School of Civil Engineering, Central South University, Changsha, China.
School of Civil Engineering, Anhui Jianzhu University, Hefei, China.
Comput Intell Neurosci. 2022 Apr 28;2022:6145755. doi: 10.1155/2022/6145755. eCollection 2022.
Railway engineering generates large amounts of construction and demolition waste (CDW). To quantify the amount of CDW generated from railway engineering projects throughout the whole life cycle, a process-based life cycle assessment model is proposed in this paper. The life-cycle CDW is divided into four parts: CDW from off-site transportation of construction materials (OSTCM), CDW from site operation wastage of construction materials (SOWCM), discard ballast from roadbeds, stationyard, bridges and tunnels (DB), and CDW from reparation and renewal of aging components (RRAC). Yun-Gui Railway is selected as a case study to validate the developed model, and an uncertainty analysis is conducted with Oracle Crystal Ball software. The results show that between 175 and 311 million tons of CDW is generated throughout the whole life cycle of Yun-Gui Railway. DB is the largest component of the life-cycle CDW from railway engineering projects. This indicates the negative environmental impacts of railway construction can be significantly mitigated by optimizing the location of ballast disposal sites and developing suitable landfill proposals. Also, the CDW generated by wastage of construction materials during off-site construction and site operation is important in waste management in railway engineering projects, in which rubble, sand, and cement have the high potential for waste reduction. Findings from this study can contribute to the knowledge body as well as the engineering practice in green railways.
铁路工程会产生大量的施工和拆除废物（CDW）。为了量化整个生命周期内铁路工程项目产生的 CDW 量，本文提出了一种基于过程的生命周期评估模型。生命周期 CDW 分为四部分：建筑材料场外运输产生的 CDW（OSTCM）、建筑材料现场作业损耗产生的 CDW（SOWCM）、道床、车站、桥梁和隧道废弃的道砟（DB）以及老化部件修复和更新产生的 CDW（RRAC）。选取云桂铁路作为案例研究来验证所开发的模型，并使用 Oracle Crystal Ball 软件进行了不确定性分析。结果表明，云桂铁路全生命周期内会产生 1.75 亿至 3.11 亿吨 CDW。DB 是铁路工程项目生命周期 CDW 的最大组成部分。这表明通过优化道砟处置场地的位置和制定合适的垃圾填埋场方案，可以显著减轻铁路建设对环境的负面影响。此外，场外施工和现场作业中建筑材料损耗产生的 CDW 对铁路工程废物管理也很重要，其中碎石、沙子和水泥具有较大的废物减排潜力。本研究的结果可为绿色铁路的知识体系和工程实践做出贡献。
