基于DERU评定方法建立改进的DES综合评价方法，主要用于运营公路隧道土建结构定期检查的技术状况评定。根据运营公路隧道土建结构技术状况评定的要求，构建包括目标层、准则层、指标层的评价指标体系，其中以隧道构件的D结构劣化破损程度、E劣化范围与S安全程度为指标层评价指标，并提出对应的判定标准和指标权重。按照隧道分段、分幅、整体的次序，建立相应步骤的评价方法，分别采用状况指标、优选指标、安全程度折算长度等指标，在隧道定期检查结果的基础上对隧道土建结构的技术状况进行综合评定，并给出评定结果的分析方法和等级划分界限值。该方法能对运营公路隧道的管理、检测、养护等工作提供更为充分的信息，提高相关工作的效率。

The improved DES (degradation degree, degradation extent and safety degree) comprehensive evaluation system based on DERU (degradation degree, degradation extent, relevancy and urgency) method is mainly used to evaluate the periodic inspection of operation highway tunnel structures. The indexes system, including the target layer, criterion layer and index layer, is firstly established. The indexes of D (degradation degree), E (degradation extent) and S (safety degree) of tunnel components are adopted as evaluation indexes of index layer; and then the corresponding determining standards and weights are proposed as well. The process for the different evaluation steps, including section evaluation, singletube evaluation and twintube evaluation, is established. The indexes of CI (condition index), PI (priority index) and S′L′ (equivalent safety degree length) are applied to determine the technical conditions of tunnel structures based on the periodic inspection results. Meanwhile, the evaluation results can be analyzed and graded according to the given methods and standards. The DES method can provide more intensive information to improve the efficiency of management, inspection and maintenance work for operation highway tunnels.