岩土工程学报2023，Vol.45Issue(z2)：276-283,8.DOI:10.11779/CJGE2023S20044
饱和砂-黏及砂-粉-黏混合土动孔压特性
Dynamic pore water pressure characteristics of saturated sand-clay and sand-silt-clay mixtures
摘要
Abstract
The sand-fines mixtures are widely distributed in hydraulic fill soil and may be subjected to the cyclic action of wave and vehicle loads during their long-term service.It is very important to know the dynamic pore water pressure changing characteristics of the sand-fines mixtures for evaluating the safety and stability of hydraulic fill soil under cyclic loading.The consolidated undrained cyclic triaxial tests are carried out on the saturated reconstituted sand-clay and sand-silt-clay mixtures to investigate the development features of dynamic pore water pressure of mixed soil with different clay contents,fines contents,clay silt ratios and void ratios.By combining with the optical microscope images of soil particles and the theory of soil particles occurrence modes,the influence laws and mechanisms of clay content,fines content,clay silt ratio and void ratio on the dynamic pore water pressure of mixed soils are revealed.It is find that for the sand-clay mixtures(constant e and constant es),with the increasing clay contents,the fluctuation growth trend of dynamic pore water pressure at the later stage of vibration increases and weakens respectively.For the sand-silt-clay mixtures,with the increasing silt contents(decreasing clay contents),the fluctuation growth trend of the dynamic pore water pressure at the later stage of vibration of specimens with FC of 5%changes nonmonotonously.While the fluctuation growth trend of the dynamic pore water pressure at the later stage of vibration of specimens with FC of 10%increases monotonically under different void ratios.The Mod-Baziar model applied to the development of dynamic pore water pressure of sand-clay mixtures and sand-silt-clay mixtures is proposed,which extends the prediction range of dynamic pore water pressure and has higher prediction accuracy.The Mod-Baziar model can better reflect the overall development trend and detail change at the later stage of dynamic pore water pressure.By comparing the values of each parameter in the Mod-Baziar model,it is found that when the Mod-Baziar model is used to predict the dynamic pore water pressure of sand,sand-clay mixtures and sand-silt-clay mixtures with different void ratios respectively,the value range of each parameter in the model increases successively.The preliminary analysis suggests that the above results are attributed to the complex bonding,friction and filling between different particles.关键词
混合土/黏粒含量/细粒含量/黏粉比/动三轴试验/动孔压模型Key words
mixed soil/clay content/fines content/clay silt ratio/dynamic triaxial test/dynamic pore water pressure model分类
建筑与水利引用本文复制引用
李涛,唐小微,曾铃,杨钢..饱和砂-黏及砂-粉-黏混合土动孔压特性[J].岩土工程学报,2023,45(z2):276-283,8.基金项目
国家自然科学基金项目(52308339) （52308339）
海岸和近海工程国家重点实验室开放基金项目(LP2110) （LP2110）
桥梁工程安全控制教育部重点实验室开放基金项目(23ZDXK10) （23ZDXK10）
湖南省教育厅一般项目(22C0143) （22C0143）
