煤炭工程 ›› 2026, Vol. 58 ›› Issue (3): 130-137.doi: 10.11799/ce202603016

• 生产技术 • 上一篇    下一篇

推进速度效应下弱胶结覆岩损伤特征研究

彭宝山,王永乐,杨学孟,潘卫东,刘世奇,张 村   

  1. 1. 国网能源新疆准东煤电有限公司,新疆 昌吉 831800

    2. 中国矿业大学(北京)能源与矿业学院,北京 100083

  • 收稿日期:2024-10-28 修回日期:2025-11-26 出版日期:2026-03-10 发布日期:2026-04-14
  • 通讯作者: 王永乐 E-mail:wyongle2022@163.com

Study on damage characteristics of weakly cemented overburden rock under the effect of advancing speed #br#

  • Received:2024-10-28 Revised:2025-11-26 Online:2026-03-10 Published:2026-04-14

摘要:

以新疆准东二矿为工程背景,选取典型弱胶结覆岩1101综放工作面为研究对象,通过数值模拟和现场实测的方法,对高强度开采下上覆岩层损伤特征的推进速度效应进行研究。结果表明:数值模拟结果表明1101工作面上覆岩塑性区发育高度181.53m;覆岩损伤度与塑性区发育高度随工作面推进速度的增加而减小。在推进速度由3m/d增大至10 m/d过程中,覆岩损伤度由最初21.66%降低至12.07%,整体降低了9.59%。当推进速度为7m/d时覆岩损伤度变化速率最快。通过现场实测支架工作阻力演化特征得出:在一定范围内推进速度增大, 工作面周期来压步距随之增大平均推进速度2.5m/d和3.5m/d对应平均周期来压步距分别为18m和23.4m,确保支架工作阻力最佳状态的推进速度为5m/d。微震数据表明上覆岩层导水裂隙带最大高度191m,且发育趋势与数值模拟结果基本一致, 覆岩损伤发育经历“低速发育-快速发育-稳定发育”三个阶段。综合数值模拟、工作面矿压显现和微震结果可知,准东二矿1101工作面在开采见方后,工作面推进速度的增加能够有效降低覆岩损伤发育情况、强矿压显现和微震能量响应特征,综合考虑工作面推进速度控制在3.5~5m/d为宜。

关键词: 弱胶结覆岩, 综放开采, 覆岩损伤度, 推进速度, 矿压显现

Abstract:

Taking Xinjiang Zhundong No.2 Mine as the engineering background, the typical weakly cemented overburden 1101 fully mechanized caving face is selected as the research object. Through numerical simulation and field measurement, the advancing speed effect of the damage characteristics of the overlying strata under high-intensity mining is studied. The results show that: (1) The numerical simulation results show that the development height of the plastic zone of the overlying rock on the 1101 working face is 181.53m ; the damage degree of overburden rock and the development height of plastic zone decrease with the increase of working face advancing speed. In the process of advancing speed from 3 m / d to 10 m / d, the damage degree of overburden rock decreases from 21.66 % to 12.07 %, which decreases by 9.59 % as a whole. When the advancing speed is 7 m / d, the change rate of overburden rock damage degree is the fastest, and it is considered that the advancing speed of working face is 7 m / d. (2) The relationship between the mine pressure behavior and the advancing speed of the working face is obtained by the field measurement. Within a certain range, the greater the advancing speed, the greater the periodic weighting step distance of the working face. The average advancing speed is 2.5 m / d and 3.5 m / d, and the corresponding average periodic weighting step distance is 18 m and 23.4 m, respectively. The advancing speed to ensure the best state of the support resistance is 5 m / d. (3) Microseismic data indicate that the maximum height of the water-conducting fracture zone in the overlying rock layer is 191 meters, and the development trend is basically consistent with the numerical simulation results. The damage development of the overlying rock has gone through three stages: "low-speed development stage - rapid development stage - stable development stage". (4) Based on the results of numerical simulation, mine pressure behavior and microseismic response, it is considered that the increase of working face advancing speed can effectively reduce the development of overburden damage, strong mine pressure behavior and microseismic energy response characteristics after the 1101 working face of Zhundong No.2 Coal Mine is mined and squared. It is advisable to control the advancing speed of the working face at 3.5 ~ 5 m / d.

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