After the method of mean trace length estimation of rock mass joint was analyzed and summarized,the theory basis of mean trace length estimation by scanline method was extended.

The study indicates that the most of rock mass joints in Beishan,Gansu Province,are with shear joint with steep angle of inclination.

Orientation distribution of rock mass joints has been studied by scholars for about four decades,but the features of joint orientation distribution are still not easy to be described,because the orientation is distributed in the bivariate manner;and it is difficult to be used in the rock engineering.

The normal deformation of is one of the important characters of rock joints.

On the basis of analyzing hyperbola and exponent models in common use, the power function model of shear deformation is presented for rock joints.

Stability analysis of huge underground cavern group in jointed rockmass;

Equivalent model and numerical analysis and laboratory test for jointed rockmasses;

Study on Hydro-mechanical Behaviour of Rock Joints and Computation Method of Bolted Jointed Rockmass;

Scale effect on deformation characteristics of jointed rock mass based on numerical test;

Dynamic cluster analysis of discontinuity orientations of jointed rock mass;

Study on orthotropic equivalent strength parameters of jointed rock mass;

3-D network simulation and probability damage tensor analysis of joint rock mass in open iron mines;

Numerical simulating test on joint rock mass properties in Three Gorges Project;