煤岩破裂过程中应力对红外辐射的控制效应试验

发布时间：2018-07-05 15:17

本文选题：红外辐射 + 应力　；参考：《煤炭学报》2017年01期

【摘要】：煤岩破裂是引发突水与煤柱失稳等矿山灾害的根本原因,准确有效地对煤岩受力破裂过程(裂隙发育过程)进行监测预警,是实现矿山保水开采和岩层控制的重要基础。煤岩在受力破裂过程中,伴随着应力调整会发生红外辐射变化,为探索应力变化与红外辐射变化之间的量化关系,提出煤样表面红外辐射方差突变系数新指标,进行煤单轴加载红外辐射观测实验研究。研究结果表明,应力对单轴加载煤样的红外辐射普遍具有控制效应,50 mm×50 mm×50 mm煤样表现出控制效应的比例约为93%;50 mm×50 mm×100 mm煤样表现出控制效应的比例约为85%。在红外辐射试验中,煤样表面红外辐射方差突变系数平均达到煤样应力调整系数的2个数量级,可运用此特征对承载煤岩体裂隙发育及破裂状况进行红外实时监测。同时,应力对红外射的控制效应具有时间滞后性,50 mm×50 mm×50 mm煤样的红外辐射方差突变平均滞后其应力调整时刻约2.7 s,50 mm×50 mm×100 mm煤样的红外辐射方差突变平均滞后其应力调整时刻约2.9 s。
[Abstract]:Coal and rock fracture is the fundamental cause of mine disasters such as water inrush and pillar instability. Monitoring and warning accurately and effectively the fracture process (fracture development process) of coal and rock is an important foundation for water conservation mining and strata control. In order to explore the quantitative relationship between the stress change and the infrared radiation change, a new index of variance mutation coefficient of infrared radiation on coal surface is put forward in order to explore the quantitative relationship between the stress change and infrared radiation change. The experimental study of infrared radiation observation under uniaxial loading of coal was carried out. The results show that the stress has a control effect on the infrared radiation of uniaxial loading coal samples generally. The proportion of 50 mm 脳 50 mm coal samples showing control effect is about 93mm 脳 50 mm 脳 100 mm coal samples. The proportion of controlling effect of 50 mm 脳 50 mm 脳 100 mm coal samples is about 85%. In the infrared radiation test, the coefficient of variance mutation of infrared radiation on coal surface is equal to two orders of magnitude of the coefficient of stress adjustment of coal sample, which can be used to monitor the fracture development and fracture state of bearing coal and rock mass in real time. meanwhile The control effect of stress on infrared radiation has the time-lag effect of 50 mm 脳 50 mm of coal samples. The mutation of infrared radiation variance lags behind the mean time of 2.7 s-1 50 mm 脳 50 mm 脳 100 mm of coal samples and the mean time of stress adjustment of the variation of infrared radiation variance of 50 mm 脳 50 mm 脳 100 mm coal samples is about 2.9 s.
【作者单位】：中国矿业大学矿业工程学院;中国矿业大学深部煤炭资源开采教育部重点实验室;College
【基金】：国家重点基础研究发展计划(973)资助项目(2015CB251600) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：TD315

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