蓄水条件下抚顺西露天矿边坡变形失稳与涌浪强烈程度分析
投稿时间:2024-01-11  修订日期:2024-05-16  点此下载全文
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作者单位邮编
吴季寰 中国地质调查局沈阳地质调查中心 110034
李旭光* 中国地质调查局沈阳地质调查中心 
张艳飞 中国地质调查局沈阳地质调查中心辽宁工程技术大学矿业学院 
马天宇 中国地质调查局沈阳地质调查中心 
石绍山 中国地质调查局沈阳地质调查中心 
臧延庆 中国地质调查局沈阳地质调查中心 
邹君 沈阳地铁集团有限公司运营分公司 
中文摘要:潜在矿山地质灾害隐患的准确识别是做好矿区地质环境综合治理的先导。本文在抚顺西露天矿停采后或将面临蓄水成湖修复的背景条件下,采用数值模拟手段,结合地质调查和岩土试验结果分析了蓄水条件下矿区潜在边坡地质灾害的发生部位、变形破坏特征和次生涌浪强烈程度,并通过比较不同填土高度下隐患边坡的稳定性,提出了填-蓄工程优化建议。研究表明,在-150m回填高程和-50m蓄水位工况下,泥页岩软化及顶部断层活化诱发矿坑北帮边坡整体滑移沉陷变形,中下段约133.42×104m3的岩土体局部失稳破坏,形成大型牵引式岩质切层滑坡。滑体入水引发涌浪,最大浪高约11.8m,沿岸最大爬高约15.3m,使北帮局部不稳定边坡、蓄水湖及外延11.6~30.6m范围均处于滑坡-涌浪极高强烈程度区。对比发现,将矿坑填土高度调整为-100m后再蓄水至-50m,可尽量满足矿山修复的地质安全性(F>1.3)和经济可行性要求。研究结果可为矿区后续的地质灾害风险防控和地质环境修复治理提供参考。
中文关键词:抚顺西露天矿  矿坑蓄水  边坡稳定性  变形破坏  涌浪  数值模拟
 
Analysis of Deformation, Instability and Intensity of Secondary Impulse Wave of Slope in Fushun West Open-Pit Mine under Water Storage Condition
Abstract:The accurate identification of potential mining geological hazards is the precursor to the comprehensive treatment of the geological environment in mining areas. Fushun west open-pit mine may face the restoration of water impoundment and lake formation after stoping mining. This study employed geological surveys, geotechnical tests, and numerical simulation. The occurrence location, deformation and failure characteristics and intensity of secondary impulse wave of the potential slope geological disaster under water storage conditions were analyzed. In addition, optimization suggestions for filling and storage engineering were proposed by comparing the stability of key slopes under different backfill conditions. The results indicate that when backfilling to -150m and then storing water to -50m in the mine pit, the softening of mudstone and shale and the activation of the fault induce overall sliding-subsidence deformation of north slope. About 133.42×104m3 rock mass in the lower middle part of the north slope becomes unstable and fail, forming a large-scale traction-type cutting-layer rocky landslide. The sliding mass enters the water and causes impulse wave. The max impulse wave height in the lake is 11.8m, and the max wave climbs as high as 15.3m along the coast. Therefore, the local unstable north slope, the impounding lake, and its extension within 11.6~30.6 meters are in the extremely-high intensity zone of landslide and surge disasters. By comparison, it is found that adjusting the height of the pit fill to -100m and then storing water to -50m can simultaneously meet the requirements of geological safety (F>1.3) and economic feasibility for mine rehabilitation. This study can provide a reference for the prevention and control of geological disaster risks and the restoration and treatment of the geological environment in the mining area.
keywords:Fushun west open-pit  open pit mine impoundment  slope stability  deformation and failure  impulse wave  numerical simulation
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