加载砂岩破坏能量和红外前兆特征试验研究

Experimental Study on the Energy and Infrared Precursors of Failure Sandstone During Loading

红外热成像技术广泛应用于岩石破坏的前兆特征及预警方法研究。然而,红外辐射前兆特征具有多种形式,因此对岩石失稳的准确预警有一定的影响。岩石破坏失稳与应变能的演化存在密切联系,而岩石的红外辐射信息与应变能的耗散、释放有关。若将应变能与红外辐射信息相结合,则可准确地对岩石破坏失稳进行监测预警。以能量演化特征为切入点,采用尖点突变理论确定弹性应变能的释放时间,并将其与红外辐射异常信息相结合,确定了岩石破坏失稳的前兆。结果表明,当弹性应变能骤降时,红外辐射信息也发生突变;通过构建尖点突变模型预测的砂岩弹性应变能释放时间,超前或滞后于红外辐射首次突变时间;可将弹性应变能释放时间附近发生的红外辐射突变作为砂岩的破坏前兆。研究结果可为矿山灾害监测及预警提供一种新思路。

Infrared thermal imaging technology is widely used in the study of precursor characteristics and early warning methods of rock failure.However,infrared radiation precursory features have many forms,so it has certain influence on the accurate early warning of rock instability.The failure and instability of rock are closely related to the evolution of strain energy,and the infrared radiation information of rock is related to the dissipation and release of strain energy.If the strain energy is combined with infrared radiation information,the rock failure and instability can be monitored and warned accurately.Based on this,in this paper,the release time of elastic energy is determined by the cusp mutation theory based on the energy evolution characteristics,which is combined with the infrared radiation anomaly information to determine the precursor of rock failure and instability.The results show that with the sudden drop of the elastic energy curve,the infrared radiation synchronization appears abrupt change.The elastic energy release time of sandstone predicted by constructing the sharp point mutation model can be divided into two situations:leading and lagging the first mutation time of infrared radiation.Taking the elastic energy release time as the standard,the infrared radiation mutation near the sandstone can be regarded as the precursor of sandstone failure.The results can provide a new idea for mine disaster monitoring and early warning.