摘要
为研究北部湾地区海砂填料的动力特性,采用高级动态三轴测试系统开展循环荷载下的动三轴试验,研究不同围压及不同动应力幅值对海砂动力特性的影响规律。试验结果表明:轴向累计应变随围压增加而减小,围压150 kPa时振次10000后应变仅为3%;随着动应力幅值的增大轴向累积应变随之增大,且达到破坏标准的时间越短。动弹性模量随着动应力幅值和围压的增加而增大,不同围压下动弹性模量随动应变的增加出现先骤减再略减后稳定的发展趋势,εd>0.3%后开始趋于稳定;不同动应力幅值下动弹性模量出现先增后减直至稳定的趋势,其中动应力幅值对动弹性模量有明显的影响,围压影响相对较小。孔压比随动应力幅值增加而减小,随围压增加而增加。
To study the dynamic characteristics of sea sand filler in the Beibu Gulf,the advanced dynamic triaxial test system was used to carry out the dynamic triaxial test under cyclic loading to study the influence of different confining pressures and different dynamic stress amplitudes on the dynamic characteristics of sea sand.The test results show that the axial cumulative strain decreases with the increase of confining pressure,and the strain after 10,000 vibrations at 150 kPa is only 3%;as the dynamic stress amplitude increases,the axial cumulative strain increases and the time to reach the failure criterion decreases.The dynamic elastic modulus increases with the increase of dynamic stress amplitude and confining pressure.Under different confining pressures,with the increase of dynamic strain,the dynamic elastic modulus decreases sharply with the increase of dynamic strain,and then decreases slightly and finally stabilizes,andεd>0.3%begins to stabilize;under different dynamic stress amplitudes,the dynamic elastic modulus first increases and then decreases until it stabilizes.The dynamic stress amplitude has a significant influence on the dynamic elastic modulus,and the confining pressure has a relatively small effect.The pore pressure ratio decreases with the increase of dynamic stress amplitude and increases with the increase of confining pressure.
作者
王家全
陈胜前
唐毅
黄世斌
黄钦政
WANG Jiaquan;CHEN Shengqian;TANG Yi;HUANG Shibin;HUANG Qinzheng(College of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)
出处
《海洋工程》
CSCD
北大核心
2020年第5期149-155,共7页
The Ocean Engineering
基金
国家自然科学基金项目(41962017)
广西自然科学基金项目(2017GXNSFAA198170)
广西高等学校高水平创新团队及卓越学者计划项目(桂教人才〔2020〕6号)
广西研究生教育创新计划项目(YCSW2020222)
广西大学生创新创业训练计划资助项目(201910594190)。
关键词
海砂
动三轴试验
累计应变
动模量
动孔压
sea sand
dynamic triaxial test
cumulative strain
dynamic modulus
dynamic pore pressure
