长持时荷载引起黄土滑坡的变形研究

Subjected to long-term process of railway load, the loess slope will appear different degrees of damage, with local soil liquefaction and deformation, even overall instability. Loess dynamic triaxial test are carried out and the dynamic characteristics are studied, it shows that with the increase of cycles, the residual strain develops and so dynamic elastic modulus decreases , the dynamic shear strength decreases. The loess slope dynamic model is established and slope deformation rules are studied. The results show that the process from stability to instability is a non-stable one as displacement increases with time. The lower slopes suffer more and are easier becoming instable. Subjected to vibration load, stability of loess slope decreases significantly, especially when dynamic stress increases and shear strength decreases.