砂土-钢接触面力学特性的直剪试验研究

RESEARCH ON MECHANICAL PROPERTIES OF SAND AND STEEL INTERFACE BY DIRECT SHEAR TEST

基于常应力状态下的接触面直剪试验,研究土体内部和土与钢接触面的剪切特性。结果表明,土体内部和土-钢接触面特性均可用双曲线模型描述,土体内部和土与钢接触面剪切试验具有明显差异,前者出现略微软化现象,后者出现明显的软化现象,随着法向应力和颗粒粒径的增大,软化特征逐渐减弱,硬化特征逐渐增强。钢-土接触的剪切应力位移曲线可用简化的折线函数进行表述。与钢接触的剪切试验摩擦角明显降低,工程中根据具体情况选取土体与接触面强度参数。

Based on the shear test results of contact surface under constant stress state,the mechanical properties of soil and steel interface are different. The results showed that the two could all be described as hyperbolic model,the soil-steel interface and soil internal shear test had an obvious difference,the former showed a slight softening phenomenon,the latter appeared an obvious softening phenomenon. With the increase of normal stress and particle size,the softening characteristics faded out,the hardening characteristics was gradually enhanced. The shear-stress displacement curve of steel-soil contact could be expressed by simplified folding function. The friction angle of the shear test with steel contact was obviously reduced,and the friction coefficient was around 0. 35. Therefore,it is of practical significance to select soil and contact strength parameters according to the specific engineering situation.