软岩边坡露天煤矿弱层深度敏感度研究
Research on depth sensitivity of weak layers in open-pit coal mine with soft rock slope
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摘要: 为了研究弱层存在深度与软岩边坡稳定性的关系,以内蒙古某软岩边坡露天煤矿为例,依据工程地质勘察成果及初步设计,确定岩土体物理力学指标,并建立典型工程地质模型;根据典型工程地质模型,运用极限平衡理论进行弱层深度与软岩边坡稳定性关系的分析研究。结果表明:如若该矿10煤底板下存在有泥岩弱层,当该弱层位于底板泥岩以下20 m处,对边坡稳定性影响最大。依据研究成果提出了弱层勘察方案及地下岩移监测方案。
Abstract: In order to study the relationship between the depth of the weak layer and the stability of the soft rock slope, take a soft rock slope open-pit coal mine in Inner Mongolia as an example, based on engineering geological survey results and preliminary design, we determine the physical and mechanical indexes of rock and soil and establish a typical engineering geological model. According to typical engineering geological models, limit equilibrium theory is used to analyze the relationship between the depth of weak layers and the stability of soft rock slopes. The results show that if there is a weak layer of mudstone under the 10th coal floor of the mine, when the weak layer is located 20 m below the floor mudstone, it will have the greatest impact on the stability of the slope. Based on the research results, a weak layer survey plan and underground rock movement monitoring program are proposed.
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