中厚倾斜矿体导流结构稳定性研究

Stability Study on Diversion Structure of Inclined Medium-thick Ore body

导流放矿技术有效解决了分段崩落开采中厚倾斜矿体普遍存在的高损失、高贫化问题,但导流结构的稳定性影响着矿山的安全生产。通过应用FLAC^(3D)软件构建中厚倾斜矿体模型,以矿体倾角、导流结构厚度和矿体埋深为主要因素,对不同开采条件下的导流结构最大主应力和塑性区域分布进行了研究。结果表明:影响导流结构稳定性的主要因素为导流结构厚度和矿体埋深;顶板稳定性随导流结构厚度的增加而提高,随矿体埋深增加而降低;导流结构主要在结构隅角处和与围岩的连接处发生"压剪"塑性破坏。

The diversion drawing technology can effectively solve the problem of high loss and high dilution in the sublevel caving mining of inclined medium-thick ore body,but the stability of the diversion structure affects the safety production of the mine.An inclined medium-thick ore body model was built by FLAC3D software.The maximum principal stress and plastic regional distribution of the diversion structure under different mining conditions were studied,taking the dip angle of the ore body,the thickness of the diversion structure and the buried depth of the ore body as the main factors.The results are concluded as follows.Firstly,the main factors affecting the stability of the diversion structure are the thickness of the diversion structure and the buried depth of the ore body.Secondly,the roof stability increases with the increase of the thickness of the diversion structure,and decreases with the increase of the buried depth of the ore body.Thirdly,the compression-shear plastic failure of the diversion structure mainly occurs at the corner of the structure and the connection with the surrounding rock.