Some problems existing in practical application of tetrahedron concrete in river closure construction are analyzed through the comparison of its effect with that of oversize rock in stability of erosion control and convenience in construction.

The river closure design of Jinhe Hydropower Station is described, comprising;(1) arrangement of construction;(2) material sources for river closure; (3) river closure design;(4) river closure construction;(5) river closure measures; etc.

The site river closure construction must be organized carefully,properly and scientifically.

Risk estimation of river closure based on the Monte_Carlo method;

To solve the problems existed in construction diversion and closure system simulation at present such as hard modeling of simulation computation, poor transplantablity of program, separation between computation and data results, and difficult realization of simulation visualization, structural drawing-oriented simulation theory and method is presented in this thesis.

By adopting FEM software with Drucker-Prager yield criteria and based on one shallow tunnel crossing the piled foundation of a building, research on the deformation and mechanical features of structures because of cutting piles during construction was carried out.

Four methods with different Intercepting Facilities are proposed and the influence of these methods on city inland rivers and sewage system is analyzed.