不同尺寸裂隙岩石损伤破坏特性光弹性试验研究

谢璨; 李树忱; 晏勤; 李景龙; 赵世森

doi:10.11779/CJGE201803023

不同尺寸裂隙岩石损伤破坏特性光弹性试验研究 English Version

山东大学岩土与结构工程研究中心,山东济南 25006

基金项目: 国家自然科学基金面上项目（51379113）; 国家重点研发计划专项项目（2016YFC0600803）

详细信息

作者简介:
谢璨(1990-),女,博士研究生,主要从事岩石破坏机理以及数值计算方面的研究工作。E-mail:xiecansdu@163.com。

通讯作者:
李树忱，E-mail：shuchenli@sdu.edu.cn

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出版历程
- 收稿日期: 2017-03-05
- 发布日期: 2018-03-24

Photoelastic experiments on failure characteristics of fractured rock with different sizes

Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China

摘要

摘要: 为了充分认识试件尺寸与裂隙倾角对裂隙岩石损伤破坏的影响,开展了不同试件尺寸、不同裂隙倾角的光弹性单轴压缩试验。利用反射式光弹仪直观形象地记录试件损伤破坏全过程的彩色条纹变化,基于光学-应力定律计算得到裂隙岩石损伤破坏过程中试件表面的全场应力应变,分析岩石裂隙扩展失稳的尺寸效应及裂隙倾角对岩石强度及破坏模式的影响,研究裂隙岩石损伤—扩展—破坏的力学机制。试验结果表明：裂隙岩石单轴压缩的应力应变曲线可分为弹性阶段,塑性阶段,峰后软化阶段,残余阶段不明显;裂隙岩石峰前阶段的弹性模量随着试件高宽比的增加而增大,随着裂隙倾角的增加而减小;单轴抗压强度随着高宽比的增加呈减小趋势;峰后的软化阶段受试件尺寸与裂隙倾角的共同影响,裂隙倾角与高宽比越大,岩石的破坏越具有突然性,即脆性越明显;岩石损失破坏时最大应变与应力分布在预制裂纹中心,损伤首先从预制裂纹处发生。随着加载的不断进行,最大应变与应力的位置转变为裂纹的两端,逐渐向平行于轴向加载方向发展直至试件端部。岩石损失破坏时,最大应变与应力分布在预制裂纹中心,损伤首先从预制裂纹处发生。随着加载的不断进行,最大应变与应力的位置转变到裂纹的两端,裂纹逐渐向平行于轴向加载方向发展直至试件端部。
- 裂隙岩石 /
- 光弹性 /
- 尺寸效应 /
- 损伤破坏
Abstract: In order to fully study the effect of specimen size and crack dip angle on the failure mechanism of fractured rock, uniaxial compression tests on rocks with different specimen sizes and crack dip angles are performed. The whole stress and strain of specimen surface is calculated based on the optical-stress law. The effect of sizes and crack dip angles on rock strength and failure modes is analyzed, and the extension mechanism of fissures in the fractured rock is studied. The test results show that the uniaxial compression stress-strain curve of fractured rock can be divided into the elastic stage, plastic stage and post-peak softening stage, however, the residual stage is not obvious. The elastic modulus of fractured rock during pre-peak stage increases with the increase of height-width ratio of specimens and decreases with the increase of crack dip angles. The uniaxial compressive strength decreases with the increase of height-width ratio of specimens. The post-peak softening characteristics of fractured rock are influenced by crack dip angles and specimen sizes. The greater the crack dip angle and height-width ratio, the more sudden the failure, the more obvious the brittleness. The maximum strain and stress distribution is in the center of the pre-crack, and damage firstly occurs in the pre-crack. With the increase of stress level, the position of the maximum strain and stress propagates to the ends of the crack and extends to the direction of crack parallel to the axial load. The results may provide a theoretical basis for the establishment of constitutive model for fractured rock and the stability analysis of joint rock mass.
- fractured rock /
- photoelasticity /
- size effect /
- damage and fracture

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