上盘预留矿柱回采过程中应力场演化规律研究

针对某金矿具有的缓倾斜、破碎、中厚矿体的特点，提出采用分段矿房法回采矿产资源；试验采场围岩总体稳定性较好，但矿体上盘边界是破碎蚀变带，岩石较破碎，而且矿区内地表水体较发育，上盘围岩中有含水层等特点。上盘围岩的冒落，对矿石贫化及安全采矿产生了很大影响，提出了预留上盘矿柱以减缓围岩冒落的方案。采用FLAC3D进行了回采过程中采场应力迁移、位移变化及单元破坏规律的数值计算研究。结果表明：预留2 m的矿柱有利于维持上盘的稳定性，防止塑性区域的扩大，从而达到降低矿石贫化及安全采矿的目的。

Research of Stress Field Evolution in the Exploitation Process of the Reserved Hanging Pillars

For the characteristics of slowly-inclined,broken,medium thickness ore-body,the sublevel room-pillar mining method is put forwards to exploit the mineral resources. In the test stope,the surrounding rock has a better stability,but the hanging wall boundary of the ore body lies in broken alteration zone with broken rocks. The surface water in the mine is devel-oped well,and there is s aquifer layer at hanging wall of the surrounding rock. The caving of the surrounding rock produces a great impact on the ore dilution and the safety mining. The hanging pillars are reserved to slow down the surrounding rock ca-ving. The FLAC3D is used to make numerical analysis on the stope stress migration,displacement and the destruction rule per u-nit. The results showed that the reserved 2 m pillars are beneficial to maintain the stability of the hanging wall,control the ex-tending of plastic zone,so as to lower the ore dilution and achieve the safe mining.