石灰土填料动力特性试验研究

在大量动三轴试验的基础上,深入研究了石灰土填料的动力特性.试验结果表明:动应变εd是影响土样动弹模量及阻尼比的最主要因素,随着动应变水平的提高,动弹模量Ed成倍减小而阻尼比λ成倍增大.随着掺灰比的增大,石灰土的动弹模量和阻尼比相应增大.动弹模量随围压σ3增减而增减,阻尼比λ随围压σ3的增加而减小.最大动弹模量Edmax与围压σ3呈指数递增关系;最大阻尼比λmax在7%～40%之间,与围压σ3呈指数递减关系,并建立了相应的经验公式.图10,表4,参14.

Experimental study on dynamic properties of soft soil treated with lime under cyclic loading

Based on a lot of dynamic tri-axial tests, dynamic properties of lime soils were thoroughly studied. Among many factors affecting dynamic modulus and damping ratio , dynamic strain was the most important one. Dynamic modulus Ed decreases and damping ratio increases very rapidly with the increase of dynamic strain . Both dynamic modulus and damping ratio increase with the increase of Lime dosage ratio. Dynamic modulus increases while damping ratio decreases as the confining pressure increases at the same strain level. It is found that the maximum dynamic modulus Edmax increases in the relation of exponential function to confining pressure . The maximum damping ratio varies from 7% to 40%; it decreases in the relation of exponential function to confining pressure , and the corresponding formula is put forward. 10figs., 4tabs., 14refs.