摘要
为研究高温花岗岩在热冲击作用下渗透性能变化规律,对不同温度花岗岩试件在空气中自然冷却、在水中(20℃,60℃,100℃)热冲击冷却等4种冷却条件下的渗透率变化规律进行分析,借助热冲击因子对不同冷却温度的热冲击破坏进行定量表征,研究结果表明:热冲击作用下试件渗透率增加幅度与岩石温度的升高呈指数关系;冷却介质与高温岩石之间的温差和对流换热系数共同影响热冲击过程中热量交换的速率,进而影响到热冲击破坏的结果;热冲击因子可以作为衡量热冲击破坏能力的物理量,热冲击破坏后花岗岩的渗透率随热冲击因子单调增加且存在阈值,超过阈值后试件渗透率随热冲击因子的增加而大幅度增加。
In order to reveal the change law of permeability of high-temperature granite under thermal shock,the permeability of granite specimens at different temperatures was investigated under four cooling conditions:natural cooling in air and thermal shock cooling in water(20℃,60℃,100℃).The change rule was analyzed,and the thermal shock damage at different cooling temperatures was quantitatively characterized with the help of the'thermal shock factor'.The research results show that the increase in the permeability of specimen under thermal shock is exponentially related to the increase in rock temperature;cooling medium and the temperature difference between high-temperature rocks and the convective heat transfer coefficient together affect the rate of heat exchange during thermal shock process and then affect the result of thermal shock damage;the thermal shock factor can be used as a physical quantity to measure thermal shock damage ability;and the penetration of granite after thermal shock damage increases monotonously with the thermal shock factor to a threshold,after which the permeability of specimen increases greatly with the increase of the thermal shock factor.
作者
成泽鹏
郤保平
杨欣欣
何水鑫
李晓雪
CHENG Zepeng;XI Baoping;YANG Xinxin;HE Shuixin;LI Xiaoxue(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Insitu Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《太原理工大学学报》
CAS
北大核心
2021年第2期198-203,共6页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(51874207)
山西省自然科学基金资助项目(201701D121131)。
关键词
高温花岗岩
岩石热冲击作用
渗透率
冷却介质温度
high temperature granite
rock thermal shock
permeability
cooling medium temperature
