岩土力学 ›› 2023, Vol. 44 ›› Issue (10): 3011-3021.doi: 10.16285/j.rsm.2022.1042

• 岩土工程研究 • 上一篇    下一篇

浅埋厚松散层薄基岩综采工作面开采覆岩切落体结构分析及应用

汪北方1, 2，蒋嘉祺1，刘学生2，梁冰3，张晶4   

  1. 1. 辽宁工程技术大学 矿业学院，辽宁 阜新 123000；2. 山东科技大学 山东省矿山灾害预防控制重点实验室，山东 青岛 266590； 3. 辽宁工程技术大学 力学与工程学院，辽宁 阜新 123000；4. 辽宁工程技术大学 理学院，辽宁 阜新 123000
  • 收稿日期:2022-07-05 接受日期:2022-10-27 出版日期:2023-10-13 发布日期:2023-10-16
  • 通讯作者: 刘学生，男，1988年生，博士，教授，主要从事矿山压力与岩层控制方面的研究。E-mail: xuesheng1134@163.com E-mail:wang_beifang@126.com
  • 作者简介:汪北方，男，1988年生，博士，副教授，主要从事矿山岩体力学与岩层控制方面的研究。
  • 基金资助:
    国家自然科学基金（No.52374092）；辽宁省自然科学基金（No.2021-MS-339）；辽宁省教育厅科学技术研究项目（No.LJKZ0334）；山东科技大学山东省矿山灾害预防控制重点实验室开放课题基金（No.SMDPC202303）；辽宁工程技术大学学科创新团队资助项目（No.LNTU20TD-05，No.LNTU20TD-17）。

Analysis and application of sheared and fallen roof structure during shallowly buried fully mechanized mining under thick loose bed and thin base rock

WANG Bei-fang1, 2, JIANG Jia-qi1, LIU Xue-sheng2, LIANG Bing3, ZHANG Jing4   

  1. 1. School of Mines, Liaoning Technical University, Fuxin, Liaoning 123000, China; 2. Shandong Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, Shandong 266590, China; 3. School of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China; 4. School of Science, Liaoning Technical University, Fuxin, Liaoning 123000, China
  • Received:2022-07-05 Accepted:2022-10-27 Online:2023-10-13 Published:2023-10-16
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52374092), the Liaoning Provincial Natural Science Foundation of China (2021-MS-339), the Scientific Research Fund of Liaoning Provincial Education Department (LJKZ0334), the Open Fund of Shandong Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology (SMDPC202303) and the Fund of Discipline Innovation Team of Liaoning Technical University (LNTU20TD-05, LNTU20TD-17).

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摘要： 浅埋厚松散层薄基岩综采工作面开采覆岩破断失稳诱发的强压显现问题日益凸显，已对矿井安全及高效生产带来严重威胁。为此，以神东矿区22614工作面为工程背景，采用现场监测、相似试验与力学建模相结合的研究方法，分析其强矿压显现特征，揭示采动覆岩破断失稳诱因，构建覆岩破断结构力学模型，核定工作面液压支架工作阻力，并开展现场实例应用。结果表明：现场监测的工作面开采顶板平均破断步距为11.2 m，液压支架平均工作阻力为8 450.1 kN，最大工作阻力为11 857 kN；相似试验中，工作面开采老顶呈短悬臂岩梁剪切破断，断裂面贯通地表，覆岩滞后煤壁整体切落，平均垮落步距为12.5 m；通过建立浅埋厚松散层薄基岩综采工作面覆岩切落体结构平面力学模型，提出了覆岩切落体结构失稳判据，指明不稳定系数与覆岩切落角和液压支架承载力间的正相关关系；并给定了工作面液压支架工作阻力计算公式，算出了液压支架平均承载力为8 364.22 kN，与现场监测结果具有较好的一致性。该结果可为我国浅埋厚松散层薄基岩综采工作面支架选型和顶板控制提供重要的理论依据。

关键词: 浅埋综采工作面, 厚松散层薄基岩, 切落体结构, 平面力学模型, 失稳判据, 液压支架工作阻力

Abstract: Severe ground pressure problem during shallowly buried fully mechanized mining under thick loose bed and thin base rock is increasingly prominent, which has seriously threatened safety and efficient production in coal mine. This study took 22614 working face in Shendong mining field as engineering background, adopted the combination research method of field monitoring, similar experiment and mechanical modeling to analyze the characteristics of its strong ground pressure, to reveal cause of mining-induced roof broken and instability, to build mechanical model of roof broken structure, to determine working resistance of hydraulic support in working face, and finally to perform field example application. The study results showed that: based on field monitoring, the average roof broken length of 22614 working face was 11.2 m; the average working resistance of hydraulic support was 8 450.1 kN, and the maximum working resistance was 11 857 kN. In similar materials simulation experiment, the average caving length was 12.5 m, and roof sheared and broke as short suspension beams, crack extended to surface, which led to the whole sheared roof falling behind coal wall. As well plane mechanical model of sheared and fallen roof structure was established, then the structure instability criterion was put forward, the positive correlation between instability coefficient and roof sheared and fallen angle, bearing capacity of hydraulic support was pointed out. Certainly, working resistance calculation formula of hydraulic support in working face was given and calculated average bearing capacity of hydraulic support was 8 364.22 kN, which is in good agreement with the field monitoring results. The results provided important theoretical basis for support selection and roof control of shallowly buried fully mechanized mining under thick loose bed and thin base rock in China.

Key words: shallowly buried fully mechanized mining face, thick loose bed and thin base rock, sheared and fallen structure, plane mechanical model, instability criterion, working resistance of hydraulic support

中图分类号: 

  • TD821
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