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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年05期

页码:

183-190

栏目:

岩土工程

出版日期:

2024-09-20

文章信息/Info

Title:

Study on long-term deformation characteristics of construction waste subgrade filler in rainy area

文章编号:

1673-2049(2024)05-0183-08

作者:

郑海华¹,吴 谦²,李翔宇²,叶君辉³,史小军²

(1. 温岭市城市发展投资集团有限公司,浙江 台州 317599; 2. 长安大学 公路学院,陕西 西安 710064; 3. 浙江铭友环境工程有限公司,浙江 台州 317599)

Author(s):

ZHENG Haihua¹, WU Qian², LI Xiangyu², YE Junhui³, SHI Xiaojun²

(1. Wenling City Development Investment Group Co., Ltd., Taizhou 317599, Zhejiang, China; 2. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 3. Zhejiang Mingyou Environmental Engineering Group Company Limited, Taizhou 317599, Zhejiang, China)

关键词:

建筑垃圾再生材料;  路基填料;  长期变形特性;  颗粒破碎机制

Keywords:

recycled material for construction waste;  subgrade filler;  long-term deformation characteristic;  particle breakage mechanism

分类号:

TU522.09

DOI:

10.19815/j.jace.2022.11063

文献标志码:

A

摘要:

为探究建筑垃圾再生材料对于多雨地区城市道路路基填料的适用性,借助人工初拣、筛分试验明确再生料的物质组成,借助点荷载试验研究水分对砖块强度特性的影响,并根据原材料基本特性对路基填料级配进行设计; 采用自行设计的室内大型土柱试验对浸水-失水循环过程中模型含水率与变形特性进行研究,对试验前后的再生材料回弹模量和级配进行分析。结果表明:所获取的建筑垃圾原材料以废弃砖、混凝土块及石块为主,天然级配不良; 将粒径为0～10 mm、10～20 mm的两档再生材料按照3:1的质量比掺配后的填料级配良好; 路基模型经多次浸水-失水循环后最终变形量为填高的0.62%; 多次循环后回弹模量衰减率为28.4%,仍满足填筑要求; 在荷载和水分共同作用下,粒径大于5 mm的颗粒二次破碎情况明显,而小于0.3 mm的颗粒较为稳定,破碎后的填料级配仍满足规范要求; 该级配下建筑垃圾作为路基填料在经多次浸水-失水循环后保持着良好的强度和水稳定性,可用于路基填筑。

Abstract:

In order to explore the applicability of construction waste recycling materials for urban road subgrade filler in rainy areas, the material composition of recycled materials was determined by manual initial sorting and screening tests. The influence of moisture on the strength characteristics of bricks was studied by point load test, and the gradation of subgrade filler was designed according to the basic characteristics of raw materials. The water content and deformation characteristics of subgrade during immersion-dehydration cycle were studied by self-designed large indoor soil column test, and the changes of resilient modulus and gradation of recycled materials before and after the test were analyzed. The results show that the raw materials of construction waste are mainly waste bricks, concrete blocks and stones, and the natural gradation is poor. After mixing 0-10 mm and 10-20 mm recycled fillers in a ratio of 3:1, the gradation is good. The final deformation of subgrade model after multiple immersion-dehydration cycles is 0.62% of the filling height. The attenuation value of resilient modulus after multiple cycles is 28.4%, but it still meets the filling requirements. Under the combined action of load and moisture, the secondary crushing of particles larger than 5 mm is obvious, while the particles smaller than 0.3 mm are relatively stable, and the filler gradation after crushing still meets the requirements. The construction waste maintains good strength and water stability after repeated soaking and dehydration cycles, which can be used for subgrade filling.

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[1]王海英,王喜川,张英治,等.建筑垃圾再生材料灰土挤密桩成桩应用试验[J].建筑科学与工程学报,2022,39(05):234.[doi:10.19815/j.jace.2022.04093]
　WANG Hai-ying,WANG Xi-chuan,ZHANG Ying-zhi,et al.Application Experiment of Construction Waste Recycled Lime Soil Compaction Pile[J].Journal of Architecture and Civil Engineering,2022,39(05):234.[doi:10.19815/j.jace.2022.04093]
[2]杨连祥,翁效林,胡继波,等.强降雨条件下高陡填方雪道路基稳定性分析[J].建筑科学与工程学报,2023,40(03):170.[doi:10.19815/j.jace.2021.11031]
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备注/Memo

备注/Memo:

收稿日期:2022-11-20
基金项目:国家自然科学基金青年科学基金项目(52308435); 住房和城乡建设部研究开发项目(2020-K-078); 陕西省自然科学基础研究计划项目(2021JQ-244); 浙江省住房和城乡建设厅2020年度城乡规划课题服务采购项目(CTZB-2020050374(3))
作者简介:郑海华(1979-),男,高级工程师,E-mail:422786015@qq.com。
通信作者:吴 谦(1989-),男,工学博士,讲师,E-mail:282497832@qq.com。

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更新日期/Last Update: 2024-09-30