黄土抗拉强度的综合影响因素探究

对重塑黄土及部分原状黄土进行室内三轴抗剪强度及抗拉强度试验研究，采用Tablecuver3D数据处理软件对试验结果进行三维曲面生成，结果表明：黄土抗拉强度与含水量、干密度和饱和度、孔隙比均呈三维螺旋曲面，且影响抗拉强度的主要因素是含水量和饱和度，次要因素是干密度和孔隙比。与黏聚力和内摩擦角正切值呈凹状微卷上升趋势，黏聚力对抗拉强度有决定性影响而内摩擦角对抗拉强度影响较小。对曲面进行全函数拟合对比分析得出相应抗拉强度相关方程，其中黏聚力和内摩擦角正切值与抗拉强度拟合出的方程具有一般性，可适用于各地黄土，便于工程实践估算黄土抗拉强度。

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.