首页|隧道弃渣级配碎石细观力学参数研究

隧道弃渣级配碎石细观力学参数研究

Mesoscopic mechanical parameters of graded aggregates from tunnel waste slug

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  • 国家科技期刊平台
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  • NSTL
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隧道弃渣级配碎石作为道路基层填料,能有效避免资源浪费与环境污染.有限元方法将其视为连续介质进行研究时存在一定局限性,而采用离散元对颗粒材料进行模拟时,细观参数对其宏观力学性质的影响并不明确.基于三轴压缩试验和数值模拟,通过正交控制参数变化分析,揭示了颗粒间细观参数与宏观力学参数之间的关联性,明确了细观参数对隧道弃渣级配碎石路用力学性能的影响.结果表明:细观参数中,切向黏结强度对黏聚力值的影响最大,而摩擦系数与内摩擦角值变化联系更密切;初始杨氏模量与刚度比呈负相关,其他参数对其影响不大;与泊松比相关的变化关系中,刚度比与切向黏结强度较其他参数对其影响更大.研究成果可为颗粒流模拟级配碎石的细观参数标定提供参考,也为级配碎石作为道路基层填料的力学性能研究提供了基础.
The application of tunnel waste slug,which is employed as road base fill,can effectively re-duce resource wastage and environmental pollution.However,when it is studied as a continuous medium by means of finite element methods,there are inherent limitations.Moreover,in discrete element simula-tions of granular materials,the influence of mesoscopic parameters on the macroscopic mechanical proper-ties of the material remains unclear.Based on triaxial compression tests and numerical simulations,this study employs the orthogonal analysis to control parameter variations,so as to reveal the correlation be-tween granular mesoscopic parameters and macroscopic mechanical properties.Thus the impact of meso-scopic parameters on the road mechanical characteristics of graded tunnel waste slug is clarified.The re-sults indicate that among the mesoscopic parameters,shear bond strength has the most significant impact on cohesive strength,whereas the friction coefficient exhibits a closer relationship with the internal fric-tion angle;the initial Young's modulus is negatively correlated with the stiffness ratio,while other pa-rameters having negligible impact.In the variation relationship related to Poisson's ratio,the stiffness ra-tio has a more pronounced influence than the others.These research findings can not only provide a refer-ence for the calibration of mesoscopic parameters in particle flow simulations of graded aggregate but also offer a basis for the research on mechanical properties of graded aggregates as road base fill.

tunnel waste sluggraded aggregateparticle flow simulationtriaxial compression testme-soscopic parameter

岳夏冰、董耿志、丁同、蒋双全

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长安大学公路学院,陕西西安 710064

四川公路桥梁建设集团有限公司,四川成都 610041

隧道弃渣 级配碎石 颗粒流模拟 三轴压缩试验 细观参数

国家重点研发计划项目四川交通运输厅项目陕西省重点研发计划项目陕西省科学技术研究与发展计划项目

2112212200422020-ZL-B12018GY-1552016NY-218

2024

10.11705/j.issn.1672-643X.2024.04.20

水资源与水工程学报
西北农林科技大学

水资源与水工程学报

CSTPCD北大核心
影响因子：0.512
ISSN：1672-643X
年,卷(期)：2024.35(4)