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通过GDS共振柱试验,研究不同水泥掺量、养护龄期和围压对水泥土小应变动参量的时间效应。试验结果表明:水泥掺量越大,养护龄期越长,水泥土小应变动剪切模量越高。相同围压下,水泥土小应变动剪切模量越小,水泥土主固结时间越长,固结后小应变归一化剪切模量增长率越大。围压越大,水泥土时间效应越明显,高围压下水泥土小应变动剪切模量显著增大。水泥土在时间效应阶段,其小应变动剪切模量随时间呈近乎线性增长,对于短期内水泥土小应变动剪切模量可以在室内利用共振柱试验测得水泥土归一化剪切模量增长率后进行修正。
The GDS resonance column test was used to study the time effect of different cement content, curing age and confining pressure on the small parameters of soil and cement. The test results show that the greater the cement content, the longer the curing age, the higher the shear modulus of cement soil under small strain. Under the same confining pressure, the smaller the small shear deformation modulus of cement soil, the longer the consolidation time of cement and soil, the larger the normalized shear modulus growth rate of consolidation. The larger the confining pressure is, the more obvious the time effect of cement soil is. The small shear deformation modulus of cement soil under high confining pressure is increased significantly. In the time-dependent stage of cement-soil, the small-strain dynamic shear modulus increases nearly linearly with time. For the small-shear dynamic shear modulus of cement-soil in the short-term, the normalized shear of cement soil can be measured indoors using the resonance column test Modulus growth rate after correction.