案的优缺点及适用条件。针对金川龙首矿西二采区软破矿岩下无底柱分段崩落法的开采条件，采用了一种“切割平巷+楔形炮排掏槽+直立平行炮排扩槽”的无井快速拉槽方案，同时该方案还可实现在整个分段只进行一次楔形掏槽爆破，便可快速便捷地完成整个分段的拉槽工作，从而大幅度提高了软破矿岩条件下的崩落法拉槽效率和可靠性。最后，在现场对该方案进行了应用，并根据实际应用情况对方案进行了优化，取得了较好的应用成效。

Research and practice of cutting groove scheme for sublevel caving under the condition of soft and broken rock mass

How to form the cutting groove safely and quickly has always been a technical problem when the sublevel caving is applied to the soft broken rock conditions. Firstly, the incompatibility of the traditional cutting groove scheme-"cutting raise first, and then cutting groove" under the condition of soft and broken rock mass is analyzed, and the advantages, disadvantages and the applicable conditions of several commonly used non-raise grooving schemes are summarized. In view of the mining conditions of using the sublevel caving in the condition of soft and broken rock in the West Second Mining Area of Jinchuan Longshou Mine, a non-raise rapid grooving scheme of "cutting tunnel + wedge shaped blast holes grooving + vertical parallel blast holes expansion groove" is adopted. Meanwhile, this scheme can also realize that only one wedge-shaped blasting is performed in the entire sublevel, and the cutting groove work of whole sublevel can be completed quickly and conveniently. Therefore, the efficiency and reliability of the cutting groove during mining by the sublevel caving are greatly improved under the condition of soft and broken rock. Finally, the scheme was applied in the mine, and the scheme was optimized according to the actual application situation, and good application results were achieved.