At first,for the complicated rock masses containing many discontinuities,the mesh of the whole domain without any discontinuity and the mesh for each discontinuity,together with its adjacent zone,are generated separately.

The most remarkable feature of the algorithm is that each composite element may contain several discontinuity segments,such as faults and joints.

Based on mesoscopic damage mechanics,a numerical code RFPA2D is developed to simulate the failure process of rock tunnel with discontinuity under dynamic disturbance,and the failure behaviors of rock tunnel with different width of discontinuities during stress wave propagation are discussed.

Analysis of three probability models between trace length and diameter of rock discontinuities;

Various interface elements are successfully applied in traditional finite element method(FEM) to model discontinuities,in which Goodman element is the most representative one.

Analysis of influence of discontinuous plane on strength of rock mass based on unified strength theory;

There are a lot of discontinuous planes in rock mass of Longtan hydropower station underground power-house,so it is of practical value to make certain whether there are unstable blocks on excavation planes where faults and joints interlace with each other.

For the research on shear deformation characteristics of the discontinuous plane, the hyperbolic function is adopted to describe the shear deformation curve, and the key factors are discussed.

The author,based on the actual production,presents a new method for power calculation for milling discontinuous plane.

And the applications of this method in all aspects,such as excavation,non-continuous faces and rock bolt,as well as the calculated program block diagram are related briefly.