摘要
作为一种非线性经验强度模型,Hoek-Brown(H-B)破坏准则有一定的适用条件。基于H-B破坏准则的基本公式,建议将围压范围0<σ3<0.5σc(σ3为岩石破坏时的最小主应力;σc为单轴抗压强度)作为其适用条件,在该条件下H-B破坏准则能较好地拟合岩石三轴压缩试验数据。进而采用一种新的完整岩石破坏准则与H-B破坏准则对几组岩石三轴压缩试验数据进行拟合,对比发现,在适用条件内,H-B破坏准则可较好地拟合岩石三轴压缩试验数据,然而将拟合延伸到高围压阶段会高估岩石强度,需引起注意;新模型可在较大围压范围内较好地拟合岩石三轴压缩试验数据,有更强的非线性能力和适用性。
As a non-linear empirical strength model,Hoek-Brown(H-B)failure criterion has a certain application condition.Based on the formula of H-B failure criterion,it suggests that confining pressure test data in the range of 0<σ3<0.5σccould be taken as an application condition.It is found that the H-B failure criterion can fit triaxial compression test data well.In order to verify the application condition of the H-B model,a new failure criterion for intact rocks and the H-B model are then used to fit several groups of triaxial compression test data.It is seen that the triaxial compression test data are well fitted using the H-B failure criterion when the application condition is satisfied.However,if the fitting results are extended to the high confined pressure region,the strength of rocks is usually overestimated.However,the new model can fit well the test data over a wide range of confining pressure.It indicates that the new model has stronger nonlinearity and wider applicability.
出处
《水电能源科学》
北大核心
2017年第7期129-133,共5页
Water Resources and Power
基金
国家自然科学基金项目(51609178)
中国博士后基金项目(2015M582273)
中央高校基本科研业务费专项资金(2042016kf0042)
