【摘要】 根据初始含水率W0的不同,把兰州原状黄土分为干型黄土、湿型黄土和饱和黄土。采用动扭剪仪对这3种类型黄土分别进行了研究,主要研究了兰州黄土的动应力应变本构关系、阻尼比变化特性和动强度特性并给出了相应振次N为10,20和30次时的动强度指标值。研究结果表明,3种类型黄土的应力应变曲线呈双曲线型;阻尼比λ与动剪应变对数lg(γd)具有线性相关性;动强度受固结应力的影响各不相同并且动强度指标随振次的增大而减小,但内摩擦角减小的趋势相比黏聚力要小。更多还原

【Abstract】 Lanzhou loess is divided into dry patter,wet patter,and saturated patter according to original water content.The three patterns are studied by using torsion shear apparatus.The constitutive relationship between dynamic stress and strain,the dynamic properties of the damping ration,and the strength of the three patters are studied.The dynamic strength indexes are presented for the cycle time of 10,20,and 30.The study indicates that the curve for stress and strain of the three patterns is a hyperbolic curve;the relationship between damping ration and dynamic strain is linear;and dynamic strength is affected by consolidation stress.At the same time,the dynamic strength indexes change with the cycle time,but change in friction angle is less than that in cohesive strength.更多还原