破碎矿体充填采矿法水压支柱护顶技术及其支护特性

Roof support with hydraulic props and support characteristics in backfill mining of fractured ore-body

为了解决深井破碎矿体开采中的支护问题,在两步骤回采充填采矿法中采用水压支柱进行护顶。工业试验表明,第一次加压后水压支柱的初始支撑力为9.4~13.2 MPa,支柱工作阻力在前3d内减小较快,之后缓慢减小;支柱高度均随支护时间的延长而缓慢下降,3d后顶板相对稳定。结果显示,水压支柱技术能有效提高破碎矿体开采过程的采场稳定性。

To solve the supporting problems in mining of fractured deep ore-body, hydraulic props are intro- duced to support the stope roof in two-step backfill mining. The industrial trial results show that the initial support- ing pressures of each prop are 10- 14 MPa after first pressure loading. The supporting resistances decrease dramat- ically before day 3 and decrease gently afterwards. In addition, prop heights decrease gently in the time frame of supporting, and the stope roof tend to be relatively stable after 3 days. The trial demonstrate that the roof support with hydraulic prop can effectively enhance the stope stability within the fractured ore-body during mining.