Abstract: When green construction of railway embankments is carried out in mountainous areas, it is necessary to consider not only avoiding environmental damage caused by roadbed construction activities but also minimizing the costs of engineering investment. Its green coupling efficiency can help to rationalize the allocation of engineering investment and to promote the high-quality development of “roadbed-environment” green construction. Firstly, the green coupling efficiency was defined and a “roadbed-environment” input-output black box model was proposed to construct a basic framework for analyzing green coupling efficiency. Then, a network DEA model was used to compare and evaluate the green coupling efficiency of roadbed engineering and the efficiency of each sub-stage. Moreover, the entropy weighted TOPSIS model was combined to analyze the coupling status of roadbed engineering. Finally, the key factors that affected the green coupling efficiency were analyzed and mined by the obstacle degree model, which provided theoretical reference for improving the green and efficient coordination status of roadbed engineering. The results indicate that the green coupling efficiency of mountainous roadbed engineering is not high, and there is a certain waste of design resources. The low efficiency of the construction impact stage is the main factor affecting the overall coupling efficiency. The green coupling efficiency and input-output superposition relationship present three states: “low, high, high”, “high, high, high”, and “low, low, high”. Most roadbed sections are in a green low efficiency coupling state. The reasons that affect the green coupling efficiency of “roadbed-environment” in mountainous areas are different. The obstacle degree model can be used for differentiation analysis to obtain rational suggestions.

Key words: railway engineering; network DEA; entropy weighted TOPSIS; obstacle degree model

摘要： 在山区进行铁路路基绿色建设时，既要考虑避免路基建设活动对环境的损害，又要尽量降低工程投入的成本，对其进行绿色耦合效率分析有助于工程投入合理化配置，推动“路基-环境”绿色化建设高质量发展。首先，对绿色耦合效率进行定义并提出“路基-环境”投入产出黑箱模型，构建绿色耦合效率分析基本框架；随后，采取网络DEA模型对路基工程的绿色耦合效率和各子阶段的效率进行比较评价，并结合熵权TOPSIS模型共同分析路基工程的耦合状况；最后，通过障碍度模型分析并挖掘影响绿色耦合效率的关键因素，为提升路基工程绿色高效协调状态提供了理论参考。结果表明：山区路基工程绿色耦合效率不高，存在一定的设计资源浪费，施工影响阶段效率低是影响整体耦合效率的主要因素；绿色耦合效率及投入产出叠加关系呈现3种状态“低高高”、“高高高”、“低低高”，大部分路基标段均处于绿色低效耦合状态；影响山区“路基-环境”绿色耦合效率的原因不同，可利用障碍度模型进行差异化分析，得到合理化建议。

关键词: 铁道工程；网络DEA；熵权TOPSIS；障碍度模型