含水煤岩变形破坏过程电荷感应和微震信号特征试验研究  

Charge induction and microseismic signal characteristics of the deformation and fracture process of moisture-containing coal and rock

作　　者：刘玉春 潘一山[1,4] 赵扬锋[1,2] 李兵[1] LIU Yuchun;PAN Yishan;ZHAO Yangfeng;LI Bing(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China;Liaoning Key Laboratory of Mine Subsidence Disaster Prevention and Control,Fuxin 123000,Liaoning,China;College of Science,Liaoning Technical University,Fuxin 123000,Liaoning,China;Institute of Disaster Rock Mechanics,Liaoning University,Shenyang 110036,Liaoning,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁省矿山沉陷灾害防治重点实验室,辽宁阜新123000 [3]辽宁工程技术大学理学院,辽宁阜新123000 [4]辽宁大学灾害岩体力学研究所,辽宁沈阳110036

出　　处：《实验力学》2023年第1期119-130,共12页Journal of Experimental Mechanics

基　　金：国家自然科学基金面上项目(51274114,51974150);辽宁省自然科学基金面上项目(2022-MS-401)。

摘　　要：为了监测煤层注水减弱煤层的冲击倾向性和底板突水增加矿井冲击危险性的效果,利用电荷感应和微震同步监测系统,对平顶山矿井的原煤和砂岩开展单轴压缩下不同含水率煤岩的电荷感应和微震监测试验,获得了不同含水率原煤和砂岩变形破裂过程的电荷感应和微震信号特征。试验结果表明:随着含水率的增大,煤岩峰值应力减小,冲击倾向性减弱,经过浸泡饱和后煤样的峰值应力和砂岩的峰值应力分别降低了21.8%和31.1%;随着含水率的增大,煤样变形破裂过程中产生的电荷感应和微震信号事件数都减小,信号强度也降低,电荷感应与微震信号均方值幅值减小,而砂岩变形破裂过程中产生的电荷感应和微震信号事件数却增多,信号强度也增强;煤岩变形破裂过程产生的电荷感应信号受水的影响比微震信号受水的影响大。煤层注水后有效降低了矿井的冲击危险性,煤层变形破裂过程产生的电荷感应和微震信号变弱;矿井底板突水时提高了矿井冲击危险性,从而底板变形破裂过程产生的电荷感应和微震信号增强。In order to monitor the effect of coal seam water injection on weakening coal seam burst tendency and the increase of mine impact risk by floor water inrush, the charge induction and microseismic synchronous comprehensive monitoring system is built. The uniaxial compression tests of the different moisture-containing coal and rock were conducted, the coal and rock samples were from the coal and sandstone of the Pingdingshan coal mine. The charge induction and microseismic signal characteristics of the deformation and fracture process of the different moisture-containing coal and rock were studied. The experimental results show that, with the increase of coal and rock moisture content, the peak stress of coal and rock decreases and burst tendency increases. After soaking and saturation of coal and rock, the water content of the coal sample increases more than that of sandstone. The peak stress of the coal sample decreases less than that of sandstone, by 21.8% and 31.1% respectively. Charge induction and microseismic signals are generated in the deformation and fracture process of the different moisture content coal and rock. With the increase of the coal moisture content, the event number and signal mean square amplitude of charge induction and microseismic signals in the deformation and fracture process of coal decrease, and the signal strength also decreases. With the increase of the sandstone moisture content, the event number of charge induction and microseismic signals in the deformation and fracture process increases, and the signal strength also increases. The influence of water on the charge induced signal produced in the deformation and fracture process of coal and rock is greater than that of the microseismic signal. After the coal seam is injected with water, the burst risk of the mine is effectively reduced, and the charge induction and microseismic signal generated in the process of coal seam deformation and fracture become weak. The floor water-inrush risk increases the burst risk of the mine, and the

关 键 词：岩石力学 含水煤岩 电荷感应 微震 信号特征 

分 类 号：TU45[建筑科学—岩土工程]