砂岩高温前后超声特性的试验研究  

Experimental study on ultrasonic properties of sandstone before and after high temperature

作　　者：何国梁[1] 吴刚[1] 黄醒春[1] 张磊[1] 邱一平[1] 

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《岩土力学》2007年第4期779-784,共6页Rock and Soil Mechanics

基　　金：国家自然基金资助项目(40272115)

摘　　要：对焦作砂岩经历不同温度(100℃～1 200℃)前后超声纵、横波波速和几何尺寸进行了量测,进行了单轴抗压强度试验,计算了超声波纵波经过岩样的衰减系数,应用波速与弹性模量的关系计算了岩样的裂隙密度。比较了经历不同温度前后的岩样体积、超声波速、衰减系数的变化。结果表明,岩样在经历高温后内部微裂隙发展,使结构致密性下降,超声波速降低;对经历不同温度后的岩样波速改变与强度变化规律有明显差异,但超声衰减系数与强度变化规律相似,可以为强度评价提供一定参考。Ultrasonic velocities and dimensions of sandstone specimens from Jiaozuo that experience different temperature（100℃- 1 200℃） are measured; and their uniaxial strength are tested. P-wave attenuation coefficients of rock specimens are calculated. Crack densities are calculated using relations between ultrasonic velocity and elastic moduli. The volumes, ultrasonic velocities and attenuation coefficients of sandstone specimens before and after high temperature are compared. Results show that the cracks of sandstone specimens develop so that the compactness and ultrasonic velocities of specimens decline. For sandstone specimens that experience different temperature the changes of ultrasonic velocity and uniaxial strength are obviously discrepant. But changes of attenuation coefficients are similar to uniaxial strength. It can be taken as reference to evaluate uniaxial strength at a certain extent.

关 键 词：高温 砂岩 超声特性 裂隙密度 单轴抗压强度 

分 类 号：TU458.3[建筑科学—岩土工程]