岩石储能极限演化模型与强度准则研究  

Study on rock energy storage limit evolution model and strength criterion

作　　者：刘继 郭建强[1] 王姣姣 张钦榕 LIU Ji;GUO Jianqiang;WANG Jiaojiao;ZHANG Qinrong(College of Civil Engineering,Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025

出　　处：《岩石力学与工程学报》2025年第1期140-151,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(41372356);贵州省自然科学基金(黔科合基础-ZK[2023]一般068)。

摘　　要：强度理论是岩土工程灾害防控的基础,传统强度理论在复杂应力状态下的适用性仍存在一定不足。针对岩石储能极限的演化机制,在已有理论基础上,通过引入能够反映罗德角的参数λ,建立复杂应力状态下岩石储能极限演化模型,采用该模型对4种特殊应力状态的分析揭示了岩石拉压强度不等及静水压力下可能破坏的现象。基于岩石储能极限演化模型,建立岩石强度准则,该准则可蜕化为D-P强度准则,且能够解决D-P强度准则不具有罗德角效应和拉剪区偏大的问题。4种岩石的真三轴试验数据验证表明新建立的强度准则具备较高的计算精度,平均误差为2%~12%,而D-P强度准则平均误差为18%~51%。相较于其他强度准则,从岩石储能极限角度建立的强度准则物理意义明确、精度较高,对岩石的破坏行为研究具有参考意义。Strength theory serves as the foundation for disaster prevention and control in geotechnical engineering,but the applicability of classical strength theories under complex stress states still has certain deficiencies.Focusing on the evolution mechanism of rock energy storage limit,and based on the existing theory,the evolution model of rock energy storage limit under complex stress state is established by introducing parametersλthat can reflect the influence of Lode angle.The analysis of four special stress states reveals the phenomenon of unequal tensile and compressive strength of rocks and possible failure under hydrostatic pressure.Based on the rock energy storage limit evolution model,a new rock strength criterion is established,which can be degenerated into the D-P strength criterion,and effectively addresses the deficiencies of the D-P strength criterion,namely the lack of Lode angle effect and the oversized tensile-shear region.Verification using true triaxial experimental data of four types of rocks shows that the newly established strength criterion exhibits high calculation accuracy,with an average error ranging from 2%to 12%,while the D-P strength criterion exhibits an average error ranging from 18%to 51%.Compared with other strength criteria,the strength criterion established from the perspective of rock energy storage limit has clear physical meaning and high accuracy,which holds reference significance for the study of rock failure behavior.

关 键 词：岩石力学 复杂应力状态 弹性应变能 储能极限 强度准则 

分 类 号：TU45[建筑科学—岩土工程]