EXPLORE THE COMBINED INFLUENCE FACTORS OF THE LOESS TENSILE STRENGTH

The shear and tensile properties of remolded loess and partially intact loess were investigated by using laboratory triaxial shear test and unconfined penetration tensile test, and the test results for three-dimensional surface fitting by Tablecuver 3D. The results indicated that tensile strength with water content and dry density showed a three-dimensional spiral surface, and similar with saturation, void ratio. The main factors affecting the tensile strength are water content and saturation, and the secondary factor are dry density and void ratio. Tensile strength with cohesion and internal friction angle show tangent concave slightly curled upward trend. Cohesion has a decisive influence on the tensile strength but the internal friction angle has little effect. The relation equation of tensile strength with cohesion and angle of internal friction tangent has general applicability after surface fitting discovery, and it's ease to estimate the tensile strength of loess in engineering practice.