安全与环境工程2024，Vol.31Issue(4)：20-28,9.DOI:10.13578/j.cnki.issn.1671-1556.20221285
相对密实度和固结应力比对北部湾海砂动力特性影响的试验研究
Experimental study on the influence of relative density and consolidation stress ratio on the dynamic characteristics of sea sand in Beibu Gulf
摘要
Abstract
There are abundant marine resources in Beibu Gulf area,and the development of marine engineer-ing in this area is becoming increasingly important.To understand the dynamic characteristics of sea sand under different consolidation stress ratio and density conditions is very important for coastline protection,port construction and dike engineering.In order to explore the dynamic characteristics of Beibu Gulf sea sand,a series of consolidation undrained cyclic dynamic triaxial tests were carried out on Beibu Gulf sea sand,and the effects of relative compacting degree and consolidation stress ratio on the axial cumulative strain,dynamic elastic modulus,dynamic pore pressure and hysteresis curve of Beibu Gulf sea sand were analyzed.The results show that the axial cumulative strain of sea sand decreases with the increase of con-solidation stress ratio and relative density at the same vibration level.The dynamic pore pressure decreases linearly with the increase of consolidation stress ratio.At low relative density(Dr≤50％),the dynamic pore pressure increases with the increase of vibration times.At high relative density(Dr=70％),the dy-namic pore pressure increases first and then decreases with the increase of vibration times.The dynamic e-lastic modulus appears stiffness softening phenomenon with the increase of vibration times,and the relative density and consolidation stress ratio are increased,which obviously slows down the attenuation rate of dy-namic elastic modulus.With the increase of consolidation stress ratio and relative density,the area enclosed by the hysteresis curve decreases,and the hysteresis curve changes from an unclosed curve to a closed curve.These research results can provide some reference for the reclamation project in Beibu Gulf.关键词
北部湾海砂/相对密实度/固结应力比/滞回曲线/动三轴试验Key words
sea sand in Beibu Gulf/relative density/consolidation stress ratio/hysteresis curve/dynamic tri-axial test分类
资源环境引用本文复制引用
王家全,和玉,祝梦柯,钱弘毅..相对密实度和固结应力比对北部湾海砂动力特性影响的试验研究[J].安全与环境工程,2024,31(4):20-28,9.基金项目
国家自然科学基金项目(41962017) （41962017）
广西自然科学基金重点项目(2022GXNSFDA035081) （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) （桂教人才[2020]6号）
广西科技大学研究生教育创新计划项目(GKYC202328) （GKYC202328）
广西大学生创新创业训练计划资助项目(202210594057) （202210594057）
