动扭剪荷载作用下兰州黄土动力特性试验研究
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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。
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.
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.
引文
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[3]田堪良.黄土的结构性及其动力特性的研究[D].杨凌:西北农林科技大学,2003.
[4]王兰民,袁中夏,王峻,等.强夯处理后黄土地基的动力特性与地震性能[J].岩石力学与工程学报,2003,22(S2):2840-2847.
[5]李作勤.扭转三轴试验综述[J].岩土力学,1994,15(1):80-93.
[6]王兰民.黄土动力学[M].北京:地震出版社,2003:10.
[7]骆亚生,田堪良.非饱和黄土的动剪模量与阻尼比[J].水利学报,2005,36(7):830-834.
[8]孙静,袁晓铭.土的动模量和阻尼比研究述评[J].世界地震工程,2003,19(1):88-95.
[9]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[10]王杰贤.动力地基与基础[M].北京:科学出版社,2001.
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