节理岩体变形模量估算新方法

A NEW METHOD FOR EVALUATE OF MODULI OF JOINTED ROCK MASS

The deformation moduli of jointed rock mass is a very important input data in rock engineering. There are three approches to determine this parameter, i.e., in-situ test, empirical and analytical decomposition models. The first one is restricted for its expensive and time consuming. Besides, the reliability of results is still a problem due to size effect. The second one can give a mean value with a very simple and economical way. However, the precision can not be answered because of the sample number. Therefore, the third one is focused by all over the world. A new analytical decomposition model is introduced to assess moduli of jointed rock mass in this paper.Joint geometry is reviewed breifly and joint tensor is defined to describe joint geometry characteristics quantitatively. A stress-strain contructive equation of jointed rock mass is establised up based on the concept of equivalent strain,which can lead to an equation to pridict moduli with orientation. It is demonstrated that it is a quite reasonable way in the practice use.