考虑第三偏应力不变量的岩石局部化变形预测模型  

PREDICTION MODEL OF LOCALIZATION DEFORMATION OF ROCKS CONSIDERING THE THIRD DEVIATIORIC STRESS INVARIANT

作　　者：李云祯[1,2] 黄涛[1] 戴本林[3] 蔡臣[1] 

机构地区：[1]西南交通大学环境科学与工程学院,四川成都610031 [2]美国西北大学土木与环境工程系,埃文斯顿il60208 [3]河海大学环境科学与工程学院,江苏南京210098

出　　处：《岩石力学与工程学报》2010年第7期1450-1456,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：留学回国人员科研启动基金资助(教外司留[2007]24)

摘　　要：现有岩石局部化变形带发生条件与带角预测模型均只考虑2个应力不变量,预测结果与实验观测结果关联度不好,最近的研究表明第三应力不变量在局部化变形中起重要的作用。在Rudnicki与Rice单屈服面和Issen双屈服面模型的基础上,通过相似角表征第三偏应力不变量,得到第三偏应力不变量相关性模型判断岩石局部化变形发生条件和预测变形带角,利用Mogi的Dunham白云岩轴对称拉伸和压缩状态以及Haimson的Westly花岗岩轴对称拉伸实验的变形带角属性作为边界条件,计算得到模型中的弹塑性参数,最后预测得到其他一般应力状态的变形带角,相较于二应力不变量模型,提高局部化变形带角的预测精度。Comparing with some other constitutive relations,which only consider the influence of two stress invariants,about the deformation behaviour of rocks,a model is proposed considering the influence of the third deviatoric stress invariant through a similar angle on the basis of Rudnicki and Rice（RR） single yield surface model and Issen two yield surface model.The model is used to obtain the determinant condition of the three types of deformation bands and band angles.The axisymmetric stress state data are chosen of Mogi′s experiment on Dunham-Dolomite and Haimson′s on Westly granite as boundary condition to deduce the elastoplastic parameters in the model,and then to predict the band angle of the other stress states.The results are compared with the data of Mogi′s true trixial test on Dunham-Dolomite,and it is found that the predictions are in reasonable agreement with the experiment data more than the two stress invariants model.

关 键 词：岩石力学 局部化变形 RR理论 Issen双屈服面模型 临界硬化模量 变形带角 第三应力不变量相关性模型 

分 类 号：TU45[建筑科学—岩土工程]