[目的] 研究路基易损性，为泥石流地区路基防治等级的确定和路基承灾能力评估提供一种有效的方法。[方法] 根据路基遭受泥石流灾害破坏的情况，并结合前人对易损性的研究成果，提出路基易损性的概念。根据路基承灾特点和泥石流致灾特征，从泥石流作用效应和路基结构抗力2方面系统分析路基的地质选址、设计、施工、维修养护及泥石流致灾因子对路基易损程度的影响，选取路基易损性评价指标，确定路基易损性评价指标体系，并借助于层次分析法确定各级指标权重，然后采用岭型分布函数确定指标隶属度，最后运用模糊综合评价法建立路基易损性评价模型，进行路基易损性评估。[结果] 该方法对公路一处路基进行易损性评价，结果为中度易损性。[结论] 评价结果与现场实际情况相符，证实了该方法的可行性。
[Objective] The vulnerability assessment of subgrade was studied in order to provide an effective method for the determination of prevention rank and the assessment of the disaster-bearing capability of subgrade.[Methods] According to the subgrade suffering from debris flow and previous research, the concept of subgrade vulnerability was proposed. Based on the characteristics of the subgrade and debris flow, the influences of the subgrade geological location, the design, the construction and the operation maintenance on subgrade vulnerability were systemically analyzed. Then the evaluating indicators of subgrade vulnerability were determined. The weights of indicators at all levels were determined by using the AHP(analytic hierarchy process) method, and the ridge distribution function was used to calculate the membership grades of indicators. The assessment model of subgrade vulnerability was finally established based on the fuzzy comprehensive evaluation.[Results] The established model was applied to assess one subgrade of the highway and the result was moderate vulnerability.[Conclusion] The evaluation result was consistent with the actual situation, and confirmed the feasibility of the method.