循环高温-快速冷却处理后的花岗岩力学特性及声发射响应特征  

MECHANICAL PROPERTIES AND ACOUSTIC EMISSION RESPONSE OF GRANITE AFTER TREATMENT OF CYCLIC HIGH TEMPERATURE AND RAPID COOLING

作　　者：谢晋勇 陈占清 吴疆宇[2] XIE Jinyong;CHEN Zhanqing;WU Jiangyu(School of Mechanics and Civil Engineering,China University of Mining&Technology,Xuzhou 221116,China;State Key Laboratory for Geomechanics&Deep Underground Engineering,China University of Mining&Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学力学与土木工程学院,徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,徐州221116

出　　处：《工程地质学报》2021年第2期508-515,共8页Journal of Engineering Geology

基　　金：国家自然科学基金重点基金项目(资助号:51734009);国家重点研发计划项目(资助号:2017YFC0603001);江苏省自然科学基金项目(资助号:BK20180663)。

摘　　要：基于温度、循环次数对花岗岩试样内部结构损伤的考虑,通过高温处理后的花岗岩单轴压缩试验和声发射监测试验,研究了循环高温-快速冷却后花岗岩力学性质和声发射响应特征。研究结果表明:随着对花岗岩施加温度和循环次数的升高,花岗岩单轴抗压强度不断降低,而单轴抗压强度对应的峰值应变随之增大,花岗岩岩样的塑性特征愈发明显。常温下与高温处理后花岗岩的声发射信号剧烈程度、分布特征存在明显区别。随着对花岗岩施加温度的升高,声发射计数率最大值和声发射累计振铃计数先增大后减小;随着对花岗岩冷热循环次数的升高,声发射计数率最大值和声发射累计振铃计数大致呈现减小的趋势,而声发射信号密集程度均呈现增大的趋势。Based on the consideration of the temperature and the number of cycles on the internal structure damage of the granite sample,we studied the mechanical properties and acoustic emission response characteristics of the granite after high temperature-rapid cooling cycles by the uniaxial compression test and the acoustic emission monitoring test.The results show the follows.As the temperature and number of cycles applied to the granite increase,the uniaxial compressive strength of the granite continued to decrease,and the peak strain corresponding to the uniaxial compressive strength increased accordingly.There was a clear difference in the intensity and distribution characteristics of the acoustic emission signal of granite between the normal temperature and the high temperature treatment.As the temperature applied to the granite increased,the maximum acoustic emission count rate and the cumulative ring count of the acoustic emission increased first and then decreased.With the increase of the number of heating-cooling cycles for granite,the maximum value of AE count rate and cumulative AE ring count tended to decrease,while the intensity of AE signal tended to increase.

关 键 词：花岗岩 循环高温 快速冷却 声发射 

分 类 号：P642.3[天文地球—工程地质学]