石灰改良土动弹性模量与阻尼比的试验研究

Experimental Study on Dynamic Elastic Modulus and Damping Ratio of Lime-improved Soil

针对施工现场的实际情况,对上海罗北路某新建工程路段的石灰改良软黏土开展动三轴试验,分析研究掺灰量、围压、固结比和加荷频率对其动弹性模量与阻尼比的影响。结果表明:随着掺灰量、围压、固结比和频率的增加,动弹性模量增加,阻尼比减小;动应变对动弹性模量和阻尼比的影响最大,随着动应变的增加,动弹性模量迅速减小,阻尼比成倍增加;随着掺灰量、围压和频率的增加,最大阻尼比减小,最大动弹性模量增加,但是固结比对最大动弹性模量和最大阻尼比的影响比较复杂。

According to the actual situation of construction site, dynamic triaxial test was carried out on the lime-improved soft clay in a newly built section of Luobei Road, Shanghai, through which the effect of lime content, confining pressure, consolidation ratio and loading frequency on the dynamic elastic modulus and damping ratio thereof, was analyzed. The result shows that, as the lime content, confining pressure, consolidation ratio and the frequency increase, the dynamic elastic modulus increases and the damping ratio decreases; the dynamic strain influences the dynamic elastic modulus and damping ratio to a great extent and, as the dynamic strain increases, the dynamic elastic modulus decreases rapidly and the damping ratio multiplies; as the lime content, confining pressure and the frequency increase, the max. damping ratio decreases and the max. dynamic elastic modulus increases, however, the consolidation ratio has complicated impact on the max. damping ratio and the max. dynamic elastic modulus.