{"title":"Effects of bedding plane dip angle and lithology on the mechanical and micro-failure behavior of stratified rock under uniaxial compression test","authors":"Yaoyao Meng, Hao Chen, Hongwen Jing, Qian Yin, Xiaowei Liu, Ke Ding","doi":"10.1007/s00419-024-02754-8","DOIUrl":null,"url":null,"abstract":"<div><p>To investigate the mechanical and micro-failure behavior of stratified rock, a series of uniaxial compression and CT scanning tests of stratified limestone and sandstone at different bedding plane dip angles (<i>α</i>) were conducted. The experimental results showed that with the increasing <i>α</i>, uniaxial compressive strength (UCS), peak strain (<i>ε</i><sub>1p</sub>), Poisson’s ratio (<i>μ</i>) of stratified limestone and sandstone all first decreased and then increased, elastic modulus (<i>E</i>) of stratified limestone continuously increased, <i>E</i> of stratified sandstone first decreased and then increased. At different <i>α</i>, UCS and <i>E</i> of stratified limestone were larger than that of stratified sandstone, <i>ε</i><sub>1p</sub> and <i>μ</i> of stratified limestone were smaller than that of stratified sandstone. For stratified limestone, anisotropy coefficient of <i>μ</i> was the largest and anisotropy coefficient of <i>E</i> was the smallest. For stratified sandstone, anisotropy coefficient of <i>ε</i><sub>1p</sub> was the largest and anisotropy coefficient of <i>E</i> was the smallest. Anisotropy degree of stratified limestone and sandstone was approaching for UCS. Anisotropy degree of stratified limestone was larger than stratified sandstone for <i>ε</i><sub>1p</sub> and <i>μ</i>. Anisotropy degree of stratified limestone was smaller than stratified sandstone for <i>E</i>. The failure category of stratified limestone and sandstone at different <i>α</i> was quite different. Due to differences in failure mode, the morphology and distribution characteristics of micro-cracks along the sample height showed a significant difference. With the increasing <i>α</i>, volume fraction (VF) and the maximum area fraction (AF) first decreased and then increased for stratified limestone, and showed no obvious change trend for stratified sandstone. At <i>α</i> = 0º, 30º, 90º, VF and the maximum AF of stratified limestone were significantly larger than that of stratified sandstone. At <i>α</i> = 60º, VF and the maximum AF of stratified sandstone were larger than that of stratified limestone.</p></div>","PeriodicalId":477,"journal":{"name":"Archive of Applied Mechanics","volume":"95 1","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Archive of Applied Mechanics","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s00419-024-02754-8","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MECHANICS","Score":null,"Total":0}
引用次数: 0
Abstract
To investigate the mechanical and micro-failure behavior of stratified rock, a series of uniaxial compression and CT scanning tests of stratified limestone and sandstone at different bedding plane dip angles (α) were conducted. The experimental results showed that with the increasing α, uniaxial compressive strength (UCS), peak strain (ε1p), Poisson’s ratio (μ) of stratified limestone and sandstone all first decreased and then increased, elastic modulus (E) of stratified limestone continuously increased, E of stratified sandstone first decreased and then increased. At different α, UCS and E of stratified limestone were larger than that of stratified sandstone, ε1p and μ of stratified limestone were smaller than that of stratified sandstone. For stratified limestone, anisotropy coefficient of μ was the largest and anisotropy coefficient of E was the smallest. For stratified sandstone, anisotropy coefficient of ε1p was the largest and anisotropy coefficient of E was the smallest. Anisotropy degree of stratified limestone and sandstone was approaching for UCS. Anisotropy degree of stratified limestone was larger than stratified sandstone for ε1p and μ. Anisotropy degree of stratified limestone was smaller than stratified sandstone for E. The failure category of stratified limestone and sandstone at different α was quite different. Due to differences in failure mode, the morphology and distribution characteristics of micro-cracks along the sample height showed a significant difference. With the increasing α, volume fraction (VF) and the maximum area fraction (AF) first decreased and then increased for stratified limestone, and showed no obvious change trend for stratified sandstone. At α = 0º, 30º, 90º, VF and the maximum AF of stratified limestone were significantly larger than that of stratified sandstone. At α = 60º, VF and the maximum AF of stratified sandstone were larger than that of stratified limestone.
期刊介绍：
Archive of Applied Mechanics serves as a platform to communicate original research of scholarly value in all branches of theoretical and applied mechanics, i.e., in solid and fluid mechanics, dynamics and vibrations. It focuses on continuum mechanics in general, structural mechanics, biomechanics, micro- and nano-mechanics as well as hydrodynamics. In particular, the following topics are emphasised: thermodynamics of materials, material modeling, multi-physics, mechanical properties of materials, homogenisation, phase transitions, fracture and damage mechanics, vibration, wave propagation experimental mechanics as well as machine learning techniques in the context of applied mechanics.
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