高温遇水冷却石灰岩力学与声学性质研究

来源期刊:中南大学学报(自然科学版)2016年第12期

论文作者:黄真萍 张义 孙艳坤 刘成禹 吴伟达

文章页码:4181 - 4190

关键词:高温岩石;峰值强度;弹性模量;纵波波速;横波波速

Key words:high temperature rock; peak stress; elastic modulus; longitudinal wave velocity; shear wave velocity

摘    要:以石灰岩为研究对象,对加温遇水冷却后的岩样进行轴向压缩试验和声波测试,研究不同高温遇水冷却岩样的表观形态和力学性质的变化情况,分析力学与声学性质的关系。研究结果表明:随温度升高,高温遇水冷却干燥后岩样的颜色逐渐变浅,700 ℃时变为灰白色;峰值强度整体上呈减小趋势;当从常温升至500 ℃时,峰值应变逐渐增大,弹性模量和变形模量逐渐减小;高于500 ℃时,随温度升高,峰值应变先减小后增大,弹性模量和变形模量先增大后减小;随温度变化,弹性模量、峰值强度与纵波声波波速、横波声波波速间均呈现出良好的相关性。

Abstract: The axial direction compression and acoustic wave tests were carried out for different high temperature limestones with water cooling treatment. Both the changes of superficial morphology and mechanical properties and the relationship between the mechanical and acoustic characteristics were studied and analyzed. The results show that with the increase of temperature, the appearance color of the water cooling limestone fades gradually. When the temperature reaches 700 ℃, the appearance color of the water cooling limestone changes to hoar. The peak stress has a decreasing trend on the whole. When the temperature changes from room temperature to 500 ℃, the peak strain gradually increases, and the elastic and deformation modulus gradually reduces. When the temperature is more than 500 ℃, the peak strain decreases first and then increases, and the elastic and deformation modulus increase firstly and then decrease. With the increase of temperature, the relationships among the peak stress and the wave velocity, the elastic modulus and the wave velocity demonstrate good correlations.

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