宝日希勒露天矿南帮边坡稳定分析与治理方案
South End Slope Stability Analysis and Control Program of Baorixile Surface Mine
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摘要: 为避免神华宝日希勒露天矿南帮边坡变形加剧而最终引发滑坡灾害,基于现场地质勘查的结论和岩土体物理力学试验,分析了南帮边坡变形破坏的机理和边坡破坏模式,并对现状稳定性和长期稳定性进行了分析;综合考虑矿山开采现状及未来规划,通过对比治理措施,最终确定采取坡底压脚的方案来进行边坡治理,并对边坡治理效果进行了分析。结论表明:南帮+610 m平盘压脚长度取115 m,单台阶段高25 m,+625 m平盘压脚长度取137 m,单台阶段高为20 m时,整体边坡的稳定系数可达1.204,满足边坡稳定需要,并通过数值计算、极限平衡计算验证了治理方案的合理性;同时,确定了潜在滑坡区域坡脚煤层采用窄条带分层快采、内排及时跟进方法,确保了煤炭资源的安全、高效回收。Abstract: To avoid intense deformation and serious failure of south end slope in Baorixile Surface Mine to cause landslide disaster, this paper analyzes its deformation mechanism and failure mode, and deduces its present situation and long-term stability, based on in-situ geological survey and rock and soil's physical-mechanical parameters. And taking the current state and future planning of mine exploiting into account, the pressing slope foot method is suggested as an effective measurement, which effect is also analyzed in this paper. Results show that the slope stability coefficient can reach 1.204 if the following measurement project is carried out: 115 m length of the pressing foot with 25 m height of single step at +610 m flat plate and 137 m length of the pressing foot with 20 m height of single step at +625 m flat plate. The rationality of above measurement is described and verified by numerical calculation. Besides, narrow strip hierarchical fast mining and internal dumping at potential landslide area can ensure the safe and efficient recovery of coal resources.
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Keywords:
- failure mechanism /
- slope deformation /
- control program /
- strip mining /
- surface mine /
- slope stability /
- landside
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