To study the pressure-seepage flow regularity in the veins of coal is very important to dust reduction of coal bed by injecting water.

Therefore, it is put forward herein that high seepage pressure exists locally in the rocks when under jet action, and the magnitude of seepage pressure greatly affects the rock cutting results.

To judge the safety rank of Yunlong Reservoir during the first storing-up period,based on the data monitored from the beginning of the project to the time when the water level reached the normal water level,the seepage pressure,seepage water level,seepage around the dam abutment and seepage discharge of the dam are analyzed in this paper,and seepage lines are also drawn.

Difference resolution to pressure seepage in anomalous region;

Based on the method of adjusting the conductivity matrix, the composite element method is proposed to deal with the elements intersected by free surface in the analysis of unconfined seepage problems.

A FEM program is made to calculate the complicated seepage of the earth dam at BaiShi reservoir and a new finite element algorithm called abandoned element method is developed to solve the problem of free surface of the unconfined seepage.

An unconfined seepage analyzing method for blocky rock mass is proposed by using automatic identification method of three dimensional rock block system to generate its discontinuities network and quoting the initial flow method to solve the variation equation of three dimensional unconfined network seepage problems.