妨碍高效率的底部放矿采矿法在矿床开采中有效发展的原因之一是传统的锥形巷道(漏斗)、堑沟与运矿巷道连接处不够稳固。这种连接处(眉线部分)尖锐,致使这个地方应力集中,降低了它的稳固性。此外,锥形放矿巷道中,矿石块运动轨迹在放矿口中心交会,结果甚至几块合格块度的矿 One of the reasons that impede the efficient bottom-draw mining method of effective exploitation in the mining is that the traditional conical tunnel (funnel) is not stable enough for the connection between the trench and the mine roadway. This connection (eyebrow line part) sharp, resulting in stress concentration in this place, reducing its stability. In addition, the conical mine laneway, ore block trajectory in the ore mouth center intersection, the result of even a few pieces of qualified block mine