突出模拟前兆微震响应的双谱分布特征

发布时间：2018-04-23 12:23

本文选题：突出前兆微震响应 + 激发阶段　；参考：《煤炭学报》2017年05期

【摘要】：为揭示煤与瓦斯突出的前兆特征,进行了4次大型突出模拟试验,并用微震设备实时连续监测,深入分析突出激发阶段的微震响应信号,获得突出前兆微震事件分布、双谱估计及其时间演化等特征。结果表明:激发阶段微震信号主要集中在第6频带,其频响范围为1 250~1 500 Hz;前兆微震事件主要分布在活跃期,具有间歇发生的特点;双谱估计值数量级包括10~3,10~4,10~5,10~6和10~7m V~3,呈正态分布,但控制其发展趋势的是数量级为10~7m V~3的前兆微震事件;临突前有一段调整期,表现为低能量事件密集发生直至平静期出现,随即发生突出。调整期与突出强度、持续时间正相关,是预警煤与瓦斯突出的重要信息。
[Abstract]:In order to reveal the precursory characteristics of coal and gas outburst, four large-scale outburst simulation tests were carried out, and microseismic equipment was used to monitor the microseismic response signals in the stage of outburst excitation, and the distribution of outburst microseismic events was obtained. Bispectral estimation and its time evolution. The results show that the microseismic signals in the excitation stage are mainly concentrated in the sixth frequency band with the frequency response range of 1 250 ~ 1 500 Hz, and the precursor microseismic events are mainly distributed in the active period and have the characteristics of intermittent occurrence. The bispectral estimates are of the order of magnitude of 10 ~ (3), 10 ~ (10), 10 ~ (10), 10 ~ (10) and 10 ~ (7) m V ~ (3), showing a normal distribution, but the trend of its development is controlled by a precursor microearthquake event of 10 ~ 7 m V ~ (3), and there is a period of adjustment before the upsurge, which shows that the low energy event occurs intensively until the quiet period, and its development trend is controlled by the precursor microearthquake event of the order of 10 ~ 7 m V ~ (3). Then came prominence. The adjustment period is positively related to the outburst intensity and duration, which is an important information for early warning of coal and gas outburst.
【作者单位】：河南理工大学瓦斯地质与瓦斯治理国家重点实验室培育基地;河南理工大学安全科学与工程学院;中原经济区煤层(页岩)气河南省协同创新中心;
【基金】：国家自然科学基金资助项目(51374094,40872191)
【分类号】：TD713.2

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