含水率对花岗岩残积土-织物界面剪切特性的影响

刘飞禹; 宋文捷; 付冬平

doi:10.11835/j.issn.2096-6717.2024.021

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含水率对花岗岩残积土-织物界面剪切特性的影响

土木工程 | 更新时间：2026-03-30

- 含水率对花岗岩残积土-织物界面剪切特性的影响
- Effect of moisture content on shear characteristics of granite residual soil-geotextile interface
- 土木与环境工程学报 2026年48卷第2期页码：51-61
- 作者机构：
  
  1.上海大学力学与工程科学学院，上海 200444
  2.北京市市政工程设计研究总院有限公司，北京 100082
- 作者简介：
  
  刘飞禹（1976- ），男，教授，博士，博士生导师，主要从事加筋土及土动力学研究，E-mail：lfyzju@shu.edu.cn。
- 基金信息：
  
  国家自然科学基金(52378355;52078285)
- DOI：10.11835/j.issn.2096-6717.2024.021
  中图分类号： TU443
- 收稿：2024-01-24，
  
  纸质出版：2026-04-25
- 稿件说明：
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刘飞禹,宋文捷,付冬平.含水率对花岗岩残积土-织物界面剪切特性的影响[J].土木与环境工程学报,2026,48(02):51-61.

LIU Feiyu,SONG Wenjie,FU Dongping.Effect of moisture content on shear characteristics of granite residual soil-geotextile interface[J].Journal of Civil and Environmental Engineering,2026,48(02):51-61.
刘飞禹,宋文捷,付冬平.含水率对花岗岩残积土-织物界面剪切特性的影响[J].土木与环境工程学报,2026,48(02):51-61. DOI： 10.11835/j.issn.2096-6717.2024.021.

LIU Feiyu,SONG Wenjie,FU Dongping.Effect of moisture content on shear characteristics of granite residual soil-geotextile interface[J].Journal of Civil and Environmental Engineering,2026,48(02):51-61. DOI： 10.11835/j.issn.2096-6717.2024.021.

摘要

作为一种广泛分布于中国东南沿海地区的特殊土，花岗岩残积土的特性容易受到水的影响，从而诱发灾害。为研究花岗岩残积土-土工织物界面的剪切特性，通过室内大型直剪仪分析不同含水率（12%、16%、20%、24%）和不同竖向应力（50、100、150、200 kPa）等因素对界面抗剪强度参数的影响；建立离散元模型，揭示不同含水率条件下花岗岩残积土-土工织物界面在剪切过程中的细观机理。数值模拟揭示了剪切带的形态变化和颗粒的位移规律，由于中间织物的存在，上下盒力链无法贯通，不同含水率条件下法向、切向接触力的主方向相同；能量损耗主要发生在土与土颗粒的滑移中。

Abstract

As a special soil widely distributed in the southeast coastal areas of China

granite residual soil is greatly influenced by water

leading to significant changes in its mechanical properties and greater susceptibility to disasters. To investigate the shear characteristics of the granite residual soil-geotextile interface

the effects of different moisture contents (12%

16%

20%

24%) and vertical stresses (50

100

150

200 kPa) were analyzed through large-scale direct shear tests. Based on the test results

the PFC2D model was established to reveal the meso-mechanism of the graniteresidual soil-geotextile interface under varying moisture content conditions during the shearing process. The results show that the interfacial shear strength and friction angle decrease with increasing moisture content

while the apparent cohesion increases first and then decreases

reaching the maximum value at a moisture content of 16%. Numerical simulation also shows the morphology of the shear zone and the displacement of soil particles. The presence of geotextile prevents the penetration of force chains between the upper and lower sections

and the primary directions of normal and tangential contact forces remain consistent under different moisture contents. Energy dissipation mainly occurs during the sliding between soil and soil particles.

关键词

Keywords

references

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