单轴压缩下高温盐岩的力学特性研究  

MECHANICAL CHARACTERISTICS OF SALT ROCK SUBJECTED TO UNIAXIAL COMPRESSION AND HIGH TEMPERATURE

作　　者：翟松韬[1] 吴刚[2,3] 张渊[4] 吴雪萍[1] 

机构地区：[1]上海交通大学土木工程系,上海200240 [2]上海交通大学海洋水下工程科学研究院,上海200231 [3]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [4]淮阴工学院建筑工程学院,江苏淮安223001

出　　处：《岩石力学与工程学报》2014年第1期105-111,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40872180);中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1004)

摘　　要：对不同温度下（20℃～700℃）及高温后（100℃后，200℃后）喜马拉雅山盐岩进行单轴压缩破坏试验，获得其受高温作用的力学特征和破坏形态，探讨峰值应力、峰值应变和弹性模量的变化规律，并重点分析高温下其应力一应变曲线的特殊性。研究结果如下：当温度低于120℃时，盐岩的抗压强度和弹性模量随温度的升高而降低，120℃～200℃时，随温度的升高而增加；在较高温度下（500℃及以上），盐岩的内部结构发生突变，峰值应力大大降低；盐岩的应力一应变曲线在不同温度区间有较大差异，170℃是其发生突变的阈值；当温度为170℃～400℃时，盐岩呈现出明显的应变硬化特性；喜马拉雅山盐岩所能承受的极限温度不超过700℃；与同等高温下相比，经历100℃和200℃高温后的盐岩，其承载能力降低，变形及弹性模量较小，其内部出现较多裂纹，整体性较差。The uniaxial compression tests for Himalayas salt rock under different temperatures（20 ℃ - 700 ℃） and after high temperatures（after 100 ℃ and 200 ℃） were conducted to study mechanical characteristics and failure models. The variations of peak stress, peak strain and elastic modulus were analyzed, and especially focusing on the characteristics of stress-strain curves under high temperature. The research results show that, when the temperature is below 120 ℃, the compression strength and elastic modulus of salt rock decrease with temperature increasing, but increase when the temperature changes from 120 ℃ to 200 ℃. Under higher temperatures such as 500 ℃ or above, the internal structure of salt rock changes and the peak stress greatly reduces. The stress-strain curves of salt rock are quite different in different temperature ranges and 170 ℃ is a threshold temperature. When the temperature is 170 ℃ - 400 ℃, brittle characteristics no longer appears and salt rock shows significant strain hardening with increasing temperature. The limit temperature that Himalayas salt rock can withstand does not exceed 700 ~C. The carrying capacity of samples after high temperature of 100 ℃ and 200 ℃ is relative lower.Simultaneously, its deformation and elastic modulus are lower. There are more cracks and the integrity is inferior.

关 键 词：岩石力学 高温 盐岩 单轴压缩 力学特性 

分 类 号：TU45[建筑科学—岩土工程]