城市地下空间的营造与开发会产生大量的盾构渣土,传统的渣土处理方式对生态环境和资源保护带来重大挑战,将胶凝材料和盾构渣土结合后制备的再生固化充填材料(RSS-ER)可有效地解决这一难题。在确定水固比为0.35前提下,选择矿粉、粉煤灰和硅粉进行不同的正交组合,并开展不同配合比RSS-ER的流动性试验、无侧限抗压强度试验及微观结构试验。研究表明:RSS的流动性可满足一般回填工程中对于充填材料的要求;RSS-ER的无侧限抗压强度与养护时间呈正向关系,且室内常温养护的试件强度高于水下养护的试件;渣土骨架间的孔隙被水化产物C-S-H凝胶和C-A-S-H凝胶充填,是RSS-ER整体性及强度得以提高的原因。
The construction and development of urban rail transit and underground space produce a large amount of shield muck. However, the traditional muck treatment method brings great challenges to the ecological environment and resource protection. In view of this, the Recycled Solidified Soil-Engineering Residue (RSS-ER) prepared by combining cementitious materials with shield muck effectively solves this problem. Under the premise of ensuring that the water-solid ratio is 0.35, mineral powder, fly ash and silicon powder are selected for different orthogonal combinations, and the fluidity test, unconfined compressive strength test and microstructure test of RSS-ER with different mixing ratios are carried out. Research shows that fluidity of RSS can meet the requirements of filling materials in general backfill engineering; the unconfined compressive strength of RSS-ER is positively related to the curing time, and the strength of the specimen cured at room temperature is higher than that of specimens cured under water; the pores between the slag skeletons are filled with the hydration products C-S-H gel and C-A-S-H gel, which is the reason why the integrity and strength of RSS-ER are improved.
[1]李杰, 陈儀涛, 董毅萌, 等.盾构渣土免烧陶粒的制备及其性能[J]. 安徽工业大学学报(自然科学版), 2021, 38(3):250-254.(Li Jie, Chen Xitao, Dong Yimeng, et al. Preparation of non-fired haydite from shield muck and its properties[J].Journal of Anhui University of Technology ( Natural Science Edition ), 2021,38(3):250-254. (in Chinese))
[2]谢发之, 李海斌, 李国莲, 等.盾构渣土基碳复合陶粒的制备及除磷性能[J].应用化学, 2017, 34(2):211-219.(Xie Fazhi, Li Haibin, Li Guolian, et al. Phosphate removal by using shield residues/carbon composite ceramsite[J].Chinese Journal of Applied Chemistry, 2017,34(2):211-219. (in Chinese))
[3]姜军尹, 宝党.盾构渣土制作新型墙材研究探析[J].砖瓦, 2019(3):45-48.(Jiang Jun, Yi Baodang. Research on development of new wall materials by shield muck [J]. Brick and Tile Magazine, 2019(3):45-48. (in Chinese))
[4]郭爱锋, 魏小凡, 王瑶, 等.渣土免烧砖的制备及性能研究[J].非金属矿, 2021, 44(3):99-102. (Guo Aifeng, Wei Xiaofan, Wang Yao, et al. Study on preparation and properties of unburned brick by building waste [J]. Non-Metallic Minerals, 2019(3):45-48.(in Chinese))
[5]郭卫社, 王百泉, 李沿宗, 等.盾构渣土无害化处理源、化利用现状与展望[J].隧道建设(中英文), 2020, 40(8):1101-1112. (Guo Weishe, Wang Baiquan, Li Yanzong, et al. Status quo and prospect of harmless disposal and reclamation of shield muck in china [J]. Tunnel Construction, 2020,40(8):1101-1112 (in Chinese))
[6]陈新, 徐涛, 李可, 等.深圳市开发建设项目弃土管理现状与对策[J].中国水土保持, 2014(12):22-24. (Chen Xin, Xu Tao, Li Ke, et al. Present situation and countermeasures of waste soil management of development and construction projects in Shenzhen [J]. Soil and Water Conservation in China, 2014(12):22-24 (in Chinese))
[7]郭淇文. 南京地区地下开挖工程渣土固化利用试验研究[D].南京:东南大学, 2019. (Guo Qiwen. Experimental study on solidification and utilization of muck in underground excavation engineering in Nanjing area [D]. Nanjing: Southeast University, 2019. (in Chinese))
[8]宋学锋, 朱娟娟. 矿渣复合基地质聚合物力学性能的影响因素[J].西安建筑科技大学学报(自然科学版), 2016, 48(1):128-132. (Song Xuefeng, Zhu Juanjuan. Influencing factors of mechanical properties of slag composite base geopolymer [J]. Journal of Xi'an University of Architecture and Technology (Natural Science Edition ), 2016,48(1):128-132 (in Chinese))
[9]张大捷, 田晓峰, 侯浩波, 等.矿渣胶凝材料固化软土的力学性状及机制[J].岩土力学, 2007, 28(9):1987-1991. (Zhang Dajie, Tian Xiaofeng, Hou Haobo, et al. Mechanical properties and mechanism of slag cementitious material solidifying soft soil [J]. Rock and Soil Mechanics, 2007, 28(9):1987-1991.(in Chinese))
[10]Wang B, Yang W, Li Z. Micromechanism of strength increase with curing time for compacted cement-soil[J]. Journal of University of Science & Technology Beijing, 2008, 30(3):233-238.
[11]梁仕华, 陈俊涛, 林焕生, 等.水泥固化淤泥废弃土作为填土材料的试验研究[J]. 广东工业大学学报, 2020, 37(2):102-106. (Liang Shihua, Chen Juntao, Lin Huansheng, et al. Experimental study on cement solidified sludge waste soil as filling material [J]. Journal of Guangdong University of Technology, 2020,37(2):102-106.(in Chinese))
[12]张琬昕, 杜晓丽, 徐凤旺, 等.新型CG-SF固化土的力学特性研究[J].重庆科技学院学报(自然科学版),2022,24(3):84-89, 94. (Zhang Wanxi, Du Xiaoli, Xu Fengwang, et al. Research on mechanical properties of new CG-SF solidified soil [J]. Journal of Chongqing University of Science and Technology (Natural Science Edition), 2022,24(3):84-89, 94. (in Chinese))
[13]王福晋,赵磊,梁勇,等.建筑垃圾渣土制备固化土配合比参数研究[J].建筑技术,2021,52(7):801-804. (Wang Fujin, Zhao Lei, Liang Yong, et al. Study on the mix ratio parameters of solidified soil prepared from construction waste residue [J].Building Technology,2021,52(7):801-804. (in Chinese))
[14]卢青. 基于固弃物的土壤固化剂配合比设计及固化土路用性能研究[D].济南:山东大学,2019. (Lu Qing.Study on mixture ratio design of soil stabilizer based on solid waste and road performance of solidified soil [D].Jinan: Shandong University, 2019. (in Chinese))
[15]朱伟,赵笛,范惜辉,等.渣土改良为流动化回填土的应用[J].河海大学学报(自然科学版),2021,49(2):134-139. (Zhu Wei, Zhao Di, Fan Xihui, et al. Application of slag soil improvement to flowing backfill [J]. Journal of Hohai University (Natural Science Edition ), 2021,49(2):134-139. (in Chinese))
