摘要
针对彬长矿区火石咀煤矿七采区地表堰塞湖下特厚煤层综放安全开采问题,采用现场实测、工程类比等方法研究分析了特厚煤层综放导水裂缝带发育高度,验算了水体下采煤防水煤岩柱尺寸,并类比开采案例分析了堰塞湖下采煤安全性。采用概率积分法计算了堰塞湖地表沉陷变形,预测了湿陷性黄土开采地表裂缝极限发育深度和采动扰动坡体稳定性。研究结果表明:彬长矿区特厚煤层综放导水裂缝带发育异常剧烈,裂采比达到20倍;堰塞湖下煤层顶板基岩厚度远大于所需安全防水煤岩柱尺寸,采取合理的技术措施可以实现地表水下安全开采;地表沉陷不会使堰塞湖淹没面积大幅增加。目前堰塞体稳定性良好,短期不会出现湖水漫坝情况。预测地裂缝最大发育深度达12.8 m,受地形影响堰塞体及湖底地裂缝发育受到抑制,不会导致堰塞湖水体渗漏。采动影响会扰动地表特别是东侧塬体的稳定性,地表沉陷和地裂缝会对临空坡体的崩落滑坡产生促进作用。
The #7 mining area of Huoshizui Coal Mine in Binchang mining area mined the coal seam under the surface barrier lake using the fully mechanized top coal caving method.The field measurement and engineering analogy methods were used to analyze the development height of the water-conducting fracture zone with ultra-thick seam.The size of the waterproof coal pillars was evaluated and the similarity of the mining case was used to analyzes the safety of coal mining under a barrier lake.The surface subsidence was calculated by using the probability integral method,and the limit depth of ground fissure and the stability of mining disturbed slope in collapsible loess was predicted.The results show that the fractured zone of the fully mechanized top coal caving with ultra-thick coal seam is abnormal developed,and the height of the fracture zone is 20 times as high as the coal seam.The thickness of the bedrock of the coal seam is much larger than the required size of the safety waterproof pillar.Mining under water body will be safe by taking safety technical measures.The flood area of the lake won't increase greatly on the impact of surface subsidence.At present,the stability of the dam body is good,and no flooding of the lake will occur in the short term.The maximum depth of ground fissures will reach 12.8 m,and the development of cracks at the bottom of the lake will be suppressed affected by the terrain.Water leakage won't happen.Mining impacts will disturb the stability of the ground surface,especially the east carcass.Ground subsidence and ground fissures will promote the collapse of landslides.
作者
朱伟
滕永海
ZHU Wei;TENG Yonghai(Tangshan Branch,Ecological Enviroment Tehonology Co.,Ltd.,China Coal Technology and Engineering Group Corp.,Tangshan 063012,China)
出处
《采矿与岩层控制工程学报》
北大核心
2021年第1期35-42,共8页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金资助项目(51474129)
唐山市科技发展计划资助项目(19150258E)。
关键词
堰塞湖下采煤
特厚煤层
安全防水煤柱
地表沉陷
地裂缝
mining under barrier lake
ultra-thick seam
safety height of waterproof pillar
mining subsidence
ground fissure
