| 基于覆岩结构效应的导水裂隙带发育特征 |
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| 引用本文： | 曹祖宝,王庆涛.基于覆岩结构效应的导水裂隙带发育特征[J].煤田地质与勘探,2020,48(3):145-151. |
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| 作者姓名： | 曹祖宝 王庆涛 |
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| 作者单位： | 煤炭科学研究总院,北京 100013;中煤科工集团西安研究院有限公司,陕西西安 710077;中煤科工集团西安研究院有限公司,陕西西安 710077 |
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| 摘 要： | 为探讨黄陇煤田煤层采动引起的顶板水害问题,以煤层顶板不同覆岩结构采动导水裂隙为研究对象,概化了煤-软-硬-软-硬(组合一)、煤-软-软-硬-硬(组合二)、煤-硬-软-硬-软(组合三)及煤-硬-硬-软-软(组合四)4种典型的岩性组合结构,运用数值模拟和理论计算等方法,分析了不同覆岩组合采动破坏特征和覆岩导水裂隙与覆岩结构之间的相关关系,研究了覆岩结构对导水裂隙发育高度(简称"导高")的影响规律。研究结果显示:在相同的采高条件下,煤-软-硬-软-硬型覆岩结构导高最小,煤-硬-硬-软-软型覆岩结构导高最大;工程实例表明,黄陇煤田煤层开采导高与采高之间并非简单线性关系,利用覆岩结构效应预测的导高更接近实测值。
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| 关 键 词： | 覆岩组合 采动破坏 导水裂隙带 数值模拟 黄陇煤田 |
| 收稿时间： | 2020-01-18 |
Development characteristics of water conducted fracture zone based on overburden structural effect |
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| CAO Zubao,WANG Qingtao.Development characteristics of water conducted fracture zone based on overburden structural effect[J].Coal Geology & Exploration,2020,48(3):145-151. |
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| Authors: | CAO Zubao WANG Qingtao |
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| Institution: | (China Coal Research Institute,Beijing 100013,China;Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China) |
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| Abstract: | In order to study the roof water disaster caused by coal mining in Huanglong coalfield, taking mining failure of layered overburden as research object, four typical composite structural models for coal-soft rock-hard rock-soft rock-hard rock(combination I), coal-soft rock-soft rock-hard rock-hard rock(combination Ⅱ), coal-hard rock-soft rock-hard rock-soft rock(combination Ⅲ) and coal-hard rock-hard rock-soft rock-soft rock(combination IV) were generalized. Numerical simulation and theoretical calculation were used to analyze the mining failure characteristics of different overburden combinations and correlation between water conducting fissures and lithologic combination structure of overburden. The law of the effect of overburden structure on the development height of water conducting fracture was studied. The research results show that under the same mining height, the coal-soft rock-hard rock-soft rock-hard rock overburden structure has the minimum conducting height and the coal- hard rock-hard rock-soft rock-soft rock overburden structure has the maximum conducting height.The engineering examples show that the conducting height of the coal seam mining in Huanglong coalfield is not a simple linear relationship with the mining height, and the guiding height predicted by the overburden structure effect is closer to the measured value. |
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| Keywords: | overburden assemblage mining damage water conducted fracture zone numerical simulation Huanglong coalfield |
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