Davidenkov模型对海域软土的适用性研究  

Applicability of Davidenkov model for soft soils in sea areas

作　　者：荣棉水[1,2] 李红光[3] 李小军[2] 吕悦军[1] 彭艳菊[1] 修立伟 

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]中国地震局地球物理研究所,北京100081 [3]中国地震应急搜救中心,北京100049

出　　处：《岩土工程学报》2013年第S2期596-600,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51208474);国家重点基础研究发展计划(973项目)(2011CB013601);中央公益性研究所基本科研业务专项资助项目(ZDJ2013-03;ZDJ2011-14)

摘　　要：对渤海海域软土开展了大量应力控制振动三轴试验,在测定土样动剪切模量比与阻尼比的基础上,通过统计分析获得了海域软土动剪切模量比G/Gmax与阻尼比λ随动剪应变γ变化的平均曲线。开展了Davidenkov模型对海域软土的适用性研究,并引入Hardin-Drnevich模型进行对比分析。结果表明,Davidenkov模型比Hardin-Drnevich模型更适用于海域软土,它能更理想地拟合海域软土G/Gmax–γ曲线,但利用Davidenkov模型结合Masing法则得到的理论阻尼比与实测阻尼比仍有一定差别,工程实际中可根据推荐公式估计海域软土阻尼比。Stress-controlled dynamic triaxial tests are conducted for the soft soils in Bohai sea area. Based on the experimental results of dynamic shear modulus ratio and damping ratio, the average curves of dynamic shear modulus ratio G/Gmax and damping ratio λ versus dynamic shear strain are obtained. Applicability research of Davidenkov model for soft soils is carried out, and Hardin-Drnevich model is induced for comparative analysis. The results show that Davidenkov model is more suitable for soft soils in sea areas than Hardin-Drnevich model. It can fit G/Gmax–γ curves of soft soils in sea areas better. The theoretical damping ratio from the combination of Davidenkov model and Masing laws has distinct difference with the measured damping ratio. The damping ratio can be estimated according to the recommended formula in engineering practice for soft soils in sea areas.

关 键 词：海域软土 振动三轴试验 Davidenkov模型 

分 类 号：TU447[建筑科学—岩土工程]