轴向压力下砂岩波速的实验研究  

Experimental research on wave velocity under axial pressure

作　　者：杨宏峰[1] 施行觉[1] 

机构地区：[1]中国科学技术大学地球与空间科学学院,合肥230026

出　　处：《地球物理学进展》2004年第2期481-485,共5页Progress in Geophysics

基　　金：国家自然科学基金项目(No.40274057)资助.

摘　　要：　对轴向压力下的砂岩波速进行了实验研究.结果表明,波速随着压力的增加而增加,并且与加卸载循环有关.对非线性模量与应变的关系进行了拟合.用非线性模量来替代弹性模量,推导出了轴向压力下干燥砂岩样品的波速计算公式,得到了速度和应变的关系曲线.实验数据与理论曲线有较好的一致性.In this article, experimental researches are made on the wave velocity of sandstones under axial pressure. The results show that, the wave velocity will increase with the increase of pressure and is closely related to the circulation of loading and unloading. The fitting is also made on the relations between the nonlinear modulus and strain. By replacing the traditional elastic model with the nonlinear model, the new formulas are deducted to calculate the wave velocity of dry sandstones under axial pressure and the relation curves of velocity and strain are given. The experimental data matches well with the theoretical curves.

关 键 词：轴向压力 砂岩 波速 非线性模 非线性模量 弹性模量 

分 类 号：P588.212.3[天文地球—岩石学]