Field Tests on Shear Strength Parameters About Gobi Gavel Soil

Field direct shearing tests on Gobi gavel soil were carried out in Xinjiang and Gansu. The shear strength parameters of the Gobi gravel soil were analyzed based on the experimental results. It indicated that the progressive failure mechanism of the Gobi gravel soil could be described as “elastic deformation-elastic-plastic deformation to peak strength-strength demineralization to residual strength”. The Gobi gravel soil had a good performance on the shear bearing capacity. The mean, standard deviation and variability coefficient of the internal friction angle of Gobi gravel soil were 40.6-43.6°, 3.4-10.3°and 0.003-0.253. And the values for cohesive strength of the soil were 10.5-23.0kPa,1.2-7.3kPa, 0.12-0.32 respectively. Moreover, with the increase of average value, the standard deviation and variation coefficient had a increasing tendency.