基于微震监测的浅埋8 m超大采高综采面末采阶段矿压显现规律研究  

Research on Law of Mine Pressure in Shallow Buried 8 m Super LargeMining Height Fully-mechanized Mining Face Based on MicroseismicMonitoring

作　　者：焦金照 任建喜[1] 张琨[1] 胡俭 范生军 毛小娃 JIAO Jinzhao;REN Jianxi;ZHANG Kun;HU Jian;FAN Shengjun;MAO Xiaowa(Institute of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,China;Shenmu Zhangjiamao Mining Co.,Ltd.,Shaanxi Coal Group,Yulin 719300,China)

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054 [2]陕煤集团神木张家峁矿业有限公司,陕西榆林719300

出　　处：《煤炭技术》2024年第9期1-5,共5页Coal Technology

基　　金：陕西省自然科学基础研究计划-陕煤联合基金(2019JLP-01)资助。

摘　　要：为了掌握浅埋超大采高综采面末采阶段矿压显现规律,以张家峁煤矿8 m超大采高综采面为研究背景,在工作面支架压力监测数据的基础上,引入微震监测技术手段,从微震事件数量和能量的角度对末采阶段矿压规律做出合理解释。得出如下结论:2203综采面末采最后90 m范围内共监测到微震事件66个,总能量1.75×10^(4)J,其中,中小能量事件合计占比达到92%。期间共来压5次,平均周期来压步距为19.5 m,来压持续距离2.9 m,动载系数1.46,周期来压具有来压步距短、持续时间长、局部动载矿压强烈的特点。来压期间微震的频次和能量明显高于未来压期间,微震频次和总能量的变化趋势呈现“M”形,表现为能量的“积聚-释放-积聚”的周期性变化,微震事件的周期性变化规律与工作面的周期来压保持一致。根据微震频次和能量的异常变化可对工作面的周期来压起到一定的预测作用。In order to grasp the law of mine pressure in the final mining stage of shallow buried super large mining height fully-mechanized mining face,taking the 8 m super large mining height fully-mechanized mining face of Zhangjiamao coal mine as the research background,based on the monitoring data of support pressure in the working face,the microseismic monitoring technology is introduced to make a reasonable explanation of the law of mine pressure in the final mining stage from the perspective of the number and energy of microseismic events.The following conclusions are drawn:A total of 66 microseismic events were monitored in the last 90 m range of 2203 fully-mechanized mining face,with a total energy of 1.75×10^(4)J,of which the total proportion of small and medium energy events reached 92%.During the period,there were 5 times of weighting,the average periodic weighting step was 19.5 m,the duration of weighting was 2.9 m,and the dynamic load coefficient was 1.46.The periodic weighting has the characteristics of short weighting step,long duration and strong local dynamic load.The frequency and energy of microseismicevents during the pressure period are significantly higher than those during the future pressure period.The change trend of microseismic frequency and total energy shows a"M"shape,which is characterized by the periodic change of"accumulation-release-accumulation"of energy.The periodic change law of microseismic events is consistent with the periodic pressure of the working face.According to the abnormal changes of microseismic frequency and energy,it can play a certain role in predicting the periodic weighting of the working face.

关 键 词：浅埋煤层 8 m超大采高 微震 末采阶段 矿压显现规律 

分 类 号：TD323[矿业工程—矿井建设]