水中快速冷却对花岗岩高温残余力学性能的影响  

Impact of rapid cooling in water on residual mechanical properties of granite under high temperature

作　　者：王朋[1] 陈有亮[1] 周雪莲[1] 郜珊珊[1] 赵卉子[1] 

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《水资源与水工程学报》2013年第3期54-57,63,共5页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(10872133;11010101024);上海市教委科研创新重点项目(11ZZ134)

摘　　要：通过研究20～800℃高温状态的花岗岩在自然冷却和水中快速冷却后的力学性能,分析了花岗岩随温度和冷却方式变化的破坏机理,从纵波波速、应力-应变曲线、单轴抗压强度、峰值应变和杨氏模量等方面探讨了水中快速冷却对花岗岩高温残余力学性能的影响。试验结果表明:花岗岩的纵波波速、单轴抗压强度和杨氏模量随经历温度的升高而衰减,水中快速冷却比自然冷却衰减的幅度更大。这说明温度越高,花岗岩的力学性能劣化越严重,水中快速冷却产生的热冲击加剧了花岗岩力学性能的劣化。花岗岩水中快速冷却后的峰值应变小于自然冷却后的峰值应变,说明高温状态的花岗岩水中快速冷却后,其脆性比自然冷却后更加明显。Though investigating the mechanical properties of granite cooled by nature cooling （in air） and rapid cooling （ in water） at the temperatures from 20 to 800℃ , the paper analyzed the failure mechanism of granite under various heating temperatures and cooling modes and discussed the effect of rapid cooling in water on residual mechanical properties of granite from longitudinal wave speed, stress - strain curve, uniaxial compressive strength, peak strain and Young＇s modulus. The results show that the longitudinal wave speed, uniaxial compressive strength and Young＇s modulus of granite decrease with the increase of temperature. The amount of decrement of them rapid cooled in water is more than that in nature air. The higher the temperature, the more severe the degradation of mechanical property is. The thermal shock generated by rapid cooling might exacerbates the deterioration of mechanical property of granite. The peak strain of granite under rapid cooling is less than that under natural cooling. The brittleness of granite is more obvious through rapid cooling in water than through natural cooling in air.

关 键 词：岩石力学 高温 快速冷却 力学性能 热冲击 

分 类 号：TV315[水利工程—水工结构工程] TU528[建筑科学—建筑技术科学]