Effect of cyclic shear on interface characteristics of geogrid-soil-gravel mixture

QI Tian; KONG Jian-jie; LIU Fei-yu

doi:10.16285/j.rsm.2022.1589

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Effect of cyclic shear on interface characteristics of geogrid-soil-gravel mixture

更新时间：2026-06-25

- Effect of cyclic shear on interface characteristics of geogrid-soil-gravel mixture
- Vol. 44, Issue 9, Pages: 2593-2602(2023)
- 作者机构：
  
  1. 广州环保投资集团有限公司,广东,广州,510330
  2. 上海大学力学与工程科学学院,上海,200444
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.1589
  CLC： TU41
- Online First：02 September 2023，
  
  Published：2023
- 稿件说明：
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QI Tian, KONG Jian-jie, LIU Fei-yu. Effect of cyclic shear on interface characteristics of geogrid-soil-gravel mixture[J]. 2023, 44(9): 2593-2602.
DOI：

QI Tian, KONG Jian-jie, LIU Fei-yu. Effect of cyclic shear on interface characteristics of geogrid-soil-gravel mixture[J]. 2023, 44(9): 2593-2602. DOI： 10.16285/j.rsm.2022.1589.

摘要

为了研究不同含石量下土石混合体−格栅界面的循环剪切特性，采用循环直剪仪，在不同的竖向应力、剪切位移幅值和剪切频率下进行了单调直剪试验、循环直剪试验和循环后单调直剪试验，探究了5种含石量（0%、25%、50%、75%、100%）、3种剪切位移幅值（1、3、6 mm）和3种剪切频率（0.2、1.0、2.0 Hz）对土石混合体−格栅界面的峰值剪切应力和体变规律的影响。试验结果表明，含石量在0%～75%之间时，随着含石量的增大，土石混合体−格栅界面的循环峰值剪切应力和最大剪切刚度均随之提高，最终竖向位移绝对值和最大阻尼比随之减小；含石量继续增大至100%，土石混合体−格栅界面的最大峰值剪切应力和最大剪切刚度均随之减小，最终竖向位移的绝对值和最大阻尼比随之增大。在同一含石量下，剪切位移幅值和剪切频率越大，界面最大峰值剪切应力和最终竖向位移绝对值也越大。与单调直剪试验相比，循环后单调直剪试验得到的内摩擦角和似黏聚力有所增加，含石量在0%～75%的范围内，内摩擦角和似黏聚力随含石量的增大而线性增加，含石量继续增加至100%，内摩擦角和似黏聚力随之减小。

Abstract

In order to study the cyclic shear characteristics of soil-rock mixture-geogrid interface under different gravel contents

monotonic direct shear tests

cyclic direct shear tests and post-cyclic monotonic direct shear tests were carried out under different vertical stresses

shear displacement amplitudes and shear frequencies by using cyclic direct shear apparatus. The effects of five gravel contents (0%

25%

50%

75%

100%)

three shear displacement amplitudes (1

6 mm) and three shear frequencies (0.2

1.0

2.0 Hz) on the peak shear stress and volume change of soil-rock mixture-grid interface were investigated. The test results show that when the gravel content is between 0% and 75%

with the increase of gravel content

the cyclic peak shear stress and maximum shear stiffness of the soil-rock mixture-grid interface increase

and the absolute value of final vertical displacement and the maximum damping ratio decrease. When the gravel content continues to increase to 100%

the maximum peak shear stress and maximum shear stiffness of the soil-rock mixture-grid interface decrease

and the absolute value of final vertical displacement and the maximum damping ratio increase. Under the same gravel content

a great shear displacement amplitude and a high shear frequency lead to a high maximum peak shear stress and the absolute value of final vertical displacement of the interface. Compared with the monotonic direct shear test

the internal friction angle and quasi-cohesive force obtained by the monotonic direct shear test after the cycle increase. In the range of 0%−75% gravel content

the interface friction angle and quasi-cohesive force increase linearly with the increase of gravel content. When the gravel content continues to increase to 100%

the interface friction angle and quasi-cohesive force decrease.

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