考虑张开型节理倾角的修正岩体真三轴强度准则OA
Modified true triaxial strength criterion considering the dip angle of open-jointed rock mass
为了研究节理倾角对岩体真三轴强度的影响,以张开型节理岩体为研究对象,基于3种现有经典岩石强度准则,建立了黏聚力、内摩擦角与节理倾角之间的关系模型,进而提出了考虑张开型节理倾角的修正岩体真三轴强度准则.在此基础上,根据室内试验和数值模拟数据,分析对比了现有经典强度准则、修正后强度准则与其他2种考虑岩体节理的强度准则预测结果,验证了修正真三轴强度准则的合理性.研究结果表明:与经典强度准则相比,修正后的3种强度准则的预测误差均大幅降低,其相对误差最多可下降236.95个百分点,其中,修正MG-C准则的预测效果最好,其次为修正MW-C准则和修正D-P准则;现有的2种考虑岩体节理的强度准则均无法客观反映节理倾角对岩体真三轴强度的影响,其最大误差达136.35%,预测效果不理想;修正岩体真三轴强度准则通过改进原有经典强度准则中的岩体强度参数,仅需开展少量真三轴室内试验便可获取任意节理倾角和应力状态下的岩体真三轴强度,准确性较高,可操作性和实际工程可预测性较强,可为含节理岩体稳定性与强度评估提供理论指导.
In order to consider the influence of joint dip angle on true triaxial strength of rock mass,taking open jointed rock mass as the research object,based on three existing classical true triaxial strength criteria,and the correlation between cohesion,internal friction angle and joint dip angle was established,and then the modified true triaxial strength criterion of rock mass considering open jointed dip angle was put forward.On this basis,according to the indoor test and numerical simulation data,the prediction results of existing classical true triaxial strength criterion,the modified true triaxial strength criterion and the other two strength criteria considering rock joints were analyzed and compared,which verified the rationality of the modified true triaxial strength criterion.The results show that compared with the classical strength criteria,the prediction errors of the three modified strength criteria are greatly reduced,and the error percentage can be decreased by 236.95 percentage points.Among them,the modified MG-C criterion has the best prediction effect,followed by the modified MW-C criterion and the modified D-P criterion.In addition,the two existing strength criteria considering the joint of rock mass can not objectively reflect the influence of joint dip angle on the true triaxial strength of rock mass,and the maximum error percentage is 136.35%,so the prediction effect is not ideal.The modified true triaxial strength criterion of rock mass focuses on improving the strength parameters of rock mass in the original classical strength criterion,the true triaxial strength value of rock mass at any joint dip angle and stress state can be obtained only by carrying out a few true triaxial indoor tests,which has high accuracy,operability and predictability in practical engineering.The research results can provide theoretical guidance for stability and strength evaluation of jointed rock mass.
冯帆;张彤;陈绍杰;朱泉企;苏晓丽
山东科技大学能源与矿业工程学院,山东 青岛,266590山东科技大学能源与矿业工程学院,山东 青岛,266590山东科技大学能源与矿业工程学院,山东 青岛,266590中南大学资源与安全工程学院,湖南 长沙,410083蒙纳士大学土木工程系,澳大利亚墨尔本,3800
建筑与水利
岩体强度准则张开型节理节理倾角真三轴
rock masstrue triaxial strength criterionopen jointjoint dip angletrue triaxial stress state
《中南大学学报（自然科学版）》 2026 (2)
845-858,14
国家自然科学基金资助项目(52374095)山东省高等学校青创科技支持计划项目(2024KJH068)山东省自然科学基金青年科学基金(B类)资助项目(ZR2025QB45)(Project(52374095)supported by the National Natural Science Foundation of ChinaProject(2024KJH068)supported by the Youth Innovation Team Science and Technology Support Program for Higher Education Institutions of Shandong ProvinceProject(ZR2025QB45)supported by the Natural Science Youth Science Foundation(category B)of Shandong Province)
评论