The New Method To Test Soil Damping And The Change Law Of Its Damping Performance

The search to soil damping is used by dynamic triaxial test instrument and resonantcolumn triaxial test apparatus at home and abroad. The test of the traditional soilengineering apparatus is complex, expensive and time-consuming, and its test resultsare discrete. This paper create a new, convenient and fast way to test the value soildamping ratio. The method is that box-soil and empty box damping loss factor is testedby DMA instrument, at the same time its energy are calculated by finite elementsoftware simulation, then the soil damping loss factor is obtained by energy dissipationprinciple, then combined with the relation between damping ratio and damping lossfactor，it gained the result of the soil damping ratio at last. the new test method not onlymore effectively obtain the soil damping ratio, but is able to availably get the law ofinfluence of factor on soil damping. Compared to traditional test apparatus, the new testmethod to get the law of influence is more available. On the basis of this method, thearticle study lots of parameters, such as density, moisture content, temperature,amplitude(strain) and load frequency,etc, to have an affect on the law of soil damping.According to changing one of the influence parameters and fixing the other influenceparameters, it get some valuable results as following:(1) The new test method can effectively test the law affecting the dampingparameters of silty clay and sand, silty clay experimental reproducibility, high moisturecontent of the sand better reproducibility. Relative to traditional geotechnical testing, thelaw of the new method to test the impact of factors to be better than traditionalgeotechnical testing.(2) The five factors of silty clay damping is obtained. the loss factor of silty clayin the box-soil structure is increased with increasing amplitude, increasing water content,increasing density, decreasing vibration frequency, and being little affected ontemperature in the case of non-icing.(3) The six factors of sand damping is obtained. the loss factor of the sand in thebox-soil structure is increased with the increase of amplitude, the increase of watercontent, the decrease of vibration frequency, the increase of density, the increase offullness ratio, and being little affected on temperature under the non-icing condition...