Study On The Stress-strain Behavior Of Saturated Sand By True Triaxial Test

At present, the sand of the stress-strain characteristics difficulty to meet the needs of current engineering practice, the dilatancy is the key factor to describe the sand characteristics. The study of the problem itself is more complex, but also by the limitations of the geotechnical testing means. If there is no true triaxial and true triaxial tests, there are more difficult on the analysis of the dilatancy of sand. Find out the stress-strain relationship of the saturated sand is an effective way to recognize the dilatancy,and true triaxial test is the necessary means.Based on the reliable data of the true triaxial test,This paper focuses on the stress-strain characteristics of the sand to study.The research work done is presented as follows:1. Based on the true triaxial tests of saturated sand under different coefficient of intermediate principal stress, this paper investigates the influence of intermediate principal stress on the stress-strain characteristics of saturated sand. Test results show that, under the same conditions, with the intermediate principal stress coefficient increases, the shear strength of saturated sand is gradually increased.2. Based on the true triaxial test results under different confining pressure conditions, this paper systematically analyzes the stress-strain relationship and the volume change characteristics of saturated sand.3. In confining pressure100kPa or200kPa, the intermediate principal stress coefficient b=0case, based on the test results of the saturated sand under different conditions of the deposition direction, this paper analyzes the impact of stress-induced anisotropy on the sandy soil stress-strain behavior.4. In confining pressure100kPa, the intermediate principal stress coefficient b=0,0.25,0.5,0.75,1case, the paper compares the impact of the drainage status of the mechanical properties of saturated sand.5. According to the experimental results, the Lade-Duncan model parameters were calibrated. And further validate the applicability of the model of saturated sand.Finally, further studies on the research are discussed briefly.