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  2019,Vol.14no.4 ,page:742-749

Experimental Study on the Influence of Consolidation Time on Dynamic Characteristics of Soft Soil
Abstract:      The consolidation test is an important step of dynamic characteristic test for soft soil, and the consolidation time is an important factor affecting the dynamic characteristic parameters of soft soil. To address the uncertainty of the consolidation time in triaxial test for engineering and scientific research work, the parallel triaxial tests of soft soil will be carried out in this paper, by using the 8 hours, 12 hours, 24 hours and 24 hours to finish the consolidation test. The influence of consolidation time on dynamic characteristics of soft clay is analyzed through the test results of characteristic parameters, such as Gmax, λmax, G/Gmax-γ curve, λ-γ curve. The results show that dynamic characteristics parameters of soft soil are significantly affected by consolidation time. The values of G/Gmax-γ decrease with the increase in consolidation time. The damping ration test results show that there is a clear boundary point for dynamic shear strain. Below the boundary point, the damping obtained at the mid-to-long term consolidation time is relatively large, while above the point, the damping obtained at the short-term consolidation time relatively large.
Author NameAffiliation
Lan Jingyan Beijing University of Technology, Beijing 100022, China
Guilin University of Technology, Guilin 541004, Guangxi, China 
Wang Yanwei Beijing University of Technology, Beijing 100022, China
Guilin University of Technology, Guilin 541004, Guangxi, China 
Cao Zhenzhong Guilin University of Technology, Guilin 541004, Guangxi, China 
Liu Juan Guilin University of Technology, Guilin 541004, Guangxi, China
Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China 
Keywords:    Coastal soft soil  Consolidation time  Dynamic shear modulus  Damping ratio
Received on:  May 28, 2019
固结时间对软土动力特性影响的试验研究
摘要:    固结试验是研究软土动力特性的重要环节,固结时间是影响软土动力特征参数的重要因素。围绕岩土工程及科研工作中对动三轴试验中固结时间影响规律的认识较为模糊的问题,拟对天津滨海软土开展动三轴平行试验,分别采用8h、12h、24h、48h进行固结,针对软土的最大动剪切模量Gmax、最大阻尼比λmax及动剪切模量比Gd/Gmax和阻尼比λ随动剪切应变γd的变化规律,分析固结时间对软土动力特性参数的影响。试验结果表明:GmaxλmaxGd/Gmax-γd曲线、λ-γd曲线受固结时间的影响较为显著。Gd/Gmax-γd曲线随着固结时间的增加而减小。阻尼比试验结果表明动剪切应变存在明显的分界点,分界点以下,中长期固结时间所得阻尼比较大,而分界点以上,短期固结时间所得阻尼比较大。
关  键  词:滨海软土  固结时间  动剪切模量比  阻尼比
基金项目:国家自然科学基金(51408559);广西自然科学基金(2018GXNSFAA281183);桂林理工大学博士启动基金(GLUTQD2016025)
作者简介:兰景岩,男,生于1981年。博士,副研究员。主要从事岩土工程与地震工程的教学与科研工作。E-mail:lanjy1999@163.com
引用本文格式:兰景岩,王延伟,曹振中,刘娟.固结时间对软土动力特性影响的试验研究[J].震灾防御技术英文版,2019,14(4):742-749  DOI:10.11899/zzfy20190405
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