EXPERIMENTAL RESEARCH ON LOESS DYNAMIC CHARACTERISTICS AT GROUND FISSURE BELT IN XIAN AREA

The Weihe Basin can be one of the most developed areas associated with ground fissures and geo-hazards in China and even in the world. This paper considers the ground fissure disasters on the influence of site condition, especially to the site soil of the dynamic characteristics and dynamic response. Under the condition of constant pressure consolidation, the consolidated undrained dynamic triaxial tests are carried out on the loess at the Xi'an area ground fissures belt with different confining pressures. The tests result in dynamical parameters. Based on the experimental results, the change laws of dynamic shear modulus with strain relationship and damping ratio with strain relationship are analyzed. And the equivalent visco-elastic constitutive model is established, which lays the foundation for the further analysis of dynamic response of soil field.