岩土工程学报2024，Vol.46Issue(1)：63-71,9.DOI:10.11779/CJGE20221161
南海岛礁珊瑚砂砾混合料动力特性试验研究
Experimental study on dynamic characteristics of calcareous sand-gravel mixtures from islands in the South China Sea
摘要
Abstract
In the construction process of reef islands in the South China Sea,the upper reclamation foundation materials exist in the form of a combination of large calcareous gravels and small calcareous sand mixed in random proportions.Such composition state makes the foundation exhibit complex mechanical properties under dynamic loads such as earthquakes.A series of undrained cyclic triaxial tests under different conditions of gravel content,relative density,confining pressure and initial shear stress are carried out to study the dynamic response of calcareous sand-gravel mixtures.The test results show that the mixtures display a lower axial strain growth and pore pressure rise rate than the pure calcareous sand under cyclic loading,regardless of loose and dense states.It indicates that the calcareous sand-gravel mixtures exhibit higher liquefaction resistance than the calcareous sands.The liquefaction resistance of the calcareous sand-gravel mixtures increases significantly with the gravel content,relative density and initial shear stress.In dense state,the liquefaction resistance of mixtures decreases with increasing confining pressure,but not for the loose samples,which probably relates to the coupled effects of the confining pressure and density.The effects of the gravel content on the liquefaction resistance of the calcareous sand-gravel mixtures are controlled by the grain skeleton structure.The grain-scale structure is dominated by coarse particles(calcareous gravel)or small particles(calcareous sand).The binary media characterization is an important factor for the study on mechanical properties for the calcareous sand-gravel mixtures.关键词
珊瑚砂砾混合料/动力特性/含砾量/骨架结构Key words
calcareous sand-gravel mixture/dynamic characteristic/gravel content/skeleton structure分类
建筑与水利引用本文复制引用
吴杨,吴毅航,马林建,崔杰,刘建坤,戴北冰..南海岛礁珊瑚砂砾混合料动力特性试验研究[J].岩土工程学报,2024,46(1):63-71,9.基金项目
国家自然科学基金项目(5222809,52178322,51908153) （5222809,52178322,51908153）
广东省基础与应用基础研究基金项目(2021A1515012096,2021A 1515110201) （2021A1515012096,2021A 1515110201）
广州市科技计划项目(202102010380,2022010202024) （202102010380,2022010202024）
