北部湾吹填场地海积软土动力特性试验  

Experiment analysis of dynamic characteristics of marine soft soil in Beibu Gulf

作　　者：李梦幻 吴治兴 周东[1,2] LI Meng-huan;WU Zhi-xing;ZHOU Dong(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;Qinzhou Guijian Engineering Consulting Co.LTD.,Qinzhou 535000,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,南宁530004 [3]钦州桂建工程咨询有限责任公司,广西钦州535000

出　　处：《桂林理工大学学报》2022年第2期403-409,共7页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51378132)。

摘　　要：为探讨不同固结压力、固结比及动荷载频率等条件下夹持厚层软土的动力特性,以广西北部湾吹沙填海场地下伏深厚软土层为研究对象,利用“浸泡-加载”试验装置制备一批不同固结压力和固结比的土样开展GDS动三轴试验,获取海积软土的动应力-动应变曲线、动弹性模量和阻尼比等动力参数的变化规律。结果表明,在同一动应变条件下,动应力、动弹性模量和最大动弹性模量随着固结压力和动荷载频率的增加而增大,随着固结比的增大而减小;阻尼比和最大阻尼比随着固结压力和动荷载频率增加而减小,随着固结比的增加而增大。基于Hardin-Drnevich公式建立了各影响因素变化下海积软土动弹性模量和阻尼比的数学模型,以期为吹沙填海场地卓越周期的演化特征研究提供数据支撑。In order to investigate the dynamic characteristics of thick soft soil under different consolidation pressures,initial deviatoric stress and dynamic load frequency,the soft soil layer under the reclamation site of blowing sand in Beibu Gulf of Guangxi is taken as the research object by“immersion-loading”test device to prepare a batch of soil samples with different consolidation pressures and initial deviator stresses.In dynamic triaxial tests,the dynamic stress and dynamic strain curve,dynamic elastic modulus,damping ratio and other dynamic parameters of marine soft soils can be obtained.When the dynamic strain remains constant,the dynamic stress,dynamic elastic modulus and maximum dynamic elastic modulus will increase with the increase of consolidation pressure and dynamic load frequency,but decrease with the increase of initial deviatoric stress.The damping ratio and the maximum damping ratio decrease with the increase of consolidation pressure and dynamic load frequency,and increase with the increase of initial deviator stress.The mathematical models of dynamic elastic modulus and damping ratio of marine soft soil with various influencing factors are established.The conclusions can provide data support for evolution characteristics study of the remarkable period of sand reclamation sites.

关 键 词：海积软土 动力特性 动弹性模量 阻尼比 

分 类 号：TU435[建筑科学—岩土工程]