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为揭示地鼓产生的原因及其对边坡变形破坏机理与稳定性的影响,结合白音华一号露天煤矿东帮工程实例,在分析边坡工程地质特征的基础上,应用极限平衡理论并通过反分析法确定了2~#煤顶板弱层抗剪强度,评价了地鼓区边坡稳定;应用FLAC3D数值模拟软件对优化后的边坡进行了数值模拟研究。结果表明:2~#煤顶板弱层及地鼓是控制边坡稳定的决定性因素;地鼓区滑坡模式为剪切圆弧-弱层-地鼓裂缝相结合的组合滑动;选定安全储备系数为1.1,5~6剖面现状边坡满足安全储备要求;1~4剖面现状边坡不满足安全储备要求;1~4剖面原设计边坡均不满足安全储备要求;经削坡优化治理不稳定边坡,优化后1剖面整体边坡角为22°,2~4剖面为24°。该研究可为白音华一号露天矿东帮边坡治理提供指导,为类似条件下露天矿安全生产提供借鉴。
In order to reveal the reason of drumming and its influence on the deformation and failure mechanism and stability of slope, combined with the example of Dongba project of Baiyinhua No.1 open-pit coal mine, based on the analysis of engineering geological features of slope and using limit equilibrium theory The shear strength of the weak layer of coal roof 2 ~ # was determined by back analysis method, and the slope stability of the ground drum area was evaluated. The numerical simulation of the optimized slope was carried out by FLAC3D numerical simulation software. The results show that the weak layer and the ground drum are the decisive factors to control the slope stability. The landslide pattern in the drum area is the combined slip of shear arc-weak layer-ground drum crack. The selected safety reserve coefficient The slope is 1, 5 ~ 6, the slope meets the requirement of safety reserve; the current situation of 1 ~ 4 profile does not satisfy the requirement of safety reserve; the original designed slope of 1 ~ 4 profile does not meet the requirement of safety reserve; For the slope, the overall slope angle of the optimized section 1 is 22 ° and the section 2 ~ 4 is 24 °. The study can provide guidance for the management of Baiyinhua No. 1 open pit eastern slope and provide reference for the safe production of the open pit under similar conditions.