The Model Experiment And Numerical Simulation Study Of The Permeability In Dangerous Earth-rock Dam

This paper combines the National Natural Science Foundation Project: dam leakage of electricity on an integrated imaging technology research (50779081), model test and numerical simulation methods, the penetration of the dam to study law and leakage mechanism, so as to debris dam of reinforced and diagnosis theory.The main work of this paper is as follows:(1) Through collecting a large number of domestic and foreign literature, to understand dam the dangerous situation at home and abroad, summarized. The reasons for dam failure and dam seepage disease type, disease type according to one of the most important diseases of generalized theoretical model of the dam.(2) Aims in the earth-rock dam leakage destruction form, the hypothesis earth-rock dam establishment in the water-proof ground, the build dams material for each item of homogeneous body, establishes the physical model, according to experimental obtained result analysis sickness danger earth-rock dam seepage rule.(3) Take advantage of the theoretical model of disease earth-rock dam, assumed that the seepage obeys the Darcy's law, assumed that not consider soil and water compression, Soil pore size and porosity not change when infiltration, assumed that soil water saturation of the body unchanged. On the basis of this hypothesis, set up two kinds of two-dimensional model of earth-rock permeability.(4) Using of the finite element analysis software FLAC3D,on the analysis of stress and pore pressure of the two disease models, Summing up the law of earth-rock permeability and the mechanism of earth-rock dam seepage. No matter what kind of earth-rock dam seepage damage, infiltration of soil damage from a weak start of the flow of exports, Soil particles to flow away, Then continue to the upper reaches, Finally the formation of seepage on the downstream channel connectivity.(4)This thesis provides a theoretical basis of the reinforcement for the earth-rock- fill dam, and on the basis of reinforcement of existing technologies in earth-rock dam, makes recommendations to the existing earth-rock dam reinforcement technology.