节理岩体蠕变特性研究

在已知岩石和节理蠕变规律的前提下，推导了节理岩体蠕变模型的一般表达式。假定岩石体积变形和节理法向压缩变形为弹性变形，忽略节理的剪胀现象，认为只有岩石畸变和节理剪切滑移与时间有关，从而推导了含三组相交节理的岩体蠕变模型及其参数。根据反演出的岩石和节理蠕变模型，计算了含三组相交节理的岩体在单轴应力作用下一些节理参数对岩体单轴蠕变的影响。分析表明，节理间距、剪胀系数以及节理夹角都对岩体的单轴蠕变变形有明显影响。节理间距越大，剪胀系数越大，节理夹角越小，节理岩体的单轴蠕变柔量也就越小，岩体的蠕变变形也越小。

Analysis of creep model of jointed rock

The generalized creep model for jointed rock is derived according to the creep model of rock and joint. With the prerequisite that volume strain of rock and compressive normal deformation of joint are elastic and with no account of shear dilatancy of joint the creep model of rock mass permeated by three sets of joints is derived to take account of viscoelastic deviatoric strain of rock and shear displacement of joint. With the creep models of rock and joints obtained by back analysis for experiment data the influence of some parameters on uniaxial creep of rock mass cut by three sets of intersected joints is analyzed. According to the above analysis the joint interval and shear dilatancy index and angle between two sets of joints have important effect on uniaxial creep of jointed rock. The axial creep compliance and creep deformation of jointed rock are decreased with the increase of joint interval and shear dilatancy index and with the decrease of angle between two sets of joints.