加筋土石混合体动力特性

doi:10.13229/j.cnki.jdxbgxb.20221604

吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (10): 2897-2907.doi: 10.13229/j.cnki.jdxbgxb.20221604

• 交通运输工程·土木工程 • 上一篇

加筋土石混合体动力特性

李丽华^1,²(),康浩然^1,²,张鑫^1,²,肖衡林^1,²(),刘一鸣^1,²,周鑫隆^1,²

^1.湖北工业大学土木建筑与环境学院，武汉 430068
^2.湖北省生态道路工程技术研究中心，武汉 430068

收稿日期:2022-12-16 出版日期:2024-10-01 发布日期:2024-11-22
通讯作者: 肖衡林 E-mail:researchmailbox@163.com;xiaohenglin_0909@163.com
作者简介:李丽华（1980-），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);国家自然科学基金联合基金重点项目(U22A20232);湖北省基金创新群体项目(2024AFA009);湖北省高等学校优秀中青年科技创新团队项目(T2023006)

Dynamic characteristics of reinforced soil-rock mixture

Li-hua LI^1,²(),Hao-ran KANG^1,²,Xin ZHANG^1,²,Heng-lin XIAO^1,²(),Yi-ming LIU^1,²,Xin-long ZHOU^1,²

^1.School of Civil Engineering，Architecture and Environment，Hubei University of Technology，Wuhan 430068，China
^2.Hubei Ecological Road Research and Engineering Center，Wuhan 430068，China

Received:2022-12-16 Online:2024-10-01 Published:2024-11-22
Contact: Heng-lin XIAO E-mail:researchmailbox@163.com;xiaohenglin_0909@163.com

摘要/Abstract

摘要：

为探究土石混合体在循环荷载作用下的动力特性，采用大型动三轴试验仪，研究两种不同粒径类型土石混合体永久变形规律以及不同加筋方式下土石混合体滞回圈演变、动弹性模量及阻尼比发展规律。研究结果表明：不同动应力幅值下试样轴向应变（ε）-振动次数（N）曲线符合安定理论，且更符合双曲线模型发展规律，加筋作用能显著提高土石混合体试样动力稳定性；动应力幅值较大时，掺入大粒径砾石（GL）土石混合体试样较掺入小粒径砾石（GS）土石混合体试样咬合摩擦作用更显著，累积塑性变形更小。土石混合体作为非均质工程材料，循环加载过程中，滞回圈在低循环次数下呈现“锯齿状”，30次加载循环前后，格栅加筋试样动弹性模量增长率提高，阻尼比由不稳定波动开始减小。对比不同加筋试验数据，结果表明：土工格室加筋增强土石混合体韧性及刚度效果优于双向土工格栅加筋。

关键词: 岩土工程, 加筋土石混合体, 大型动三轴试验, 滞回圈, 动弹性模量, 阻尼比

Abstract:

In order to investigate the dynamic properties of SRM under cyclic loading， the law of permanent deformation of soil-rock mixture （SRM） with two different particle size types， the evolution of hysteresis circle， dynamic elastic modulus and damping ratio development law of SRM under different reinforcement methods are investigated by large dynamic triaxial test. The experimental results show that the axial strain （ε）-vibration number （N） curve of the specimen under different dynamic stress amplitude is consistent with the shakedown theory and more in line with the hyperbolic model development law. The reinforcement effect significantly improves the dynamic stability of the SRM specimen； when the dynamic stress amplitude is larger， the occlusal friction effect of the SRM specimen mixed with large gravel（GL） is more significant than that of the SRM specimen mixed with small gravel（GS）， and the accumulated plastic deformation is smaller. As an inhomogeneous engineering material， the hysteresis loop shows a "sawtooth" shape at low cycle times during cyclic loading. Before and after 30 loading cycles， the growth rate of the dynamic elastic modulus of the geogrid-reinforced specimen increases， and the damping ratio begins to decrease from the unstable fluctuation. Comparing different reinforcement test data， the results show that the geocell reinforcement enhances the resilient and stiffness of SRM better than the biaxial geogrid reinforcement.

Key words: geotechnical engineering, reinforced soil-rock mixture, large dynamic triaxial test, hysteresis loop, dynamic elastic modulus, damping ratio

中图分类号:

TU414

李丽华,康浩然,张鑫,肖衡林,刘一鸣,周鑫隆. 加筋土石混合体动力特性[J]. 吉林大学学报(工学版), 2024, 54(10): 2897-2907.

Li-hua LI,Hao-ran KANG,Xin ZHANG,Heng-lin XIAO,Yi-ming LIU,Xin-long ZHOU. Dynamic characteristics of reinforced soil-rock mixture[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(10): 2897-2907.

图/表 18

表1

图1

表2

砾石基本物理力学指标"

颜色	吸水率/%	针片状含量/%	毛体积相对密度 $γ b$
灰黑色	0.4	5.0	2.81

表2

图2

表3

图3

图4

表4

动三轴试验设计参数"

试样编号	围压 $σ 3$ /kPa	动应力幅值 $σ d$ /kPa
GL-W	100	50、75、100、125
GS-W	100	50、75、100、125
GL-G1	100	100
GL-G3	100	100
GS-G1	100	100
GS-G3	100	100
GL-C1	100	100
GL-C3	100	100
GS-C1	100	100
GS-C3	100	100

表4

图5

图6

图7

图8

图9

图10

图11

图12

图13

表5

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土工格室型号	TGLG-PP-50-400
格室片抗拉强度/MPa	24
延伸率/%	7.6
断裂伸长率/%	9.8
焊接处抗拉强度/（kN·m^-1）	10
最大拉伸力/MPa	102.8

试样	G1	G3	C1	C3
GL	0.1908	0.1857	0.1695	0.1471
GS	0.2005	0.1817	0.1860	0.1621

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加筋土石混合体动力特性

Dynamic characteristics of reinforced soil-rock mixture

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