建筑垃圾填料与土工合成材料加筋剪切性能研究  

Study on reinforced shear behavior of construction waste filler and geosynthetics

作　　者：李丽华 文贝 胡智 石安宁 余长道 张蒋 LI Lihua;WEN Bei;HU Zhi;SHI Anning;YU Changdao;ZHANG Jiang(School of Civil Engineering and Architecture and Environment, Hubei University of Technology, Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《武汉大学学报（工学版）》2019年第4期311-316,共6页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51678224;51778217);湖北省杰出青年基金项目(编号:2018CFA063);湖北省中央引导地方科技发展专项项目(编号:2018ZYYD005);湖北省教育厅重点项目(编号:D20151402);湖北省高等学校优秀中青年科技创新团队计划项目(编号:T201605)

摘　　要：针对不同掺量建筑垃圾废弃混凝土与砂土混合作为路基填料,通过大型土工合成材料直剪仪,对不同掺量混合土以及铺设三向土工格栅、土工格室筋材后的加筋体分别进行剪切性能分析.试验结果表明:只掺入建筑垃圾填料时,其掺量为40%或60%能有效提高抗剪强度,其抗剪强度最高可达纯砂的1.5倍;根据界面剪切强度系数得出掺入过多或者过少建筑垃圾填料都会削弱整体抗剪性能;掺入一定的建筑垃圾填料再与土工合成材料进行复合加筋,总体而言土工格室复合加筋效果优于三向土工格栅,并且当建筑垃圾填料掺量为60%时,与土工格室进行复合加筋,其抗剪强度是纯砂的1.6倍,抗剪性能较优.For the construction and demolition waste concrete of different contents mixed with sand as a subbase filler, through a large scale direct shear test equipment on geosynthetics, a shear characteristic analysis of the composite soil of different contents and laying the triaxial geogrids, geocell reinforcements after reinforcing is made. The results show that the concrete contents is only 40% or 60%, the shear strength can be improved;and the highest shear strength reaches 1.5 times more than that of pure sand. According to the interface shear strength coefficient, Too much or too little waste concrete contents will weaken the overall shear performance. In general,when a certain waste concrete contents is reinforced with geosynthetics compositely, composite reinforcement effect of geocell is better than that of triaxial geogrids;and when the waste concrete of 60% content is reinforced with the geocell, of which the shear strength is 1.6 times more than that of pure sand, which means the shear performance is excellent.

关 键 词：建筑垃圾 三向土工格栅 土工格室 剪切性能 

分 类 号：TV476[水利工程—水工结构工程]