摘要
现有应力监测方式采用钻孔监测,为实现深部钻孔应力计布置时,煤岩体采动应力峰值状态变化过程监测以及考虑钻孔卸压前提下深部煤岩体能量变化的稳定性,通过赵楼煤矿7303工作面获得煤岩体力学参数,并基于应变软化模型,计算煤岩体应力计布置时钻孔卸压导致的煤岩体能量变化规律,同时对比现场布置深部应力计监测实际应力变化过程,得出深部应力峰值区域可释放弹性能与其储能极限的关系,并得出符合赵楼7303工作面的深部应力监测预警判别指标。实验室试验及理论分析表明,工作面巷道的破碎区范围约为4.72 m、巷道的弹塑性交界处约为17.12 m,与现场实测的应力峰值14~20 m具有一致性;深部应力单个钻孔布置使应力峰值的能量降低了约13.3%;通过FLAC^(3D)模拟得出,峰值应力约为23.6 MPa,随着监测布置深度增大,垂直应力逐渐降低;以单轴压缩曲线峰前曲线的80%视作其进入弹塑性阶段为依据,得出能量预警指标k,k≥80%为红色预警,60%≤k<80%为橙色预警,40%≤k<60%为黄色预警,k<40%为蓝色预警。通过现场实测,煤体深部峰值应力区域测点应力值增量Δσ得出可释放应变能,7303工作面的测站5进入黄色预警状态。
The existing stress monitoring method adopts drilling monitoring.In order to monitor the change process of mining stress peak state of coal and rock mass when the stress gauge is arranged in deep drilling,and consider the stability of energy change of deep coal and rock mass under the premise of drilling pressure relief,mechanical parameters of coal and rock mass were obtained from the No.7303 working face of Zhaolou Coal Mine,and the stress gauge arrangement of coal and rock mass was calculated based on the strain softening model.The energy change law of coal and rock mass caused by drilling pressure relief,and the relationship between the elastic energy that can be released in the deep stress peak area and its energy storage limit were obtained by comparing the actual stress change process monitored by deep stress meters arranged in the field,and the early warning and discrimination indicators of deep stress monitoring in line with the No.7303 working face of Zhaolou Coal Mine were obtained.Laboratory test and theoretical analysis indicate,it is concluded that the crushing zone of the working face roadway is about 4.72 m,and the elastic-plastic junction of the roadway is about 17.12 m,which is consistent with the stress peak value of 14-20 m measured in the field;the stress peak energy is reduced by 13.3%due to the deep stress single drilling arrangement;according to the FLAC^(3D)simulation,the peak stress is about 23.6 MPa,and the vertical stress decreases gradually with the increase of monitoring layout depth;according to 80%of the pre-peak curve of uniaxial compression curve,it is considered that the uniaxial compression curve has entered the elastoplastic stage,and the energy warning indicator k is obtained,k≥80%is a red warning,60%≤k<80%is a orange warning,40%≤k<60%is a yellow warning;k<40%is a blue warning;through the field measurement,the strain energy can be released by incrementΔσof the stress value of the measuring point in the peak stress region of the deep coal body,and the No.5 measuring station of the No.7303 working face enters the yellow warning state.
作者
王光民
王超
赵西坡
李占成
王泽雨
夏方迁
Wang Guangmin;Wang Chao;Zhao Xipo;Li Zhancheng;Wang Zeyu;Xia Fangqian(Yankuang Energy Group Company Limited,Jining 272000,China;Ordos Yinpanhao Coal Co.,Ltd.,Ordos 017000,China;Beijing Anke Technology Co.,Ltd.,Beijing 102200,China)
出处
《能源与环保》
2025年第5期94-101,109,共9页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
山东省重大科技创新工程项目(2019SDZY020402)。
关键词
单轴压缩
弹性应变能
储能极限
深部应力监测
预警指标
uniaxial compression
elastic strain energy
energy storage limit
deep stress monitoring
early warning indicators
