高温后花岗岩密度及波动特性的试验研究  

Experimental Research on the Density and Wave Characteristics of Granite Rock after High-Temperature

作　　者：杜守继[1] 刘华[1] 陈浩华[1] 邱一平[1] 

机构地区：[1]上海交通大学建筑工程与力学学院,上海200030

出　　处：《上海交通大学学报》2003年第12期1900-1904,共5页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(50079012);教育部留学回国人员科研启动基金资助项目

摘　　要：测试了25块花岗岩试件在经历不同高温前后的密度、纵波波速等物理特性常数,并由测得的纵波波速间接计算出花岗岩的弹性模量,同时应用力学的常规压缩方法直接测试计算了岩石的弹性模量,分析了经历不同高温后花岗岩密度、纵波波速和弹性模量的变化情况.测试结果表明,经历高温后花岗岩的密度和纵波波速等物理特性常数与常温相比均有不同程度的减小,而且随加热温度的升高,减小的幅度增大,但是纵波波速的变化幅度要比密度的变化幅度大得多;根据物理特性常数计算的弹性模量的变化幅度要远大于根据力学常规压缩方法测试计算的弹性模量的变化幅度,这说明经历高温后岩石物理性质(纵波波速等)的变化比力学性质的变化更剧烈.The physical parameters (such as density and longitudinal wave speed) of 25 pieces of granite rock were measured before and after high-temperature. With the ultrasonic and conventional compression methods, the Young's modulus of granite rocks after high-temperature was determined. The change of density, longitudinal wave speed and Young's modulus after high temperature was analyzed. The results show that the parameters of physical characteristics decrease with the increase of temperature. The variation amplitude of longitudinal wave speed is much greater than that of the density. The Young's modulus gained by ultrasonic method decreases much more than one gained by conventional method, which means that the change of physical characteristics of granite rock is more severe than that of its mechanical characteristics after high-temperature.

关 键 词：高温后 花岗岩 密度 波动特性 弹性模量 

分 类 号：TU45[建筑科学—岩土工程]