白音华一号露天矿东帮南北侧大变形治理研究

Research on treatment of large deformation on the north and south sides of east slope in Baiyinhua No. 1 Open-pit Mine

为了解决白音华一号露天矿大变形和底鼓治理问题,以露天煤矿东帮为工程背景,综合采用数值模拟技术和刚体极限平衡法,分析了原设计东帮边坡稳定性,对东帮北侧大变形和南侧底鼓区域进行了优化,并提出了合理的变形治理方案。结果表明:东帮北侧大变形主要受1^(#)煤顶板弱层影响,坡体沿1^(#)煤顶板贯通的剪切面滑出;东帮南侧底鼓的主要原因为二号矿外排土场上部排弃物料持续堆载,边坡下滑力增大,造成下部坡体发生剪胀破坏;东帮北侧大变形区域上部坡体削坡量为63.2万m^(3),下部压帮量为70.9万m^(3),剥离与排土工程量相差较小;东帮南侧排土压脚工作量为318.3万m^(3),治理后变形区边坡稳定性可满足安全储备系数,治理方案可有效缓解东帮大变形对生产带来的影响,保证正常的生产接续。

In order to solve the problem of large deformation and bottom drum control in No.1 Open-pit Coal Mine,taking the east slope of Baiyinhua open-pit mines as the engineering background,the article comprehensively uses numerical simulation technology and rigid body limit equilibrium method to analyze the stability of the east slope of the original design,optimizes the large deformation on the north side and the bottom drum area on the south side,and puts forward a reasonable deformation control plan.Results shows that the large deformation on the north side of east slope is mainly affected by the weak layer of 1^(#)coal roof,and the slope slides out along the shear plane running through 1^(#)coal roof;the main reason for the bottom heave on the south side of the east slope is that the upper part of the waste dump outside the No.2 Mine continues to pile up,and the sliding force on the slope increases,causing shear damage to the lower slope;the upper slope reduction amount in the large deformation area on the north side of the east slope is 632000 m^(3),and the amount of lower pressing is 709000 m^(3).The difference between the amount of stripping and earth removal is small;the workload of the soil discharge presser foot on the south side of east slope is 3180000 m^(3);the stability of the slope in the deformation area after treatment can meet the safety reserve factor;the treatment plan can effectively alleviate the impact of east slope large deformation on production and ensure normal production continuation.