露天转地下挂帮矿开采边坡稳定性及失稳模式研究
发布时间：2018-08-09 08:03
【摘要】：为研究露天转地下挂帮矿的开采工作面倾角的布置方式对工作面上覆岩体应力与边坡失稳破坏模式的影响,以海南矿业公司露天边坡挂帮矿井采为例,采用理论计算和数值模拟相结合的方法对其进行了分析。结果表明:露天边坡下开采时工作面倾角的布置对边坡稳定性影响显著;工作面倾角由30°到-30°逐渐减小的过程中,工作面上覆岩体及露天边坡台阶变形量越大,边坡内上覆岩体内剪切应力集中程度和最大主应力集中程度越来越高,边坡失稳破坏的趋势增强;边坡围岩上部压力拱成拱机制较弱,开采工作面右端位移临界区域岩体的抗剪强度对边坡整体稳定性起到关键作用;露天边坡下开采边坡岩体不同区域可能发生的失稳破坏模式主要为张拉破坏—垮落破坏—剪切滑移破坏—剪切错动破坏—挤压鼓胀破坏。
[Abstract]:In order to study the influence of the arrangement of inclined angle on the stress of overlying rock mass and the failure mode of slope instability in the mining face of open pit to underground hanging slope, a case study was made in Hainan Mining Company. The method of theoretical calculation and numerical simulation is used to analyze it. The results show that the inclined angle of the working face has a significant effect on the stability of the slope when mining under the open-pit slope, and the larger the deformation of the overlying rock mass and the step of the open-pit slope is in the process of gradually decreasing the slope angle from 30 掳to -30 掳. The shear stress concentration degree and the maximum principal stress concentration degree in the overburden rock of the slope are higher and higher, the tendency of the slope instability and failure is enhanced, and the arch mechanism of the pressure arch in the upper wall rock of the slope is relatively weak. The shear strength of the rock mass in the critical region of the displacement at the right end of the mining face plays a key role in the overall stability of the slope. The possible failure modes of rock mass in different regions of mining slope under open-pit slope are tensile failure, collapse failure, shear slip failure, shear dislocation failure and extrusion bulging failure.
【作者单位】： 北京科技大学土木与资源工程学院;煤炭科学研究总院建井研究分院;鄂尔多斯市营盘壕煤炭有限公司;海南矿业股份有限公司;
【基金】：国家自然科学基金重点项目(编号:51534002) 国家重点研发计划项目(编号:2016YFC0600801)
【分类号】：TD854.6
本文编号：2173444
[Abstract]:In order to study the influence of the arrangement of inclined angle on the stress of overlying rock mass and the failure mode of slope instability in the mining face of open pit to underground hanging slope, a case study was made in Hainan Mining Company. The method of theoretical calculation and numerical simulation is used to analyze it. The results show that the inclined angle of the working face has a significant effect on the stability of the slope when mining under the open-pit slope, and the larger the deformation of the overlying rock mass and the step of the open-pit slope is in the process of gradually decreasing the slope angle from 30 掳to -30 掳. The shear stress concentration degree and the maximum principal stress concentration degree in the overburden rock of the slope are higher and higher, the tendency of the slope instability and failure is enhanced, and the arch mechanism of the pressure arch in the upper wall rock of the slope is relatively weak. The shear strength of the rock mass in the critical region of the displacement at the right end of the mining face plays a key role in the overall stability of the slope. The possible failure modes of rock mass in different regions of mining slope under open-pit slope are tensile failure, collapse failure, shear slip failure, shear dislocation failure and extrusion bulging failure.
【作者单位】： 北京科技大学土木与资源工程学院;煤炭科学研究总院建井研究分院;鄂尔多斯市营盘壕煤炭有限公司;海南矿业股份有限公司;
【基金】：国家自然科学基金重点项目(编号:51534002) 国家重点研发计划项目(编号:2016YFC0600801)
【分类号】：TD854.6
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