岩土力学 ›› 2022, Vol. 43 ›› Issue (2): 365-376.doi: 10.16285/j.rsm.2021.1371

• 基础理论与实验研究 • 上一篇    下一篇

土工膜-土工布界面动力剪切特性试验研究

侯娟1, 2, 3,邢行1,徐东1,陆向前1   

  1. 1. 上海大学 力学与工程科学学院,上海 201900;2. 弗吉尼亚大学 工程学院,夏洛茨维尔 弗吉尼亚州,22904 美国; 3. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉430071
  • 收稿日期:2021-08-18 修回日期:2021-11-03 出版日期:2022-02-11 发布日期:2022-02-22
  • 作者简介:侯娟,女,1975年生,博士,副教授,主要从事环境岩土工程、土工合成材料、填埋场膨润土垫的理论以及工程应用等方面的研究。
  • 基金资助:
    国家自然科学基金(No. 51778353,No. 51978390);国家留学基金(No. CSC201906895014);岩土力学与工程国家重点实验室开放基金课题 (No. Z018007);中国科学院青年创新促进会项目(No. 2017376)

Experimental study on dynamic shear characteristics of a geomembrane-geotextile interface

HOU Juan1, 2, 3, XING Xing1, XU Dong1, LU Xiang-qian1   

  1. 1. College of Mechanics and Engineering Science, Shanghai University, Shanghai 201900, China; 2. School of Engineering, University of Virginia, Charlottesville, VA 22904, USA; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2021-08-18 Revised:2021-11-03 Online:2022-02-11 Published:2022-02-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51778353, 51978390), the China Scholarship Council (CSC201906895014), the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (Z018007) and the Youth Innovation Promotion Association of CAS (2017376).

摘要: 糙面土工膜(GMX)和无纺土工布(GT)是垃圾填埋场中周边衬垫系统的重要组成部分,其界面特性对于整体填埋场的稳定性尤为重要。但是,目前对GMX-GT界面的动力剪切特性研究较少。为此,利用大型直剪仪,开展了一系列全饱和条件及干燥条件下GMX-GT界面的循环剪切试验,主要研究了竖向应力、位移幅值和循环次数等对GMX-GT界面动力剪切特性的影响,并对比分析了全饱和及干燥两种条件下GMX-GT界面动力剪切特性的差异。研究结果表明,随着位移幅值的增加,GMX-GT界面呈现出由剪切硬化向剪切软化转变的特性。循环剪切作用使得界面的内摩擦角随着位移幅值的增加而增大。GMX-GT界面主要表现为剪缩特性,且总剪缩量随竖向应力、位移幅值和循环次数的增加而增加。剪切刚度随竖向应力和循环次数的增大而增大,随位移幅值的增大而减小。阻尼比随位移幅值的增大而增大,随循环次数的增加而减小,说明位移幅值会增加GMX-GT界面的能量的耗散。GMX-GT界面在干燥条件下的破坏模式与饱和条件下的存在明显差异,干燥条件下GT内部的破坏更加显著,全饱和条件下GMX表面的破坏更加明显。

关键词: 土工膜-土工布界面, 循环剪切试验, 动力剪切特性, 剪切刚度, 阻尼比

Abstract: Textured geomembrane (GMX) and non-woven geotextile (GT) are important components of the liner system in MSW landfills. GMX-GT interface characteristics are sensitive to the stability of landfills. However, the dynamic behavior of the GMX-GT interface is not well understood. A series of cyclic direct shear tests was conducted on the GMX-GT interface under dry and fully saturated conditions. The effects of vertical stress, displacement amplitude, and cycle times on the dynamic behavior of the GMX-GT interface were studied. The dynamic behaviors of the GMX-GT interface under dry and fully saturated conditions were compared. The results demonstrated that the GMX-GT interface changed from shear hardening to shear softening with the increase of displacement amplitude. Meanwhile, the internal friction angle of the GMX-GT interface increased with the increase of displacement amplitude due to the cyclic shear. The GMX-GT interface was mainly characterized by shear shrinkage. The total shear shrinkage increased with the increase of vertical stress, displacement amplitude and cycle times. The shear stiffness increased with the increase of vertical stress and cycle times, while decreased with the increase of displacement amplitude. The damping ratio increased with the increase of displacement amplitude and decreased with the increase of cycle times, indicating that the displacement amplitude increased the energy dissipation of GMX-GT interface. The failure pattern was obvious different under the two conditions. The internal failure of GT was more significant under dry conditions, and the surface failure of GMX was more obvious under fully saturated conditions.

