基于形状改变能密度的岩石强度准则研究  

RESEARCH ON ROCK STRENGTH CRITERION BASED ON SHAPE CHANGE ENERGY DENSITY

作　　者：王晓健[1] 彭立志 张亮亮 WANG Xiaojian;PENG Lizhi;ZHANG Liangliang(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《力学与实践》2024年第1期77-88,共12页Mechanics in Engineering

基　　金：安徽理工大学高层次引进人才科研启动基金项目(2022yjrc32);国家自然科学基金项目(51874005)资助。

摘　　要：分析砂岩在常规三轴压缩试验过程中弹性应变能密度、体积改变能密度和形状改变能密度的演化规律,根据峰值形状改变能密度与围压的线性变化关系建立形状改变能密度岩石强度准则。结果表明:(1)体积改变能密度与形状改变能密度,在峰前阶段逐渐增加,峰后急剧下降;(2)形状改变能密度强度准则参数物理意义明确,且可通过参数变换转化为经典的Hoek-Brown准则;(3)形状改变能密度强度准则计算结果与8种不同类型岩石的常规三轴压缩试验结果基本一致,验证了准则的精确性和适用性。The evolution of elastic strain energy density,volume change energy density and shape change energy density of sandstone in the process of conventional triaxial compression test were analyzed.And the rock strength criterion of shape change energy density was established according to the linear relationship between peak shape change energy density and confining pressure.The results indicate that:(1)The volume change energy density and shape change energy density gradually increase in the pre-peak stage and sharply decrease after the peak;(2)The parameters of the shape change energy density strength criterion have clear physical significance,and can be converted into the classical Hoek-Brown criterion by parameter transformation;(3)The calculation results of the shape change energy density strength criterion are basically consistent with the conventional triaxial compression test results of eight different types of rocks.The accuracy and applicability of the criterion were verified.

关 键 词：砂岩 能量演化 形状改变能密度 强度准则 

分 类 号：TU452[建筑科学—岩土工程]