露天煤矿采矿壁边坡稳定性研究--采用膏体切割回填法

Chano Simao Francisco, Meng Li, Baiyi Li, Makavelo Germain Deon
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引用次数: 0

摘要

根据这项研究的结果,露天煤矿的边坡稳定性问题是可以避免的,采用明挖回填采矿技术可以有效缓解矿壁坍塌。主要研究成果如下(1) 收集并研究了斜坡和废石的岩土力学、物理力学和机械力学特征;研究发现的岩土力学和机械力学特征基本满足边坡稳定性分析的标准。(2)水泥浆回填(CPB)材料由矿山废石和粉煤灰按所需比例制成,与水泥混合作为粘结材料,并在实验室中进行试验,水泥含量的组合比例为 6%、8% 和 10%,粉煤灰含量的组合比例为 25%、30%、35% 和 40%,以确定地下矿山人工地面支撑的理想混合材料,同时考虑经济和性能因素。(3) 利用该模型,研究了水泥比例各种影响因素下 CPB 强度的变化,并利用 FLAC-Slope 8.1 程序对不同水泥浆回填比例进行了极限平衡建模,计算了各水泥比例在固化时间(CT)1 天、3 天、7 天和 28 天后的安全系数,从而获得了边坡上具有高浆填抗剪强度的水泥浆回填土的最佳抗压强度和抗剪直线。(4) 研究成果对露天矿重要设施的安全具有重要意义,为露天矿边坡工程的设计和安全实施提供了依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of Slope Stability of the Mining Wall in an Open-Pit Coal Mine by the Paste Cut-and-Backfill Method
According to this study’s findings, slope stability problems in open-pit coal mines can be avoided, and mine wall collapse can be effectively mitigated by the use of cut-and-backfill mining techniques. The main research results are as follows: (1) The stope and waste rock’s geotechnical, physical, and mechanical characteristics were gathered and examined; the geotechnical and mechanical characteristics found in this study largely satisfy the criteria for slope stability analysis. (2) Cemented paste backfill (CPB) materials were made of mine waste rock and fly ash at a desired ratio, mixed with cement as a bond material, and were tested in the laboratory, using a combination of cement percentages of 6%, 8%, and 10% for the cement content and 25%, 30%, 35%, and 40% for the fly ash content, to determine the ideal mix for artificial ground support in underground mines, taking into account both economic and performance factors. (3) By using this model, the changes in CPB strength were investigated under various factors influencing the cement ratio, and limit equilibrium modeling was used with the FLAC-Slope 8.1 program with different cement paste backfill ratio to calculate the factor of safety for each cement percentage after 1 day, 3 days, 7 days, and 28 days of curing time (CT) to obtain the optimum compressive strength and shear straight of cemented paste backfill with high paste fill shear strength on the slope. (4) The research results are of great significance for the safety of important facilities in open-pit mines and provide a basis for the design and safety implementation of open-pit slope engineering.
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