摘要
波速作为岩石与岩体内部性质评价的一项重要指标,受应力与孔隙度的影响极为显著。为研究岩石波速随孔隙度和应力变化规律,开展两类不同孔隙砂岩的单轴加载声波联合测试。试验结果表明:砂岩的力学性质不仅取决于砂岩的孔隙度大小,而且受孔隙尺寸的影响也较为显著;孔隙闭合与裂纹扩展是导致砂岩波速发生变化的主要原因,前者对于波速变化的影响更为显著,后者则主要影响波速随应力的增长速率;不同孔隙砂岩的波速均随应力同步增长,在同一应力水平下,孔隙度越大的砂岩波速越低,波速增量越大;与整个加载阶段相比较,砂岩在孔隙压密阶段的波速随应力增长速率受孔隙度的影响更为显著。
As an important index to evaluate the internal properties of rock and rock mass,wave velocity is significantly affected by stress and porosity.In order to study the variation of rock wave velocity with porosity and stress,acoustic-wave combination tests of two kinds of sandstone with different pores under uniaxial loading are carried out.Test results show that:The mechanical properties of sandstone not only depend on the porosity of sandstone,but also are significantly affected by pore size.Pore closure and crack propagation are the main causes of the change of wave velocity in sandstones,and the former has a more significant effect on the change of wave velocity,while the latter mainly affects the change rate of wave velocity with stress.The wave velocity of sandstones with different pores increases synchronously with stress.At the same stress level,the wave velocity of sandstones with larger porosity decreases,and the wave velocity increment increases.In the whole loading process of sandstones,porosity has the most significant effect on the changing rate of wave velocity with stress at the first stage of pore compaction.
作者
杨爽
李化
邓建辉
付自国
Yang Shuang;Li Hua;Deng Jianhui;Fu Ziguo(Institute for Disaster Management and Reconstruction,Sichuan University-The Hong Kong Polytechnic University,Chengdu 610041,P.R.China;Key Laboratory of Deep Earth Science and Engineering,Sichuan University,Chengdu 610065,P.R.China;College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第6期1916-1921,共6页
Chinese Journal of Underground Space and Engineering
基金
中央高校基本科研业务费专项资金(2021SCU12038)
区域创新发展联合基金(U19A2098)
国家自然科学基金(42102320)。
关键词
砂岩
孔隙度
应力
波速
单轴加载
sandstone
porosity
stress
wave velocity
uniaxial loading
