Based on the bigger fluctuation of raw coal quality in Zhongmacun Coal Preparation Plant,the technological reforms such as removal of slime from fine coal below 13 mm,three-product dense medium cyclone by pressurized feeding were taken and good separation effect was obtained.

A pressurized pressure-restoring system was designed for large-scale vacuum chambers with a view of analyzing the pressure-restoring process with high speed requirement.

The problem of the alternative free-pressure flow of a new discharge tunnel in Nanshui reservoir is studied in this paper.

On the basis of the model test results, the paper presents the primary analysis on starting law of silt in the pressure flow state and proposes the empirical formulas used for non silting condition in underground culvert.

Simulation based finite element analysis on the pressure tunnel of complex geogical condition;

Monte Carlo method for simulating flow in outlet structure of pressure tunnel;

the Tianhuangping power station, the Guangxu power station, and the Shahe power station, the method currently used for determination of the rock mass thickness between pressure tunnels at home was introduced.

Difference resolution to pressure seepage in anomalous region;