饱和钙质砂孔压发展特性试验研究  

Study on pore pressure development characteristics of saturated calcareous sand

作　　者：杨斌[1] 林军 YANG Bin;LIN Jun(School of Architecture Engineering,Jiangsu Open University,Nanjing 210036,China)

机构地区：[1]江苏开放大学建筑工程学院,江苏南京210036

出　　处：《人民长江》2022年第6期174-179,共6页Yangtze River

基　　金：国家自然科学基金项目(51908250)。

摘　　要：在岛礁建设中,钙质砂场地会受海浪等周期性荷载影响,因此有必要开展循环荷载下钙质砂的动力响应研究。采用动三轴试验探究了循环荷载作用下,在不同的固结围压、相对密实度和循环应力比条件下饱和钙质砂的孔隙水压力发展规律;将张建民孔压模型用于各工况归一化孔压发展模式的分析,并给出各条件下的推荐孔压模型。研究结果表明:张建民模型C型适用于描述循环应力水平较大时的孔压发展模式,而固结围压、相对密实度较高且处于中等应力水平时可采用修正的张建民模型A型,其余情况均可用B型拟合。此外,各模型的拟合参数与相对密实度和固结围压均有较好的相关性。In construction of reefs and islands, the grounds of calcareous sand are influenced by cyclic loads such as sea wave, so it is necessary to study the dynamic response of calcareous sand under cyclic load.We carried out cyclic triaxial tests to study the pore water pressure development of calcareous sand under different consolidation confining pressures, relative densities and cyclic stress ratios.The ZHANG Jianmin’s pore pressure model was used to analyze the normalized pore pressure development mode of each working condition, and the recommended pore pressure model under each condition was given.The results showed that ZHANG Jianmin C type model was suitable for describing the development mode of pore pressure when the cyclic stress level was large, and modified ZHANG Jianmin A type model could describe soils that were in high consolidated confining pressure and high relative density while a medium stress level, and the other cases could be fitted by type B.The fitting parameters of each model have good correlation with relative density and consolidation confining pressure.

关 键 词：饱和钙质砂 孔压发展特性 动三轴试验 张建民孔压发展模型 

分 类 号：TU41[建筑科学—岩土工程]