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首页> 外文期刊>Advances in civil engineering >The Influences of Key Strata Compound Breakage on the Overlying Strata Movement and Strata Pressure Behavior in Fully Mechanized Caving Mining of Shallow and Extremely Thick Seams: A Case Study
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The Influences of Key Strata Compound Breakage on the Overlying Strata Movement and Strata Pressure Behavior in Fully Mechanized Caving Mining of Shallow and Extremely Thick Seams: A Case Study

机译：关键地层复合破裂对浅层厚度综合煤矿覆盖层运动和地层压力行为的影响 - 案例研究

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摘要

In order to analyze the impact of compound breakage of key strata on overlying strata movement and strata pressure behavior during the fully mechanized caving mining in shallow and extremely thick seams, this paper took the 1322 fully mechanized caving face in Jindi Coal Mine in Xing County as the engineering background. Under the special mining and geological condition mentioned above, UDEC numerical simulation software was applied to research the engineering problems, and results of numerical simulation were verified through the in-site measurement. The research results showed that during the fully mechanized caving mining in shallow and extremely thick seams, the inferior key strata affected by mining movement behaved in the mode of sliding instability and could not form the stable structure of the voussoir beam after breaking and caving. In addition, the main key strata behaved in the mode of rotary instability, and the caving rocks behind the goaf were gradually compacted because of the periodic instability of the main key strata. With the continuous advance of the working face, the abutment pressure of the working face was affected by the compound breakage and periodic instability of both the inferior key strata and the main key strata, and the peaks of the abutment pressure presented small-big-small-big periodical change characteristics. Meanwhile, the risk of rib spalling ahead of the working face presented different levels of acute or slowing trends. The actual measurement results of ground pressure in the working face showed that, in the working process, the first weighting interval of the inferior key strata was about 51m and its average periodic weighting interval was about 12.6m, both of which were basically consistent with the results of numerical simulation. The research has great significance in providing theoretical guidance and practical experience for predicting and controlling the ground pressure under the similar mining and geological conditions.
机译：为了分析复方破损的影响关键地层对浅层和极厚接缝综合机械化开采期间覆盖层运动和地层压力行为的影响，本文采用了邢县金迪煤矿的1322齐全机械化洞面工程背景。在上述特殊采矿和地质条件下，应用UDEC数值模拟软件对研究工程问题，通过现场测量验证了数值模拟的结果。研究结果表明，在浅层和极厚接缝的综合机械化矿区，受挖掘运动影响的下键地层在滑动不稳定性的模式下表现出来，并且在断开和塌陷后不能形成Voussoir梁的稳定结构。此外，主要关键地层表现在旋转不稳定性的模式下，并且由于主要关键地层的周期性不稳定性，GOF后面的洞穴岩石逐渐压实。随着工作面的连续前进，工作面的邻接压力受到劣质段和主要关键地层的复合破裂和周期性不稳定性的影响，以及邻接压力的峰值呈现出小小的小-big周期性变化特征。同时，在工作面前肋骨剥落的风险呈现出不同级别的急性或速度趋势。工作面内部压力的实际测量结果表明，在工作过程中，下键地层的第一加权间隔约为51米，其平均周期性加权间隔约为12.6m，这两者都与之一致数值模拟结果。该研究具有重要意义，提供了在类似采矿和地质条件下预测和控制地面压力的理论指导和实践经验。

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  • 来源
    《Advances in civil engineering》 |2019年第2期|5929635.1-5929635.11|共11页
  • 作者

    Li Junmeng; Huang Yanli; Zhang Jixiong; Li Meng; Qiao Ming; Wang Fengwan;

  • 作者单位

    China Univ Min & Technol Sch Mines State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China|Univ Queensland Sch Mech & Min Engn Brisbane Qld 4072 Australia;

    China Univ Min & Technol Sch Mines State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mines State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mines State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mines State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mines State Key Lab Coal Resources & Safe Min Xuzhou 221116 Jiangsu Peoples R China;

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