文献类型：期刊文献

中文题名：小尺寸岩样尺寸效应特性研究

英文题名：STUDY ON SIZE EFFECT CHARACTERISTICS OF SMALL SIZE ROCK SAMPLES

作者：陈银红[1];伍法权[1,2];乔磊[1,2];王兆远[1];周晓霞[1];伍劼[3]

机构：[1]绍兴文理学院,绍兴312000;[2]浙江省岩石力学与地质灾害重点实验室,绍兴312000;[3]浙江岩创科技有限公司,绍兴312000

年份：2023

卷号：31

期号：2

起止页码：460

中文期刊名：工程地质学报

外文期刊名：Journal of Engineering Geology

收录：CSTPCD、、CSCD2023_2024、北大核心、CSCD、北大核心2020

基金：国家自然科学基金项目(资助号:41831290);浙江省基础公益研究计划项目(资助号:LHQ20D020001)。

语种：中文

中文关键词：小尺寸岩样;岩性;强度与弹性参数;破坏形式;尺寸效应

外文关键词：Small size rock sample;Lithology;Strength and elastic parameters;Failure mode;Size effect

中文摘要：以直径20~50 mm,高径比为2︰1的粉砂岩、花岗岩和大理岩为研究对象,探讨尺寸变化和岩性对岩样应力-应变曲线、破坏、单轴抗压强度、弹性模量和泊松比的影响,并分析产生尺寸效应的原因。试验结果表明,随着尺寸的增大:3种岩样的应力-应变曲线吻合度逐渐增强;粉砂岩及大理岩的破坏形式由单斜面剪切破坏向X状共轭斜面剪切破坏发展,花岗岩主要以X状共轭斜面剪切破坏为主,破坏程度均逐渐增大;3种岩样的单轴抗压强度与弹性模量整体呈增大的趋势,且在直径20~30 mm之间增幅较大,30~50 mm之间增幅较小;不同岩样的破坏形式大致相同,但应力-应变曲线离散性、峰值后应力-应变曲线特征、破坏程度有所差别。泊松比无明确尺寸效应特征,使用电阻应变片式的局部测量方式并不能很好地反应岩石试件的变形特征。产生尺寸效应的主要原因为岩样本身的不均质性,其次为端部效应。

外文摘要：This paper takes siltstone,granite and marble with a diameter of 20~50mm and a height-diameter ratio of 2:1 as research objects.It examines the influence of size change and lithology on the stress-strain curve,the failure,the uniaxial compressive strength,the elastic modulus and the Poisson s ratio of the rock samples,and analyzes the causes of size effect.The test results show that with the increase of the size,the coincidence degree of the stress-strain curves of the three rock samples increases gradually.The failure mode of siltstone and marble develops from single inclined plane shear failure to X-shaped conjugate plane shear failure.The granite is mainly the X-shaped conjugate plane shear failure,and the failure degree increases gradually.The uniaxial compressive strength and elastic modulus of the three rock samples increase as a whole,and the increase rate is larger between 20 and 30mm,and smaller between 30 and 50mm.The failure modes of different rock samples are roughly the same,but the dispersion of stress-strain curve,the stress-strain curve characteristics after peak,and the degree of damage vary.Poisson s ratio has no definite size effect.The local measurement method of resistance strain gauge can not well reflect the deformation characteristics of rock specimen.The main reason for the size effect is the heterogeneity of rock sample,followed by the end effect.