琼州海峡100 m以浅海洋土动剪切模量比和阻尼比试验研究

孙田; 陈国兴; 周恩全; 李小军

琼州海峡100 m以浅海洋土动剪切模量比和阻尼比试验研究 English Version

孙田^{1, 2},
陈国兴^1,2,,
周恩全^{1, 2},
李小军^{1, 3}

1. 南京工业大学岩土工程研究所,江苏南京 210009; 2. 江苏省土木工程防震技术研究中心,江苏南京 210009; 3. 中国地震局地球物理研究所,北京 100081

基金项目: 国家重点基础研究发展计划（973计划）（2011CB013601）

详细信息

作者简介:
孙田(1984- )，男，湖北天门人，博士研究生，主要从事土动力学方面研究工作。E-mail: tian846846@163.com。

中图分类号: TU411.8
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出版历程
- 收稿日期: 2013-06-06
- 发布日期: 2013-11-24

Experimental study on dynamic shear modulus ratio and damping ratio of marine soils in Qiongzhou Strait with depth less than 100 m

SUN Tian^{1, 2},
CHEN Guo-xing^1,2,,
ZHOU En-quan^{1, 2},
LI Xiao-jun^{1, 3}

1. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China; 2. Civil Engineering & Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing 210009, China; 3. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

摘要

摘要: 对琼州海峡海床埋深100 m以浅的70个原状海洋土样进行动三轴试验和自振柱试验研究,研究了剪应变幅值在1×10^-6～3×10^-2范围内海洋土的动剪切模量比和阻尼比的变化规律,相互验证了两种试验方法测试结果的可靠性,结果表明,两种试验方法的测试结果具有一致性。不考虑塑性指数的影响时,海洋粉质黏土、粉质黏土夹砂和黏土夹砂的最大动剪切模量与有效围压成线性关系；剪应变幅值在1×10^-6～3×10^-5范围内,海洋土阻尼比近似为常数。根据试验结果提出了阻尼比增长模型,并采用该模型与Martin和Seed提出的动剪切模量衰减模型给出了海洋土动剪切模量比和阻尼比随剪应变变化的平均曲线及其参数的推荐值。研究结果有利于加深对琼州海峡海洋土动力特性的认识。
- 琼州海峡 /
- 海洋土 /
- 动剪切模量比 /
- 阻尼比
Abstract: Cyclic triaxial and free vibration column tests on dynamic shear modulus ratio and damping ratio of 70 undisturbed samples of marine soils in Qiongzhou Strait seabed with depth less than100 m are conducted. The reliability of the two tests is mutually verified by investigating the variation rules of the dynamic shear modulus ratio and the damping ratio under the dynamic shear strain ranging from 1×10^-6 to 3×10^-2. It is found that the two test results agree well with each other. Without considering the influence of plasticity index, the maximum dynamic shear modulus has a linear relationship with the effective confining pressure for sand-contained clay, silty clay and sand-contained silty clay. The damping ratio of the marine soils is approximately constant under the dynamic shear strain ranging from 1×10^-6 to 3×10^-5. According to the test results, a damping ratio growth model is proposed. The fitting curves of the dynamic shear modulus ratio and damping ratio changing with the shear strain as well as the recommended parameters in the empirical formula are predicted using the proposed model and the empirical modulus attenuation model proposed by Seed and Martin. The results of this study may be used to make a preliminary estimate of the dynamic properties of marine soils in Qiongzhou Strait and to confirm field and laboratory tests on such soils.
- Qiongzhou Strait /
- marine soil /
- dynamic shear modulus /
- damping ratio

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