土工格栅加筋建筑垃圾土循环剪切试验

doi:10.13229/j.cnki.jdxbgxb.20220930

吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (6): 1612-1623.doi: 10.13229/j.cnki.jdxbgxb.20220930

• 交通运输工程·土木工程 • 上一篇

土工格栅加筋建筑垃圾土循环剪切试验

李丽华^1,²(),李孜健^1,²,肖衡林^1,²(),曹文哲^1,²,周鑫隆^1,²,黄少平^1,²

^1.湖北工业大学土木建筑与环境学院，武汉 430068
^2.湖北工业大学河湖健康智慧感知与生态修复教育部重点实验室，武汉 430068

收稿日期:2022-07-24 出版日期:2024-06-01 发布日期:2024-07-23
通讯作者: 肖衡林 E-mail:researchmailbox@163.com;xiaohenglin_0909@163.com
作者简介:李丽华（1978-），女，教授，博士.研究方向：加筋土，路基工程，环境岩土工程.E-mail：researchmailbox@163.com
基金资助:
国家自然科学基金项目(52278347);湖北省自然科学基金创新群体项目(2024AFA009);湖北省重点研发计划项目(2022BCA059);湖北工业大学杰出人才基金项目(XJ2021000501)

Experiment on cyclic shear of geosynthetic reinforced construction waste soil

Li-hua LI^1,²(),Zi-jian LI^1,²,Heng-lin XIAO^1,²(),Wen-zhe CAO^1,²,Xin-long ZHOU^1,²,Shao-ping HUANG^1,²

^1.School of Civil Engineering，Architecture and Environment，Hubei University of Technology，Wuhan 430068，China
^2.Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake，Ministry of Education，Hubei University of Technology，Wuhan 430068，China

Received:2022-07-24 Online:2024-06-01 Published:2024-07-23
Contact: Heng-lin XIAO E-mail:researchmailbox@163.com;xiaohenglin_0909@163.com

摘要/Abstract

摘要：

为研究不同大小法向应力及剪切幅值条件下双向土工格栅加筋建筑垃圾土剪切特性，采用大型直剪仪对该加筋土开展单调直剪试验和循环剪切试验，揭示加筋建筑垃圾土循环剪切特性影响规律及工作机制。结果表明：建筑垃圾土在单调直剪试验和循环后直剪试验中均出现明显剪切软化现象，但同等法向应力条件下循环剪切后试样的界面抗剪增和残余强度均更高；在单调直剪试验中，剪切初期试样小幅度剪胀，随后明显剪缩，当剪切位移超过20 mm后试样剪缩速度变缓；在循环后单调直剪试验中，试样则表现出明显剪胀，且在相同剪切位移下会产生更大的体变；在循环剪切过程中，试样发生明显剪切硬化，且在循环剪切卸载方向上剪切硬化现象更为明显，阻尼比随界面刚度的增大而不断减小，在同一剪切幅值条件下，随着循环次数的增加，不同法向应力下界面阻尼比逐渐减小并趋于同一数值；不同方向上最大剪应力均随法向应力和剪切幅值的增大而增大，且随着循环次数的增加，剪切硬化程度也逐渐提高；循环后加筋建筑垃圾土试样抗剪强度明显提高，黏聚力和摩擦角增幅分别为22.4%和9.6%。

关键词: 岩土工程, 加筋建筑垃圾土, 双向土工格栅, 循环剪切试验, 单调直剪试验

Abstract:

In order to study the shear behavior of geosynthetic-soil interface reinforcement of biaxial geogrid reinforced construction waste under different sizes normal stress and shear amplitude， Monotonic direct shear test and cyclic shear test of the reinforced soil were carried out by large direct shear apparatus， thus， the influence law and mechanism of normal stress and shear amplitude on shear characteristics of reinforcement-soil interface were revealed. Results show that obvious shear softening occurs in both monotonic and post cyclic direct shear tests， however， the interfacial shear strength and residual strength of the specimens are greater after cyclic shear under the same normal stress conditions. In monotonic direct shear test， the sample exhibits a small expansion at the initial stage of shearing， followed by significant shrinkage， the shear shrinkage rate slows down when the shear displacement exceeds 20 mm. In the post cyclic monotonic direct shear test， the specimen shows obvious dilatancy and produces larger volumetric strain under the same shear displacement. During the cyclic shearing process， the sample undergoes obvious shear hardening， and the shear hardening phenomenon is more obvious in the cyclic shear unloading direction， damping ratio decreases with the increase of interface stiffness， under the same shear amplitude， the damping ratio decreases with the increase of cyclic number and tends to the same value under different normal stresses. The maximum shear stress in different directions increases with the increase of normal stress and shear amplitude， with the increase of cycle times， the degree of shear hardening also increases gradually. The shear strength of reinforced construction waste soil increased significantly after cyclic loading， and the increase of cohesion and internal friction angle is 22.4 % and 9.6 % respectively.

Key words: geotechnical engineering, reinforced construction waste soil, biaxial geogrid, cyclic shear test, monotonic direct shear test

中图分类号:

TU41

李丽华,李孜健,肖衡林,曹文哲,周鑫隆,黄少平. 土工格栅加筋建筑垃圾土循环剪切试验[J]. 吉林大学学报(工学版), 2024, 54(6): 1612-1623.

Li-hua LI,Zi-jian LI,Heng-lin XIAO,Wen-zhe CAO,Xin-long ZHOU,Shao-ping HUANG. Experiment on cyclic shear of geosynthetic reinforced construction waste soil[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(6): 1612-1623.

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材料	单位面积质量/（g·m^-2）	网孔尺寸长×宽/mm	极限延伸率/%		极限抗拉强度/（kN·m^-1）
材料	单位面积质量/（g·m^-2）	网孔尺寸长×宽/mm	横向	纵向	横向	纵向
聚丙烯	250	35×25	13.2	15.6	20

试验类型	法向应力/kPa	剪切幅值/mm
直接剪切试验	100， 200， 300	-
循环剪切试验	100， 200， 300	2
循环剪切试验	200	1，2，3
循环后直剪试验	100， 200， 300	2
循环后直剪试验	200	1，2，3

试验类型	c/kPa	φ/（°）
直剪试验	124.4	35.4
循环后直剪试验	152.3	38.8

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土工格栅加筋建筑垃圾土循环剪切试验

Experiment on cyclic shear of geosynthetic reinforced construction waste soil

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