南海钙质砂的动剪切模量与阻尼比试验研究

刘鑫; 李飒; 刘小龙; 陈文炜

doi:10.11779/CJGE201909024

南海钙质砂的动剪切模量与阻尼比试验研究 English Version

刘鑫¹,
李飒^1, ,,
刘小龙²,
陈文炜²

1. 天津大学建筑工程学院,天津 300072;
2. 中国船舶重工集团公司第702研究所,江苏无锡 214082

基金项目: 国家自然科学基金重点项目（51239008）; 国家自然科学基金重大项目（51890911）; 工信部高技术船舶科研计划项目（2016-[22]）

详细信息

作者简介:
刘鑫(1995— ),男,博士研究生,主要从事海洋土性质和土动力学方面的研究。E-mail: liuxintju@163.com。

通讯作者:
李飒，E-mail：lisa@tju.edu.cn

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出版历程
- 收稿日期: 2018-09-09
- 发布日期: 2019-09-24

Experimental study on dynamic shear modulus and damping ratio of calcareous sands in the South China Sea

1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;
2. China Ship Research Center, China Shipbuilding Industry Corporation, Wuxi 214082, China

摘要

摘要: 岩土体的动剪切模量和阻尼比是土工建筑物、近海场地动力稳定性分析中的主要动力学参数,为评价南海钙质砂的动力学特性,利用美国GCTS共振柱测试系统,对取自南海地区的钙质砂进行共振柱试验,研究固结压力、相对密实度对其动剪切模量和阻尼比的影响,并与石英砂进行对比分析。研究发现：相同的试验条件下,钙质砂的最大动剪切模量、阻尼比均大于石英砂;从总体而言,钙质砂的动剪切模量在剪应变小于0.1%时大于石英砂动剪切模量,在大于0.1%时两者趋于一致,其动剪切模量比G/G_max随剪应变γ衰减的速度快于石英砂。根据试验结果建立钙质砂动剪切模量比G/G_max、阻尼比D的数学模型,并结合现有的钙质砂动剪切模量比及阻尼比研究成果,给出钙质砂动剪切模量比和阻尼比的变化范围,为钙质砂场地工程建设中建筑物动力稳定性分析提供依据。
- 钙质砂 /
- 石英砂 /
- 共振柱试验 /
- 动剪切模量 /
- 阻尼比
Abstract: The dynamic shear modulus and damping ratio are two important parameters for the dynamic stability analysis of geotechnical structures and offshore sites. In order to evaluate the dynamic characteristics of calcareous sand in the offshore sites, the resonant column tests are performed on the calcareous sand by GCTS resonant column apparatus. Meanwhile, the effects of effective confining pressure and relative density on the dynamic shear modulus and damping ratio are investigated and compared with those of the quartz sand. It is found that the calcareous sand shows higher maximum dynamic shear modulus, higher damping ratio, and faster stiffness degradation than the quartz sand under similar states of effective confining pressure and relative density. Generally speaking, the calcareous sand shows higher G_max than the quartz sand when the shear strain is less than 0.1%. Finally, a mathematical model for the normalized dynamic shear modulus and damping ratio of the calcareous sand is established according to the test results in this study. Based on the existing researches on the calcareous sand, the variation ranges of the normalized dynamic shear modulus and damping ratio of the calcareous sand are given, and they may provide the basis for the dynamic stability analysis of buildings in the construction of calcareous sand sites.
- calcareous sand /
- quartz sand /
- resonant column test /
- dynamic shear modulus /
- damping ratio

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