新非线性强度准则在岩石材料中的应用

Application of new nonlinear strengh criterion to rock materials

在岩土体双剪强度理论的基础上,考虑中间主应力对岩石强度的影响效应存在区间性且影响程度与最小主应力大小有关,提出了一个岩石双剪强度准则的改进式。通过已有不同岩石的真三轴试验数据对新的非线性强度准则的验证表明:该强度准则可以广泛地适用于各类岩石,描述其子午面及σ1-σ2上的非线性强度特性;利用5种不同类型岩石真三轴试验结果对新的非线性强度理论和岩石非线性统一强度准则及深部岩体强度准则进行比较,反映了所提出的新岩石非线性强度准则的优越性。

Based on the twin shear strength theory of rock,considering the interval properties of the effect of intermodiate principal stress on rock strength and the degree of the effect releated to minimum principal stress,a improvement formula of the twin shear strength criterion was presented.The new nonlinear criterion for rocks was verified by triaxial compression test data of different rocks that were published.The result shows that the new nolinear criterion for rocks can be widely applied to kinds of rocks and can describe the charactreistics of nonlinear strength in the media plane and σ1-σ2 plane.Compared with the nonlinear unified strength criterion and strengh criterion of deep rock mass using test results of five different rock types under the three dimensional stress states,the advantages of the new nonlinear strengh criterion are emboidied.