南水北调中线工程段弱膨胀土的动力学性质研究  

Dynamic Characteristics Research on Weak Expansive Soil of the Middle Route Project of South-to-North Water Transfer

作　　者：湛川[1,2] 李刚[3] 刘莹莹[1] 

机构地区：[1]华北水利水电学院,河南郑州450045 [2]华北电力设计院工程有限公司,北京100032 [3]中国水电顾问集团昆明勘测设计研究院,云南昆明650041

出　　处：《华北水利水电学院学报》2013年第3期70-73,共4页North China Institute of Water Conservancy and Hydroelectric Power

基　　金：国家自然科学基金资助项目(41140030);郑州市创新型科技人才培育计划领军人才项目(10LJRC185)

摘　　要：膨胀土在我国分布广泛,掌握膨胀土的动力学特性有重要的理论和工程意义.以南水北调中线工程禹州段弱膨胀土为研究对象,通过循环动单剪试验,研究固结压力和振动频率分别对弱膨胀土的动剪切模量和阻尼比的影响.试验结果表明:随着固结压力的增大,动剪切模量和阻尼比都增大;随着振动频率的增大,动剪切模量增大;对同一剪应变,频率愈低,阻尼比愈小,频率愈高,阻尼比愈大;随着剪应变的增加,试件的阻尼比逐渐增大.Expansive soils are widely distributed in China, so it has important theoretical significance and engineering significance to grasp the dynamic characteristics of expansive soils. Based on the weak expansive soil of Yuzhou section in the Middle Route Project of South-to-North Water Transfer, the effect of consolidation pressure and vibration frequency respectively on dynamic shear modulus and damping ratio is mainly discussed by the cyclic simple shear test. The test results show that the dynamic shear modulus and the damp- ing ratio both increase with the increase of consolidation pressure and the dynamic shear modulus increases with the increase of vibration frequency. The results also indicate that on the same shear strain, the lower vibration frequency is, the smaller the damping ratio, as well as the higher vibration frequency is, the larger the damping ratio, and the damping ratio of the specimens gradually increases with the increase of the shear strain.

关 键 词：膨胀土 振动频率 固结压力 动剪切模量 阻尼比 

分 类 号：TU411.3[建筑科学—岩土工程]