摘要
对40块粗砂岩试件高温后的密度、纵波波速和抗拉强度变化规律进行了试验研究。结果表明,高温后粗砂岩的密度随试验温度的升高减小幅度很小,几乎可忽略不记;高温后试件中纵波波速的传播随温度升高基本呈线性降低,而减小率呈二次曲线规律变化;存在一个温度点R,使高温后试件的抗拉强度呈开口向下抛物线关系变化,且在R温度作用后试件抗拉强度达到最大;当试验温度大于700℃后,试件的抗拉强度变得很小,且当温度升高时变化幅度也很小。高温后纵波波速与抗拉强度关系复合2次曲线关系。
All of the variational law of density, longitudinal wave velocity and tensile strength of gritstone after high temperature are studied. The results show that the density of gritstone is decreased gradually as the temperature increasing; so that it can be ignored; the longitudinal wave velocity is linearly decreased when the temperature increasing, and decrease rate of it follows the law of conic; R is one temperature point, which makes the law of tensile strength of gritstone after high temperature follows the law of parabola; and the maximal tensile strength appears when the operative temperature is R. After the temperature is higher than 700 ℃, tensile strength is small and change range is small when the temperature is increased. Relation between longitudinal wave velocity and uniaxial tensile strength is quadratic curve after high temperature.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第4期1143-1146,1275,共5页
Rock and Soil Mechanics
基金
国家自然科学基金项目(50874124)
国家重点基础研究发展计划(973计划)(2005CB221502)
国家自然科学基金重点项目(50534080)
重庆市自然科学基金计划重点项目(CSTC
2008BA6028)
关键词
粗砂岩
高温
纵波波速
抗拉强度
gritstone
high temperature
longitudinal wave velocity
tensile strength
