高温水冷作用下花岗岩巴西劈裂试验及启裂模式研究  

Study on Brazilian Splitting Test and Crack Initiation Mode of Granite Under High Temperature-Water Cooling Treatment

作　　者：郭沛 吴顺川[1,2] 方旭刚 孙贝贝 汪小东 GUO Pei;WU Shunchuan;FANG Xugang;SUN Beibei;WANG Xiaodong(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China;Huize Mining Company,Yunnan Chihong Zinc and Germanium Co.,Ltd.,Qujing,Yunnan 654200,China;CINF Engineering Co.,Ltd.,Changsha,Hunan 410019,China)

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]云南驰宏锌锗股份有限公司会泽矿业分公司,云南曲靖市654200 [4]长沙有色冶金设计研究院有限公司,湖南长沙410019

出　　处：《矿业研究与开发》2023年第6期108-114,共7页Mining Research and Development

基　　金：国家自然科学基金资助项目(51934003);云南省重大科技专项计划项目(202102AG050024).

摘　　要：在深部采矿、超深钻井、增强型地热系统(EGS)等工程中,高温岩体受冷水热冲击产生损伤,热损伤岩体的物理力学性质受到了广泛关注。通过对经200~800℃高温水冷处理后的花岗岩圆盘进行巴西劈裂试验,发现高温水冷作用使花岗岩体积膨胀、P波速度降低、抗拉强度减小。通过对圆盘加载过程中的表面应变场监测和声发射监测,发现高温处理会使花岗岩圆盘的启裂模式发生变化。较低温度(400℃以下)处理后圆盘为端部启裂,较高温度(600℃和800℃)处理后圆盘为中心启裂。热冲击导致花岗岩微裂纹增加,使巴西劈裂过程中的b值随处理温度升高而增大。In deep mining,ultra-deep drilling,enhanced geothermal system(EGS)and other projects,high-temperature rock mass is damaged by thermal shock of cold water,and the physical and mechanical properties of thermally damaged rock mass have been widely concerned.Through the Brazilian splitting test of the granite discs after high temperature-water cooling treatment at 200800℃,it is found that the high temperature-water cooling effect would lead to the volume expansion of the granite,the decrease of P wave velocity and the decrease of tensile strength.By monitoring the surface strain field and acoustic emission during the loading process,it is found that high-temperature treatment will change the crack initiation mode of granite discs.After low-temperature(below 400℃)treatment,crack initiation is at the end of the disc,and after high-temperature(600℃and 800℃)treatment,crack initiation is at the center of the disc.Thermal shock leads to the increase of microcracks in granite,which makes the b-value increase with the increase of treatment temperature.

关 键 词：花岗岩 巴西劈裂试验 热冲击 声发射 启裂模式 

分 类 号：TD313[矿业工程—矿井建设] TD315