由于天然气长输管道管径大、距离长、压力高、路途地况复杂多变、"三穿"及沿途补偿投资额大且不确定因素多,导致工程项目投资很大,其中线路工程的费用占总投资60%~70%,因此在设计过程中应对线路进行多方案比选.通过具体实例分析,对模糊综合评价法在线路路由优化比选中的应用进行了探讨和研究.采用层次分析法确定评价指标的权重,根据给出的评价标准和实测值,经过模糊交换后对投资、技术方案和抗风险能力做出综合评价,运用模糊手段来处理实际问题,以使评价结果更真实、更合理,为投资决策提供有力支撑.%Long-distance gas pipeline engineering design project has such features as large pipeline diameter, long distance, high pressure, complex terrain along the pipeline route and other uncertain factors, which will result in very high investment costs. Thereinto, pipeline route engineering design costs account for about 60% to 70% of the total investment costs. Therefore, route scheme comparison is very important in the design process. Through concrete example analysis, the application of fuzzy comprehensive evaluation method in route selection and optimization is discussed. The analytic hierarchy process ( AHP) is applied to determine the weight of the evaluation indexes and to make a comprehensive evaluation according to the given evaluation standard and measured values on such aspects as less cost, better technical proposal and stronger resistance to risk after fuzzy exchange and the fuzzy method is applied to deal with ambiguity problem so as to make the evaluation results more real and reasonable and provide strong support for investment decisions.
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