Based on the occurrence mechanism of settlement of earth rock dam,a statistic settlement model with high precision is proposed. Analyzing and studying the influences of various factors on stress and deflection about slab of concrete faced dam, the statistic models of stress and deflection for slab of concrete faced dam are developed.

The paper explains the application of optimum approximation in the project taking the earth rock dam settlement, discusses the selection of earth-rock dam settlement model according to the characteristics of earth-rock dam settlement, the fit question is resolved with the genetic algorithm. The result indicates that that the model of earth-rock dam settlement established with the optimum approximation is effective.

In order to understand the characteristics and mechanism of flow washout for the crevice of core wall in earth rock dam,according to the exemple of crack washout test for the core of Heihe Dam,constant water level washout test and changing water level washout test are adopted differently,the process of test and the character of the flow washout for the core crack are gone into particulars.

The problem of strength,liquefaction and failure of saturated sands has always been greatly concerned in dealing with the safety of foundations of hydraulic structures and earth or earth-rock dams against earthquake action.This paper gives out some criteria and methods for their evaluation. The theory of limit equilibrium has been used as a criterion to evaluate the incipient failure condition of the saturated sands under cyclic loading and the corresponding laboratory tests and analytical...

The problem of strength,liquefaction and failure of saturated sands has always been greatly concerned in dealing with the safety of foundations of hydraulic structures and earth or earth-rock dams against earthquake action.This paper gives out some criteria and methods for their evaluation. The theory of limit equilibrium has been used as a criterion to evaluate the incipient failure condition of the saturated sands under cyclic loading and the corresponding laboratory tests and analytical methods are suggested.The distinction between liquefaction and incipient failure has been clarified.Furthermore,a preliminary scheme of open-type effective stress dynamic analysis method is proposed.Finally,the subjects for further investigation are remarked and the importance of preventive measures to avoid liquefaction and failure of saturated sands is emphasized.

The problem of strength, liquefaction and failure of saturated sands has always been greatly concerned in dealing with the safety of foundations of hydraulic structures and earth or earth-rock dams against earthquake action. The theory of limit equilibrium is adopted as a criterion in evaluation of the incipient failure state of saturated sands under cyclic loading, and the corresponding laboratory tests and analytical methods are suggested. The difference between liquefaction and incipient...

The problem of strength, liquefaction and failure of saturated sands has always been greatly concerned in dealing with the safety of foundations of hydraulic structures and earth or earth-rock dams against earthquake action. The theory of limit equilibrium is adopted as a criterion in evaluation of the incipient failure state of saturated sands under cyclic loading, and the corresponding laboratory tests and analytical methods are suggested. The difference between liquefaction and incipient failure is clarified. Two types of approach are proposed for evaluation of pore water pressure changes induced by cyclic loading, in one of which their dispersion and dissipation behaviour is taken into account.

For the purpose of exposing the influences of stress path on the stress-strain behaviors of earth fill, a lot of experiments were performed in the triaxial shear apparatus by using a variety of stress paths on various specimens of different soil types, involving cohesionless, also cohesive.According to the practical variation of stress distribution in the earth-rock dams, the laws of the stress-strain relationships under the condition of constant stress ratio (σ1/σ3=const.) stress path...

For the purpose of exposing the influences of stress path on the stress-strain behaviors of earth fill, a lot of experiments were performed in the triaxial shear apparatus by using a variety of stress paths on various specimens of different soil types, involving cohesionless, also cohesive.According to the practical variation of stress distribution in the earth-rock dams, the laws of the stress-strain relationships under the condition of constant stress ratio (σ1/σ3=const.) stress path were emphatically discussed.An exponential model, which better reflects the results obtained from the experiments under the condition of constant stress-ratio path, was suggested.The application of this model to calculate the stress and displacement distributions in an earth dam during construction period comes to the conclusion that the stress path exerts an important influence on the displacement distribution in earth dam, rather than the stress distribution.In this paper, a comparative work was presented, taking stress path in consideration or leaving it out in the finite element method calculation of earth dams (i.e. comparison of exponential model with Duncan-Chang model).