新疆白砾滩露天煤矿烧变岩特征及边坡稳定性分析
Burnt Rock Characteristics and Slope Stability Analysis in Xinjiang Bailitan Open-pit Mine
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摘要: 新疆白砾滩露天煤矿局部位置煤层自燃，围岩受到烘烤、烧灼引起岩性发生变化形成烧变岩。烧变岩整体强度较原岩有所下降，稳定性较差，严重地影响边坡稳定性。通过室内岩石力学试验，得到岩石物理力学参数；同时，结合经验公式方法，通过修正RMR值，得到合理可靠的烧变岩岩体强度参数，以二采区1#典型剖面为对象，采用GEO-Slope软件计算当前边坡的稳定性。在天然水位情况下，GEO-Slope计算边坡最小安全系数为1.073，小于1.1，不满足规范要求。采取疏干排水措施后，1#剖面的最小安全系数为1.203，能满足规范要求。Abstract: Coal spontaneous combustion appears in partial positions of Xinjiang Bailitan Open-pit Mine, which caused the surrounding rock lithology changed and became burnt rock by baking and burning. The overall intensity of burnt rock declined compared to original rock, stability is poorer, which seriously affects the stability of the slope. According to the test results, rock physical and mechanical parameters are given, and then, RMR value is corrected combined with engineering analogy method, the reasonable and reliable parameters for numerical simulation are given. GEO-slope software is used to calculate the current slope stability of 1# typical profile. In the case of natural water level, the minimum slope safety factor is 1.073, less than 1.1, which does not meet the specification. After dewatering and drainage, the minimum slope safety factor is 1.203, which meets the specification.
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Keywords:
- burnt rock /
- strength index /
- slope stability /
- numerical simulation
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