应变型岩爆物理模拟实验过程的温度特征  

Temperature characteristics during physical simulation test of strain burst

作　　者：何满潮[1] 任富强[1,2] 宫伟力[1] 王琳琳[3] 

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]中国石油大学(北京)石油工程学院,北京102249

出　　处：《中国矿业大学学报》2017年第4期692-698,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41502323)

摘　　要：利用红外热成像技术对花岗岩室内岩爆模拟过程中卸载面的温度场演变进行了实验研究.岩爆实验共进行了5次循环加卸载,其中,第1次卸载后的红外辐射平均温度相比于实验前有所下降.实验结果表明:在应变能累积阶段,红外辐射平均温度随应力增加而升高.在损伤演化阶段,伴随有裂纹的开展,这个过程会使岩体的局部温度小幅升高.在弹射阶段,岩体局部温度的增幅大于损伤演化阶段.岩爆模拟过程中裂纹的扩展产生的局部温度增幅要远大于发生弹射的局部温度增幅.通过利用红外热成像技术能够量测到岩爆实验过程中试样表面的裂纹扩展过程并建立温度增幅与裂纹长度的定量关系.The paper was devoted to the investigation of temperature evolution during a labora- tory granite strain-burst test by using infrared thermography. The test was performed follow- ing five load-unloading cycles. During the first unloading, there was a decrease of the initial temperature. The results indicates that the average radiation temperature is increasing with stress level due to strain energy accumulated. During the damage stage, the propagation of cracks result in slightly increment of local temperature. During the ejection stage, the incre- ment of local temperature is larger than during the previous stage. Finally, during the test, the increment of local temperature caused by cracks is much larger than caused by ejections. By u- sing the infrared thermography, it is possible to measure the crack evolution on the surface and to establish a relation between the increase of temperature and the length of cracks.

关 键 词：应变型岩爆 红外热成像 温度变化 裂纹开展 碎屑弹射 

分 类 号：TD45[矿业工程—矿山机电]