滨海淤泥固化土的动模量与阻尼比特性研究  

Experimental Study on Dynamic Shear Modulus and Damping Ratio of Solidified Soil in Marine Silt

作　　者：王桂萱[1] 张虎韦 赵杰[1] WANG Guixuan;ZHANG Huwei;ZHAO Jie(Civil Engineering Technology Research and Development Center,Dalian University,Dalian,Liaoning 116622,China)

机构地区：[1]大连大学土木工程技术研究与开发中心,辽宁大连116622

出　　处：《水利与建筑工程学报》2020年第1期51-55,共5页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金面上项目(51678100);辽宁省自然科学基金指导计划(20170540043)。

摘　　要：采用海洋淤泥与固化剂混合形成的固化土对地基工程进行处理,相比于回填土、开山石作为地基材料要更加经济,淤泥固化土可广泛用于道路、堤防、填海造地等工程领域。通过对大连金州湾海域海洋淤泥土进行不同掺入比(8%、10%、12%)的固化处理,采用动三轴试验对不同(掺入比、围压)条件下的固化土进行动力特性试验。结果表明:当固结应力与动剪应变值不变时,固化土的动剪模量随着掺入比的增大而增大,阻尼比减小;当动剪应变小于临界值10-3时,动剪模量减小的速率较小,阻尼比增长曲线缓慢,当动剪应变大于10-3时,模量值衰减速率增大,而阻尼比增长变快;当固化剂的掺入比大于10%时,固结应力的增大对固化土动模量的影响稍有减弱。The solidified soil formed by mixing marine sludge and solidifying agent is often used to treat the foundation engineering. It is more economical than the backfill and open rock as the foundation material. The solidified soil can be widely used in roads, dikes, reclamation and other engineering fields. Through the different treatment ratios(8%, 10%, 12%) of the marine silt in the Jinzhou Bay of Dalian, the dynamic triaxial test is used under different conditions(incorporation ratio, age, confining pressure). The solidified soil was tested for dynamic properties. The results show that when the consolidation stress and dynamic shear strain are constant, the dynamic shear modulus of solidified soil increases with the increase of the mixing ratio, but the damping ratio will decrease. When the dynamic shear strain is less than the critical value 10-3, the rate of reduction of the dynamic shear modulus is small, and the damping ratio growth curve is slow. When the dynamic shear strain is greater than 10-3, the decay rate of the modulus value increases, while the damping ratio increases faster;When the curing agent is mixed the ratio is greater than 10%, the influence of the increase of the consolidation stress on the dynamic modulus of the solidified soil is slightly weakened.

关 键 词：海洋淤泥 固化土 动三轴 动剪模量 阻尼比 

分 类 号：TU411[建筑科学—岩土工程]