铁路路基挡墙碳减排方案优选及降碳策略研究  

Carbon emission reduction scheme of railway subgrade retaining wall and carbon reduction strategies

作　　者：鲍学英[1] 申中帅 刘北胜 李慧 李子龙 BAO Xueying;SHEN Zhongshuai;LIU Beisheng;LI Hui;LI Zilong(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Institute of Computing Technologies,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中国铁道科学研究院集团有限公司电子计算技术研究所,北京100081

出　　处：《铁道科学与工程学报》2024年第9期3842-3853,共12页Journal of Railway Science and Engineering

基　　金：中国国家铁路集团有限公司科技研究开发计划实验室基础研究项目(L2023Z001)。

摘　　要：铁路路基挡墙在铁路路基全生命周期产生的碳排放不可忽视。为探析不同类型挡墙碳排放水平,选取3种典型挡墙展开研究,提取碳减排最优方案并剖析不同策略组合对其碳排放影响,进而提出碳减排综合策略。首先基于LCA理论,将加筋土挡墙、重力式挡墙及土钉墙全生命周期碳排放分为建材生产、建材运输、施工建造与运营维护4个阶段,基于功能单位,利用碳排放因子法并依据碳排放计算模型测算各类型挡墙各阶段与总碳排放量。研究结果表明,加筋土挡墙因边坡植被固碳能力使其全生命周期表征出固碳效应,且固碳量为197.300 t,重力式挡墙与土钉墙总碳排放量分别为489.344 t和51.834t,故将加筋土挡墙作为碳减排最优方案。然后以加筋土挡墙为研究对象,提取其设计阶段碳排放影响因素,并利用敏感性分析方法识别出其碳排放最敏感的因素为边坡植被类型,其次为挡墙坡度。最后选取百喜草、结缕草、黑麦草3种植被与1∶0.4、1∶0.5、1∶0.6、1∶0.7这4种坡度,分析不同策略组合对加筋土挡墙全生命周期碳排放综合影响。研究表明,对碳汇能力较强的百喜草,降低坡度可提高全生命周期固碳量;对碳汇能力一般的结缕草,避免不利坡度以提高全生命周期固碳量;对碳汇能力较弱的黑麦草,提升坡度可提高挡墙全生命周期固碳量。研究成果可为铁路挡墙降碳设计提供理论依据。The carbon emission generated by railroad retaining wall in the whole life cycle of railroad foundation cannot be ignored.To explore the carbon emission level of different types of retaining walls,three typical retaining walls were selected to carry out the research,extracted the optimal scheme of carbon emission reduction and analyzed the impacts of different combinations of strategies on carbon emission,and then put forward a comprehensive strategy of carbon emission reduction.Firstly,based on the LCA theory,the carbon emission of the whole life cycle of reinforced soil retaining wall,gravity retaining wall and soil nail wall were divided into four phases.There were the production of building materials,transportation of building materials,construction and operation and maintenance.Based on the functional unit,the carbon emission factor method was utilized to calculate the carbon emission of each type of retaining wall in each phase and the total carbon emission according to the carbon emission calculation model.The results show that the reinforced earth retaining wall has a carbon sequestration effect throughout its life cycle due to the carbon sequestration capacity of slope vegetation,and the amount of carbon sequestration is 197.300 t.The total carbon emissions of gravity retaining wall and soil nail wall are 489.344 t and 51.834 t,respectively,so that the reinforced earth retaining wall is the optimal solution for carbon emission reduction.Then the reinforced earth retaining wall is taken as the research object to extract the carbon emission influencing factors in its design stage.The most sensitive factor of its carbon emission is identified as the slope vegetation type,followed by the slope of retaining wall by using sensitivity analysis method.Finally,three vegetation types of bermudagrass,knotweed and ryegrass with four slopes of 1∶0.4,1∶0.5,1∶0.6 and 1∶0.7 are selected to analyze the comprehensive effects of different strategy combinations on the carbon emissions of reinforced earth retaining w

关 键 词：铁路路基挡墙 LCA理论 碳排放计算模型 加筋土挡墙 敏感性分析方法 

分 类 号：U215[交通运输工程—道路与铁道工程]