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以美国Therma CAM SC3000红外热像仪为观测手段,选取含孔花岗岩进行不同水平应力下巷道岩爆模拟实验,并结合数值模拟,对岩爆过程中应力分布和红外辐射温度变化特征进行了实验研究。结果表明:1)轴向应力与水平应力比值随着水平应力的增大而减小,水平应力越高,岩爆发生的最大主应力值也相应提高。2)岩爆发生的红外前兆时空演化特征:主破裂前,孔洞左右两侧平均红外辐射温度表现为突然升温型或略降转升型,对应的破裂机制分别为压剪破裂和先张拉后压剪的复合破裂形式;主破裂沿孔洞左右两侧高温异常条带扩展。3)岩爆过程中,孔洞上、下区域增温幅度比左右两侧低,增温较为稳定,孔洞上边区域AIRT均比孔洞下边区域高。4)水平应力越大,孔洞周围平均红外辐射温度越高。
Based on the Therma CAM SC3000 thermal imaging camera from the United States, rockburst simulation experiments of rock with different horizontal stresses are selected. The stress distribution and infrared radiation temperature variation during rockburst are experimentally studied . The results show that: 1) The ratio of axial stress to horizontal stress decreases with the increase of horizontal stress, and the higher horizontal stress increases the maximum principal stress of rock burst. 2) Before and after the main rupture, the average infrared radiation temperature on the left and right sides of the hole shows a sudden warming up or a slight turning up, and the corresponding rupture mechanisms are the compression shear rupture and pretensioning Compression shear the form of composite rupture; main rupture along the left and right sides of the hole high temperature anomalous strip expansion. 3) In the process of rockburst, the upper and lower area of the hole have a lower temperature increase rate than the left and right sides, and the temperature increase is stable. The AIRT in the area above the hole is higher than that in the area below the hole. 4) The greater the horizontal stress, the higher the average infrared radiation temperature around the hole.