土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (3): 507-511.

• 测试技术 • 上一篇    下一篇

窄级配细砂动力特性共振柱试验研究

张华雨1，周 斌1，祝方才1，周俊杰1，王 杰2，刘鹏飞2，周正茂2   

  1. （1.湖南工业大学土木工程学院，湖南株洲 412007；2.中铁北京工程局集团第二工程有限公司，长沙 410116）
  • 收稿日期:2022-09-21 修回日期:2022-10-06 出版日期:2024-06-30 发布日期:2024-09-17
  • 作者简介:张华雨（1997-），男，硕士研究生，研究方向为粉细砂路基填筑。
  • 基金资助:
    湖南省自然科学株洲联合基金（2022JJ50087）

Experimental Study on the Dynamic Characteristics of a Coastal Silty Fine Sand with a Narrow Grain Size Distribution Using the Resonance Column System

ZHANG Huayu1, ZHOU Bin1, ZHU Fangcai1, ZHOU Junjie1, WANG Jie2, LIU Pengfei2， ZHOU Zhengmao2   

  1. (1.School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007；
    2.2nd Engineering Co. Ltd, China Railway Beijing Engineering Group Co. Ltd., Changsha 410116)
  • Received:2022-09-21 Revised:2022-10-06 Online:2024-06-30 Published:2024-09-17

摘要： 以海南环岛旅游公路路基填方为工程背景，研究作为路基填料的窄级配细砂之动力特性。通过室内筛分试验得出窄级配细砂的级配曲线，使用GDSRCA共振柱试验系统其进行试验研究，基于Hardin-Drnevich模型分析了同一含水量条件下动剪切模量和阻尼比随干密度和围压变化特征。研究表明，砂的动剪切模量随着动剪应变增加而降低，随着固结围压和干密度的增加而增加；干密度相同时，试样动剪切模量比随着围压增加而增大，阻尼比则减小，相同围压时，试样动剪切模量比随干密度增加而增大，阻尼比则减小；动剪切模量比和阻尼比具有一定离散性，阻尼比离散程度高于动剪切模量比。

关键词: 共振柱试验系统, 动剪切模量, 阻尼比

Abstract: The subgrade backfill material characteristics of a tourist highway surrounding the Hainan Island is presented as an engineering case history. The dynamic characteristics of a narrowly graded fine sand as the subgrade backfill material were studied in the paper. The gradation curve of the narrowly graded fine sand is obtained throughout the laboratory sieve analyses, with curvature coefficient of 1.0 and the non-uniformity coefficient of 2.0. The GDSRCA resonant column test system is used for the experimental study. Based on the Hardin Drnevich model, the characteristics of the dynamic shear modulus and the damping ratio variation with the dry density and the confining pressure under the same water content are analyzed. The dynamic shear modulus of the sand sample decreases with the increase of the dynamic shear strain and increases with the increase of the consolidation confining pressure and the dry density. When the dry density is the same, the dynamic shear modulus ratio of the sample increases with the increase of the confining pressure, and the damping ratio decreases. At the same confining pressure, the dynamic shear modulus ratio of the sample increases with the increase of the dry density, and the damping ratio increases.  ratio is reduced.  The dynamic shear modulus ratio and the damping ratio have a certain discreteness, and the discrete degree of damping ratio is higher than that of the dynamic shear modulus ratio.

Key words: Resonant Column Test System, Dynamic Shear Modulus, Damping Ratio

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