Title:
THE EFFECT OF MIDDLE PRINCIPAL STRESS ON SANDY SOIL STRENGTH

Authors:
Yujie Sun, YongLai Zheng

Abstract:
According to Mohr-Coulomb failure criterion, the strength of soil specimen is mainly related with the maximal principal stress and the minimal principal stress, which fails to reflect the effect of the middle principle stress. However, more and more triaxial experiments show that the middle principle stress has a certain impact on soil strength. Generally speaking, when the middle principal stress increases, the soil strength tends to increase uniformly at beginning and then decrease later. The effect of the middle primary stress is widely applied in many soil engineering issues such as Excavation, Curve Slope Stability, Failure of The Rock Structure and so on. Therefore, it's not only of important theoretical significance but also of vast value in engineering to study the effect of the middle principle stress on sandy oil strength. The particle flow code, PFC3D, is used to simulate a true triaxial test in order to study and analyze the effect of the middle principle stress on sandy soil strength.