以晋宁磷矿6号坑为研究对象,采用相似模拟试验方法,对缓倾斜薄至中厚磷矿体采用露天转地下充填法开采后的采场变形规律、破坏方式和边坡稳定性进行了分析研究,结果表明:在地下开采过程中,采空区上方边坡的稳定性会随着开采的推进而逐渐降低,当开采至边坡坡脚附近时,边坡的位移和应力变化比较剧烈,边坡的稳定性下降也相对较大.因此,在地下开采过程中,加强采空区上方边坡的监测对于边坡的稳定和地下采场的安全具有重要意义.

The basic information and construction situation of comprehensive utilization demonstration base of phosphate rock resources in Yunnan province is described.The advanced technology of demonstration base is introduced,such as the open pit longwall system,the technology of single-reveres and direct-reveres flotation on mid-low grade collophanite ore,the column-cell combined beneficiation technology,etc.,a number of typical experiences and management system that can be demonstrated and applied are proposed.