STUDY ON TRIAXIAL TEST OF SHEAR STRENGTH OF LOESS IN SOUTHERN JINGYANG COUNTY

The 9th floor loess(L9)in Southern Jingyang County is the main object of the study. Triaxial tests are carried out in order to evaluate the shear strength properties of the loess through varying the confining pressure and water content. We get the relationship between water content and slope stability through analyzing the slope stability with different water content. The following conclusions can be reached: ①The decrease of shear strength of L9 loess is mainly controlled by the decrease of cohesion when water content is 5.3% to 12.3%. ②Both cohesion and internal friction angle have a great impact on the decrease of shear strength of L9 loess when water content is 12.3% to 19.3%. ③The decrease of shear strength of L9 loess is mainly controlled by the decrease of internal friction angle when water content is 19.3% to 25%. ④The amount of water content of L9 loess has a direct impact on the stability of the slope for the slope stability factor declines with water content increases. The results can be used in loess slope engineering management,monitoring,especially early prediction of slope safety in southern Jingyang county.