【摘要】 利用单孔法和瞬态瑞利波法分别测试甘肃临夏某黄土场地的剪切波速,结合土体物性参数测试结果,分析黄土剪切波速与测试方法、初始孔隙比、饱和度、天然密度和深度等影响因素之间的发展变化规律,并应用模糊灰关联理论分析上述影响因素对高饱和度黄土剪切波速影响的贡献率。研究表明:单孔法测试的剪切波速小于瞬态瑞利波法测试的剪切波速;随着初始孔隙比增加,剪切波速呈减小趋势,剪切波速增长率则呈增加趋势;随着饱和度、天然密度、深度的增加,剪切波速增长变缓,剪切波速增长率表现为减小趋势。灰色关联分析表明:对剪切波速影响最大的是饱和度,其次为土的深度,天然密度和孔隙比对剪切波速的影响基本相当。更多还原

【Abstract】 The shear wave velocity of loess,in some loess site near Linxia city of Gansu province,was tested through the single-hole method and transient Rayleigh wave method respectively. Together with the laboratorial results of basic properties of loess,the development laws between shear wave velocity and test method,initial void ratio,saturation,natural density and depth were analyzed for high-saturated loess. Based on the fuzzy-gray relation theory,the contribution rates of each influencing factors to the shear wave velocity of loess were studied. It is shown that the value of shear wave velocity is tested less by the single-hole method than the transient Rayleigh wave method;that the value of shear wave velocity is decreasing with the increase of initial void ratio and saturation,but the increasing rate of shear wave velocity become larger. Along with the increase of natural density and depth,the increasing trend of value of shear wave velocity become gentle,but the increasing rate of shear wave velocity has a decreasing trend. It is concluded by relation analysis that the soil saturation has the greatest impact on the shear wave velocity,while depth is the second important factor;and that the influences of soil natural density and void ratio to shear wave velocity are equivalent.更多还原