金川二矿深部1 000 m中段地应力测量 及应力状态研究

 金川镍矿是我国最大的硫化铜镍矿，而二矿又是金川镍矿的主力矿山。目前二矿已进入深部开采阶段，由于矿岩破碎、剧烈开采扰动以及巷道采场结构越来越复杂，加之应力状态的改变，围岩稳定性问题更加突出。为此在二矿深部1 000 m中段进行了系统的地应力测量，以了解深部应力分布特征及其变化规律。现场测试采用空心包体应力解除法，共获得7个测点的三维应力数据。地应力测量成果表明，在井下700～800 m深度范围内，最大主应力量值基本为20～30 MPa，大部分测点最大主应力方位为NNE～NE向，最大主应力倾角在40°以上，以水平应力为主导的应力作用特征发生改变。

STUDY ON RECENT STATE OF STRESS IN DEPTH 1 000 M OF JINCHUAN MINE

The Jinchuan mine is a large copper and nickel deposit，and the mine district No.2 is one of the key deposits of the Jinchuan nickel mine. At present，this district goes into the deep mining. The drifts are strongly deformed and severely damaged by deep mining. In order to study stress state in deep mining，geostress survey is carried out in mine district No.2. In-situ stress measurement is carried out by hollow inclusion gauge method，and three-dimensional stresses at seven measuring points are obtained. The measurement results show that at the depth 700 to 800 m from underground，the maximum principal stress is about 20 to 30 MPa. For most of the measuring points，the maximum principal stresses are in the direction of NNE-NE，and the dip angle of them is above 40°；and the stress state governed by the horizontal stress changed obviously.