董家河煤礦屬于中國(guó)華北石炭二疊紀(jì)煤田,該區(qū)域的巖溶、裂隙發(fā)育程度較高,其水害治理問(wèn)題一直受到學(xué)者們的廣泛關(guān)注。本文以董家河煤礦工作面為例,通過(guò)工作面布置的微震監(jiān)測(cè)系統(tǒng),采用矩張量理論反演了底板微震事件異常區(qū)域的震源機(jī)制解,通過(guò)應(yīng)力反演方法識(shí)別了底板隱伏斷層,并結(jié)合數(shù)值模擬獲取了底板的應(yīng)力場(chǎng)。結(jié)果表明:1)通過(guò)傳感器拾取的有效微震波形計(jì)算了突水危險(xiǎn)區(qū)域的矩張量,并在此基礎(chǔ)上將矩張量分解為三部分并結(jié)合相關(guān)判據(jù)得出該區(qū)域的主要破裂類型為混合破壞。2)通過(guò)震源機(jī)制中的初動(dòng)極性和應(yīng)力反演方法,確定了斷層的主要屬性,該隱伏斷層屬于逆斷層,其傾角大致為70°,破裂長(zhǎng)度為21 m。3)通過(guò)數(shù)值模擬方法結(jié)合微震事件的時(shí)空分布將斷層的破壞過(guò)程分為3個(gè)階段。其結(jié)果可為類似煤礦突水風(fēng)險(xiǎn)的預(yù)警和評(píng)估提供參考。 

【文章來(lái)源】：Journal of Central South University. 2020,27(10)EISCICSCD

【文章頁(yè)數(shù)】：16 頁(yè)

【文章目錄】：
1 Introduction
2 Moment tensor and focal mechanism inversion method
    2.1 Theory and calculation method of moment tensor
    2.2 Criterion of fracture type and its correspondingfracturesurface characteristics
3 Engineering background
    3.1 Project overview
    3.2 Site layout of microseismic monitoring system
4 Moment tensor inversion and analysis
    4.1 Moment tensor calculation process
    4.2 Inversion results of moment tensor
5 Numerical simulation
    5.1 Advantages of realistic failure process analysis (RFPA)
    5.2 Model building
    5.3 Law of fault failure
    5.4 Analysis of fault stress evolution
6 Analysis of water inflow and geological data at working face
7 Conclusions
Appendix A:Linear stress inversion method
Contributors
Conflict of interest


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