路基填料建筑固废混凝土的力学特性及颗粒破碎研究  

Research on Mechanical Properties and Particle Crushing of Construction Solid Waste Concrete as Subgrade Filler

作　　者：于楠 宋杨 秘贝 李雪健 齐子怡 YU Nan;SONG Yang;BEI Bei;LI Xuejian;QI Ziyi(School of Civil Engineering,Hebei University of Engineering,Handan,Hebei 056038,China;Department of Traffic Engineering,Hebei University of Water Resources and Electric Engineering,Cangzhou,Hebei 061001,China;Hebei Key Laboratory of Geotechnical Engineering Safety and Deformation Control,Cangzhou,Hebei 061001,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]河北水利电力学院交通工程系,河北沧州061001 [3]河北省岩土工程安全与变形控制重点实验室,河北沧州061001

出　　处：《中外公路》2025年第2期73-82,共10页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:51978237);河北省高等学校科研重点项目(编号:ZD2021068);河北水利电力学院基本科研业务费重点培育项目(编号:SYKY2302);河北省大学生科技创新能力培育专项。

摘　　要：建筑固废常用作路基填筑材料,其力学性质受含水率及压实度的影响较大。为了探究含水率和压实度对建筑固废的力学特性及颗粒破碎性能等参数的影响规律,利用室内大型直剪试验和颗粒筛分试验,在最大干密度一定的情况下,以不同含水率、不同压实度的试样为研究对象,在50 kPa、100 kPa、150 kPa 3种不同的法向应力条件下开展大型直剪试验研究,并分析建筑固废剪切前后的颗粒破碎特性。结果表明:建筑固废剪切前后断面的颗粒破碎形态较为明显,可划分为破裂、磨耗、研磨3种类型,在剪应力-剪切位移曲线上出现“跳跃”现象,建筑固废的黏聚力随含水率降低或压实度的增加而增大,内摩擦角随含水率的减小或压实度的增加而增大,建筑固废整体上的筛分统计表现为颗粒级配曲线上移,建筑固废颗粒的相对破碎率随着含水率的减小或压实度的增大而增大。Construction solid waste is often used as subgrade filler,and its mechanical properties are greatly affected by moisture content and compaction degree.To explore the influence of these factors on the mechanical and particle crushing performance of construction solid waste,laboratory large-scale direct shear tests and particle screening tests were conducted.This study analyzed samples with varying moisture content and compaction degrees under a certain maximum dry density.The large-scale shear tests were carried out under three normal stress conditions:50 kPa,100 kPa,and 150 kPa,and the particle crushing characteristics of construction solid waste before and after shearing were analyzed.The results reveal notable changes in particle crushing form of the section before and after shearing of construction solid waste,which can be categorized into three types:rupture,abrasion,and grinding.The shear stress-shear displacement curve shows a“jumping”phenomenon.The cohesion of construction solid waste increases with the decrease in moisture content or the increase in compaction degree.Similarly,the internal friction angle rises with decreased moisture content or a higher degree of compaction.The overall screening statistics of construction solid waste show that the particle gradation curve moves upward,and the relative crushing rate of particles increases as moisture content decreases,or compaction degree increases.

关 键 词：建筑固废 路基填料 力学特性 颗粒破碎 

分 类 号：U416.1[交通运输工程—道路与铁道工程]