Key words: geomembrane-geotextile interface, cyclic shear test, dynamic shear characteristics, shear stiffness, damping ratio

中图分类号: TU 592
[1] 董林, 陈强, 夏坤, 李彦苍, 李燕, 王晓磊. 细粒土黏性对液化与循环软化特性影响研究[J]. 岩土力学, 2025, 46(S1): 228-237.
[2] 刘璐, 李帅学, 张鑫磊, 高洪梅, 王志华, 肖杨. 微生物加固珊瑚砂动剪切模量与阻尼比特性研究[J]. 岩土力学, 2025, 46(11): 3410-3420.
[3] 张大伟, 李昊泽, 刘飞禹, 冯忞, . 双向循环荷载作用下胶−砂粒径比对橡胶砂剪切特性影响[J]. 岩土力学, 2024, 45(S1): 239-247.
[4] 王丽艳, 蒋飞, 庄海洋, 王炳辉, 张雷, 李明, . 考虑水化期影响的橡胶−钢渣填料动力特性与微观分析[J]. 岩土力学, 2024, 45(S1): 53-62.
[5] 周恩全, 白宇航, 姚缘, 王龙, 陆建飞, . 橡胶混合黏土小应变剪切模量特性试验研究[J]. 岩土力学, 2024, 45(3): 705-713.
[6] 王盛年, 苏俊, 郭双枫, 谷雷雷, 陈泽玮, 赵凯, . 地聚物稳定粗粒填料静动力学特性试验研究[J]. 岩土力学, 2023, 44(S1): 350-364.
[7] 陈国兴, 韩勇, 梁珂, . 徐州城区黏性土与粉土的动剪切模量与阻尼比特性[J]. 岩土力学, 2023, 44(S1): 163-172.
[8] 秦悠, 杜歆宇, 马维嘉, 吴琪, 陈国兴, . 不同循环应力路径下饱和珊瑚砂超静孔压增长的改进应力模型[J]. 岩土力学, 2023, 44(6): 1729-1738.
[9] 王奕霖, 李飒, 段贵娟, 李怀亮, 赵福臣. 深海超软土动剪切模量与阻尼比特性研究[J]. 岩土力学, 2023, 44(11): 3261-3271.
[10] 庄心善, 周荣, 周睦凯, 陶高梁, 金合意. 孔隙溶液对循环荷载作用下膨胀土 累积变形及阻尼比影响研究[J]. 岩土力学, 2022, 43(S2): 1-10.
[11] 李水江, 童艳光, 王军, 应梦杰, 刘飞禹, . 双向循环荷载作用下砾石−格栅界面动力剪切特性[J]. 岩土力学, 2022, 43(S2): 291-298.
[12] 刘汉香, 别鹏飞, 李欣, 魏应松, 王铭萱, . 三轴多级循环加卸载下千枚岩的力学特性及 能量耗散特征研究[J]. 岩土力学, 2022, 43(S2): 265-274.
[13] 原鹏博, 朱磊, 钟秀梅, 董兰凤, 谌文武, . 酶诱导碳酸钙沉淀加固遗址土动力特性试验研究[J]. 岩土力学, 2022, 43(12): 3385-3392.
[14] 庄心善, 周睦凯, 陶高梁, 周 荣, 彭承鸿, 林万锋. 循环荷载下发泡聚苯乙烯改良膨胀土动弹性 模量与阻尼比试验研究[J]. 岩土力学, 2021, 42(9): 2427-2436.
[15] 刘飞禹, 江淮, 王军, . 砾石−格栅界面循环剪切软化特性试验研究[J]. 岩土力学, 2021, 42(6): 1485-1492.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
No Suggested Reading articles found!