煤层底板导水通道微震信号辨识特征  

Identification Characteristics of Microseismic Signal of Water Channel in Coal Floor

作　　者：周金艳 陈为民 赵立松 ZHOU Jinyan;CHEN Weimin;ZHAO Lisong(Hebei Coal Science Research Institute Corporation Ltd.,Xingtai 054000,China;Hebei Province Key Laboratory of Mine Microseismic,Xingtai 054000,China;Jiulong Mine,Jizhong Energy Fengfeng Group Handan Baofeng Mining Corporation Ltd.,Handan 056200,China)

机构地区：[1]河北煤炭科学研究院有限公司,河北邢台054000 [2]河北省矿井微震重点实验室,河北邢台054000 [3]冀中能源峰峰集团邯郸宝峰矿业有限公司九龙矿,河北邯郸056200

出　　处：《煤炭技术》2022年第12期128-134,共7页Coal Technology

基　　金：河北省研发平台建设项目(21567638H);邢台市重大科技成果转化专项(2020ZZ010)。

摘　　要：分析在回采过程中煤层底板变形、破裂、渗流、构造活化等规律,研究导水通道发育特征和防治技术,一直是煤矿进行安全生产过程中非常重要的任务。以九龙矿15249S工作面为例,采用微震监测技术对其破裂信号进行了实时、全范围捕捉,对其下方4煤工作面导水通道形成过程中微震事件时、空、能演化规律进行了总结分析。主要结论:对于煤层底板导水通道形成,微震信号辨识特征明显。微震事件频次变化率、深部事件频次及连续性因子、能量是在微震监测中重要的参数,结合工作面回采情况、地质条件,可及时、有效地对底板水害做出预警。通道孕育过程微震事件频次逐渐上升,深部事件从无到有,且连续性出现,平面上沿着地质薄弱区域分布。随着导水通道的形成,微震事件能量呈上升趋势,且随回采推进沿着工作面走向规律性地前移。It is always an important task to analyze the regularities of deformation, fracture, seepage and structural activation of coal seam floor in the process of mining, and to study the development characteristics and prevention technology of water channel in the process of coal mine safety production. Taking the 15249S working face of Jiulong mine as an example, the microseismic monitoring technology was used to capture the rupture signal in real time and in full range, and the evolution law of the time, space and energy of the floor microseismic events during the formation of the water diversion channel of the 4 coal working face below it was summarized and analyzed. The main conclusions are as follows: for the formation of coal seam floor water channel, the identification characteristics of microseismic signal are obvious. The change rate of microseismic event frequency, the event frequency and continuity factor of warning layer, and the energy are important parameters in microseismic monitoring. Combined with the mining situation and geological conditions of working face,the early warning of floor water damage can be made timely and effectively. The frequency of microseismic events in the process of channel incubation increased gradually, and the deep events appeared continuously and distributed along the geological weak areas on the plane. With the formation of water channel, the energy of microseismic event shows an upward trend, and moves forward along the working face trend with mining advance.

关 键 词：微震监测 底板 导水通道 频次 连续性因子 

分 类 号：TD745[矿业工程—矿井通风与安全]