软弱围岩下某中厚及厚大矿体采矿方法研究

某矿区位于湖区水体下,主要为金铜矿,且矿石品位较高,矿体属于软弱围岩下的中厚及厚大矿体,且顶板围岩稳固性较差。结合矿体具体的赋存条件及现有的开采技术条件,采用数值模拟软件FLAC3D对机械化分段中深孔落矿嗣后阶段充填采矿法、浅孔留矿嗣后充填法、上向水平分层充填法3种采矿方法进行了采场参数研究。通过对6种模拟回采过程中的围岩应力和位移比较,初步确定采场宽度、长度参数分别为14 m、40 m;以初步确定的采场参数为基础,通过最大与最小主应力、顶板与矿柱位移最终确定出3种采矿方法对应的采场宽度均为14 m、长度分别为40、40、42 m;并且随时监测顶板及矿柱的应力、岩移情况,加强顶板管理,及时充填。最后提出下阶段的主要工作是确定合理充填体强度及充填材料。

Research of the Mining Method for a Medium or Thick Ore-body under the Soft Surrounding Rock

A mining area is located under a lake district.It mainly contains gold and copper mine with a higher grade.The ore body in the mining area belongs to the medium and thick ore body under soft surrounding rock with poor stability of roof.Combined with ore-body′s occurrence conditions and the existing mining conditions,the numerical simulation software FLAC^3D was adopted to investigate the stope parameters for three mining methods of medium-length hole sub-level caving with subsequent filling,shallow hole shrinkage stopping with back-filling,and the upward horizontal slicing and filling method.Based on comparison among 6 kinds of simulated mining processes on surrounding rock stress and displacement,the width and the length of stope were initially determined as 14 m and 40 m respectively; Based on the initial stope parameters,maximum and minimum principal stresses,and displacement of roof and pillar,the corresponding stope width parameters for three different mining methods were all determined to be 14 m,and the length was 40 m,40 m and 42 m respectively.Stress of roof and pillar,and rock movement should be monitored at any time to strengthen roof management and make filling in time.Finally,the main task at the next stage was put forward to determine the reasonable filling body strength and the filling material.