Abstract: The mechanical characteristic of loess is vital for constructions in loess areas.In this paper,mechanical parameters of loess in Lanzhou are tested by different experimentations under natural water content.Based on the data of a large number of loess tests of direct shear indoor and in situ direct shear,the results have some diversity tested by different experimentations.Furthermore,the result tested in situ is great than the tested indoor.Especially the strain of shear damaged,the result of the...