(1. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；2. School of Civil Engineering， Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Based on the failure mechanism of jointed rock mass under shear loading，a new constitutive model is presented；the essence of which is dilatancy softening phenomenon and strengthening phenomenon that should be considered separately when asperity surface will undergo the wearing，grinding and crushing. From many direct shear tests，it is concluded that the jointed rock mass will generate dilatancy and wear as the behavior of overriding and shearing for asperity surface under normal and shear loadings. When damage is accumulated to a certain extent，it will result in softening. A new concept of initial shear stress is introduced to reflect the above characteristics. On the other hand，as the motion of broken granules，the mechanical behavior of shear which is controlled by asperities will gradually transform to compact controlled layer；and it makes shear strength increase. This microscopic change effects are described by considering elastoplastic kinematic hardening model. The constitutive equations are derived with combining kinematic hardening model and initial shear stress. The validity of proposed constitutive model is verified through applications to several existing laboratory test results on intact and artificial jointed rocks.
肖卫国，兑关锁，陈铁林，任青文. 剪胀和破坏耦合的节理岩体本构模型的研究[J]. 岩石力学与工程学报, 2009, 28(12): 2535-2543.
XIAO Weiguo1，DUI Guansuo1，CHEN Tielin1，REN Qingwen2. A STUDY OF CONSTITUTIVE MODEL COUPLING DILATANCY AND DEGRADATION FOR JOINTED ROCK . , 2009, 28(12): 2535-2543.
