王家全,祝梦柯,唐毅,黄世斌.北部湾地区不同相对密度的海砂力学特性分析[J].海洋工程,2022,40(5):147~157
北部湾地区不同相对密度的海砂力学特性分析
Analysis of mechanical properties of sea sand with different relative densities in the Beibu Gulf
投稿时间:2021-09-12  
DOI:10.16483/j.issn.1005-9865.2022.05.016
中文关键词:  海砂  三轴剪切试验  相对密度  有效围压  北部湾  软化系数  强度特征  体变特征
英文关键词:sea sand  triaxial shear test  relative density  effective confining pressure  Beibu Gulf  softening factor  strength characteristics  volume characteristics
基金项目:国家自然科学基金资助项目(41962017);广西自然科学基金重点项目(2022GXNSFDA035081);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(YCSW2021310);广西大学生创新创业训练计划资助项目(202010594035)
作者单位E-mail
王家全 广西科技大学 土木建筑工程学院, 广西 柳州 545006  
祝梦柯 广西科技大学 土木建筑工程学院, 广西 柳州 545006  
唐毅 广西科技大学 土木建筑工程学院, 广西 柳州 545006 tyi-moon@163.com 
黄世斌 广西科技大学 土木建筑工程学院, 广西 柳州 545006  
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中文摘要:
      为探究相对密度和有效围压对饱和海砂力学特性的影响,利用GDS动态三轴试验仪,对广西北部湾地区海砂开展了一系列固结排水三轴剪切试验,分析了相对密度、有效围压对饱和海砂强度特征、体变特征、割线模量以及摩擦角的影响规律。结果表明:随着围压的减小或相对密度的增大,试样体积应变不断增大,而相对密度或有效围压的增加均会提高试样的峰值强度,有效围压与峰值强度之间呈现良好的线性增长关系。随着围压的减小或相对密度的增大,应力相对软化系数、剪胀系数均不断增大,且有效围压与应力相对软化系数、剪胀系数分别呈线性和半对数线性相关。割线模量随轴向应变的增加整体呈衰减趋势,各试验工况下轴向应变为5%时试样的割线模量相比于轴向应变0.164%衰减了80%~90%。饱和海砂的峰值摩擦角随相对密度的增加而增大,随有效围压的增大而减小,相对密度Dr为50%时有效围压σc为50 kPa对应的峰值摩擦角是σc为200 kPa的1.098倍。
英文摘要:
      In order to explore the influence of relative density and effective confining pressure on the mechanical properties of saturated sea sand, a series of consolidated drainage triaxial shear tests were carried out on sea sand in the Beibu Gulf region of Guangxi using the GDS dynamic triaxial equipment, and the relative density was analyzed. The influence of temperature and effective confining pressure on the strength characteristics, volume deformation characteristics, secant modulus and friction angle of saturated sea sand was also analyzed. The result shows: With the decrease of the confining pressure or the increase of the relative density, the volumetric strain of the specimen will continue to increase, and the increase of the relative density or the effective confining pressure will increase the peak strength of the specimen, which is between the effective confining pressure and the peak strength, showing a good linear growth relationship. With the decrease of confining pressure or the increase of relative density, the relative stress softening coefficient and dilatancy coefficient are increasing, and the effective confining pressure is linearly and semi-log linearly related to the relative stress softening coefficient and dilatancy coefficient, respectively. The secant modulus shows an overall attenuation trend with the increase of the axial strain. When the axial strain is 5% under each test condition, the shear modulus of the specimen is attenuated by 80%~90% compared with the axial strain of 0.164%. The peak friction angle of saturated sea sand increases with the relative density and decreases with the effective confining pressure. When the relative density Dr is 50%, the peak friction angle corresponding to the effective confining pressure σc of 50 kPa is 1.098 times that of σc of 200 kPa.
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