浅埋深坚硬顶板工作面冲击地压微震时空前兆信息特征

doi:10.11799/ce202202018

煤炭工程 ›› 2022, Vol. 54 ›› Issue (2): 98-104.doi: 10.11799/ce202202018

浅埋深坚硬顶板工作面冲击地压微震时空前兆信息特征

张传玖¹,薛雅荣²,杨伟³,李振雷⁴,李红平⁵,杨旭⁶,贾兵兵⁵

1. 国能神东煤炭集团布尔台煤矿
2. 北京科技大学
3. 新疆神华天电矿业有限公司
4. 中国矿业大学矿业工程学院
5. 宽沟煤矿
6. 神华新疆能源有限责任公司宽沟煤矿

收稿日期:2021-06-04 修回日期:2021-07-23 出版日期:2022-02-14 发布日期:2022-07-06
通讯作者: 薛雅荣 E-mail:bernicexue@126.com

Characteristics of microseismic spatio-temporal precursory information of rockburst in a shallow working face with hard roof

Received:2021-06-04 Revised:2021-07-23 Online:2022-02-14 Published:2022-07-06
Contact: 雅荣雅荣薛 E-mail:bernicexue@126.com

摘要/Abstract

摘要： 为提高冲击地压矿井现场防冲措施实施的针对性，以宽沟煤矿B2煤层I010203工作面为工程背景，研究其历次矿压显现事件发生前后的微震监测信息时空演化规律。结果表明：I010203工作面矿压显现事件震源位置受上层“刀把型”采空区边界影响，具有阶段性特征，且主要集中于工作面中下部、区段煤柱和侧向采空区围岩，垂向上大多位于煤体和顶板岩层中，坚硬顶板破裂是该矿发生冲击地压的主要诱导因素|在矿压显现事件发生前7d内微震前兆预警指标b值、断层总面积A〖DK〗(t〖DK〗)值和微震活动度S值分别出现突降或突增现象并保持低值或高值异常，表明煤岩体内部弹性能积聚、破裂程度增大，冲击危险性增高|结合高斯空间光滑法绘制的微震指标云图在矿压显现事件发生前呈现一定规律性，可进一步量化确定局部冲击危险区域。研究结果揭示了在坚硬顶板条件下工作面冲击地压微震时空前兆信息特征，可指导现场人员采取针对性防冲措施，有助于冲击地压的精准防治。

关键词: 冲击地压, 微震监测, 时空演化, 前兆特征, 高斯空间

Abstract: In order to improve the pertinence of the implementation of on-site prevention and control measures in rock burst mines, taking I010203 working face of B2 coal seam in a shallow buried hard roof coal mine as the engineering background, the temporal and spatial evolution law of microseismic monitoring information before and after the occurrence of previous large energy tremors was studied. The results show that: the focal position of large energy tremors in I010203 working face are affected by the upper "knife handle" goaf boundary, which have stage characteristics, and mainly concentrated in the middle and lower part of the working face, section coal pillar and surrounding rock of lateral goaf. Vertically, it is mostly located in coal and roof rock, and the fracture of hard roof is the main inducing factor of rock burst; within 7 days before the occurrence of the large energy tremor, the b value of the microseismic precursor warning factor, the A(t) value of the total fault area and the S value of the microseismic activity suddenly decrease or increase, respectively, and keep the low value or high value anomaly, indicating that the elastic energy accumulation and fracture degree increase in the coal and rock mass, and the rockburst risk increases; the microseismic factor contour drawn with spatially smoothed seismicity method presents certain regularity before the occurrence of large energy tremors, which can further quantify the local rockburst risk area. The research results reveal the spatio-temporal precursory information characteristics of rock burst under hard roof conditions, which can guide the field personnel to take targeted measures for rockburst risk, and contribute to the accurate prevention and control of rock burst in coal mine.

中图分类号:

TD353

张传玖, 薛雅荣, 杨伟, 李振雷, 李红平, 杨旭, 贾兵兵. 浅埋深坚硬顶板工作面冲击地压微震时空前兆信息特征[J]. 煤炭工程, 2022, 54(2): 98-104.

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浅埋深坚硬顶板工作面冲击地压微震时空前兆信息特征

Characteristics of microseismic spatio-temporal precursory information of rockburst in a shallow working face with hard roof

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