金川三矿区东部贫矿现场地应力测量及应力分析

金川三矿区东部贫矿地处于F₁₇断层以东,属于超基性贫矿。随着选矿和冶炼技术的逐步提高,三矿区东部贫矿于2004年4月份建成投产,是金川三矿区的主力采区。掌握矿山围岩应力状态,可以为采矿方法的选择、巷道的支护与施工、防止巷道大变形提供有效的科学依据。采用空心包体应力解除法对三矿区东部贫矿1200m-1450m进行地应力实测,共获得13个测点的地应力实测数据,1200m水平获得7个地应力测点,1250m-1450m水平获得6个地应力测点。通过分析地应力实测数据表明,井下1200m～1450m水平最大主应力量值为13.0～21.1MPa,属于中等应力水平。部分测点的最大水平主应力倾角超过20°,最大达到-57°表明该地区应力状态较为复杂,应力作用方式发生改变,水平应力为主导的趋势已不明显。

In situ stress measurement and stress analysis of the Eastlean mine in the third mining area of Jinchuan

The east of Jinchuan No.3 mining area is located to the east of F17 fault, which belongs to ultrabasic poor ore. With the gradual improvement of beneficiation and smelting technology, the East lean ore in the third mining area was completed and put into operation in April 2004, which is the main mining area in the third mining area of Jinchuan. Mastering the stress state of the surrounding rock of the mine can provide an effective scientific basis for the selection of mining methods, the support and construction of the roadway and the prevention of large deformation of the roadway. The method of hollow inclusion stress relief is used to measure the in-situ stress of 1200m-1450m poor mine in the east of the third mining area. The in-situ stress data of 13 measuring points are obtained, 7 measuring points are obtained at 1200m level, and 6 measuring points are obtained at 1250m-1450m level. Based on the data, the stress state and action characteristics of the poor ore in the east of the third mining area are analyzed. The measurement results show that the maximum principal stress value of 1200m-1450m underground is 13.0-21.1mpa, which belongs to the medium stress level. The dip angle of the maximum horizontal principal stress of some measuring points exceeds 20 ° and reaches - 57 ° at most, indicating that the stress state in this area is relatively complex. The characteristics of the stress field in the mining area dominated by the horizontal stress have changed, and the trend of the horizontal stress as the dominant one is not obvious.