考虑级配影响的珊瑚砂最大动剪切模量试验研究

梁珂; 岳冲; 周正龙; 杭天柱

doi:10.11835/j.issn.2096-6717.2022.121

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考虑级配影响的珊瑚砂最大动剪切模量试验研究

防震减灾工程 | 更新时间：2023-11-21

- 考虑级配影响的珊瑚砂最大动剪切模量试验研究
- Small-strain shear modulus prediction model related to grain gradation of coral sand
- 土木与环境工程学报 2023年45卷第6期页码：95-103
- 作者机构：
  
  1.北京工业大学城市与工程安全减灾教育部重点实验室,北京 100124
  2.南京工业大学岩土工程研究所,南京 210009
- 作者简介：
  
  梁珂（1991- ），男，博士，主要从事土动力学研究，E-mail：liangk91@163.com。
- 基金信息：
  
  北京市自然科学基金(8224082);中国博士后科学基金(2021M700309)
- DOI：10.11835/j.issn.2096-6717.2022.121
  中图分类号： TU441;TU411.8
- 收稿：2022-07-27，
  
  纸质出版：2023-12-25
- 稿件说明：
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梁珂,岳冲,周正龙等.考虑级配影响的珊瑚砂最大动剪切模量试验研究[J].土木与环境工程学报,2023,45(06):95-103.

LIANG Ke,YUE Chong,ZHOU Zhenglong,et al.Small-strain shear modulus prediction model related to grain gradation of coral sand[J].Journal of Civil and Environmental Engineering,2023,45(06):95-103.
梁珂,岳冲,周正龙等.考虑级配影响的珊瑚砂最大动剪切模量试验研究[J].土木与环境工程学报,2023,45(06):95-103. DOI： 10.11835/j.issn.2096-6717.2022.121.

LIANG Ke,YUE Chong,ZHOU Zhenglong,et al.Small-strain shear modulus prediction model related to grain gradation of coral sand[J].Journal of Civil and Environmental Engineering,2023,45(06):95-103. DOI： 10.11835/j.issn.2096-6717.2022.121.

摘要

对不同级配的南沙岛礁珊瑚砂进行共振柱试验，测试不同孔隙比

的珊瑚砂在20~300 kPa围压下的最大动剪切模量

，分析不均匀系数

、平均粒径

和细粒含量

对珊瑚砂

的影响，并建立珊瑚砂的

经验模型。结果表明：珊瑚砂的孔隙比

普遍大于陆源砂砾土；同一有效围压

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=50179495&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=50179491&type=

1.18533325

4.14866638

下，珊瑚砂的

曲线随

的增大而降低，随

的增大而升高，以

≈20%为界，随

的增大先降低后缓慢升高；陆源砂砾土的

经验模型将低估珊瑚砂的

值；

对

影响的本质是不同细粒含量的珊瑚砂具有不同的

和

，

和

对

的影响隐含了

对

的影响。基于Hardin模型给出考虑

、

影响的珊瑚砂

预测模型，并引入修正系数

，以考虑颗粒类型等复杂因素的综合影响，采用不同海洋珊瑚砂的试验数据对

预测模型进行验证。

Abstract

A series of resonant column tests were conducted on coral sand taken from the Nansha Islands

South China Sea with different grain gradations. The small-strain shear modulus

of the coral sands with various void ratio

with the confining stress of 20~300 kPa was obtained. The influence of coefficients of uniformity

mean particle size

and fines content

of coral sand was investigated

and the

formulation for coral sand was established. For the constant effective confining pressure

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=50179496&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=50179500&type=

1.18533325

4.14866638

the curve of

moves downward as the increasing

and moves upward as the increasing

. The

firstly decreases and then increases as the increasing

and the

reaches the minimum value for

of about 20%. The

prediction equations of terrigenous sandy and gravelly soils will obviously underestimate the

value of coral sand. The influence of

essentially results from the change of

and

for coral sand with various

. The

prediction equation of coral sand related to

and

which implies the influence of

was proposed

and the correction factor

related to the morphology and mineralogy of the particle form of coral sands was incorporated in the proposed

prediction equation. The validity of the

prediction equation was verified by comparing the measured and predicted

values of coral sands from different seas.

关键词

Keywords

references

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