砂土-建筑垃圾再生混合料回填路基使用性能试验研究  

Experimental Study on the Performance of Sand-construction Waste Recycled Mixtures for Subgrade Backfill

作　　者：管玉见 牛玲 王静 刘元强 许斌 于克伟 GUAN Yujian;NIU Ling;WANG Jing;LIU Yuanqiang;XU Bin;YU Kewei(Henan Pulu Expressway Company Limited,Zhengzhou 450016,China;Henan Traffic Investment Group Limited,Zhengzhou 450016,China;Zhonglu Gaoke(Beijing)Highway Technology Company Limited,Beijing 100088,China)

机构地区：[1]河南省濮鲁高速公路有限公司,郑州450016 [2]河南交通投资集团有限公司,郑州450016 [3]中路高科(北京)公路技术有限公司,北京100088

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第6期1179-1184,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金(52308453)。

摘　　要：文中通过室内试验分别测试了5类建筑垃圾混合料和砂土的成分、级配及物理力学特性,分析了路基应用场景下建筑垃圾混合料的破碎规律,建立了优化砂土-建筑垃圾混合料配合比设计方法,研究了砂土掺量(质量分数0%、20%、40%、60%和80%)对再生混合料最大干密度、最佳含水率、压实和承载性能的影响.结果表明:骨料公称最大粒径和级配对建筑垃圾混合料填筑路基的使用性能具有显著影响;5类级配建筑垃圾混合料中Ⅰ类和Ⅱ类混合料的骨料相对破碎率和破碎指数均较小,同时Ⅰ类混合料承载特性最好;掺入砂土可以改变建筑垃圾混合料级配结构,随着砂土掺量增加,建筑垃圾混合料最佳含水率降低,最大干密度和CBR值均先增大后减小;由CBR值的二次函数预估模型可知:砂土掺量45%时混合料填筑路基承载能力最好.The composition,gradation and physical and mechanical properties of five kinds of construction waste mixtures and sand were tested by indoor tests,and the crushing law of construction waste mixtures in subgrade application scenarios was analyzed.A design method for optimizing the mixture ratio of sand and construction waste was established,and the effects of sand content(0%,20%,40%,60%and 80%by mass)on the maximum dry density,optimum moisture content,compaction and bearing capacity of recycled mixture were studied.The results show that the nominal maximum particle size and gradation of aggregate have significant influence on the performance of construction waste mixture filling subgrade.Among the five kinds of graded construction waste mixtures,the relative crushing rate and crushing index of aggregates of Class I and Class II mixtures are small,and the bearing capacity of Class I mixture is the best.Adding sand can change the gradation structure of construction waste mixture.With the increase of sand content,the optimum water content of construction waste mixture decreases,and the maximum dry density and CBR value increase first and then decrease.According to the quadratic function prediction model of CBR value,it can be known that the bearing capacity of mixture filling subgrade is the best when the sand content is 45%.

关 键 词：路基工程 建筑垃圾再生混合料 砂土 路用性能 CBR值 最大干密度 

分 类 号：U414[交通运输工程—道路与铁道工程]