基于AHP-FCE方法的气泡混合轻质土耐久性评估

Durability assessment of foamed mixture lightweight soil based on analytic hierarchy process and fuzzy comprehensive evaluation (AHP-FCE)

为提高气泡混合轻质土的耐久性能,将层次分析法(AHP)和模糊综合评价法(FCE)相结合,对气泡混合轻质土耐久性进行综合全面评估。基于气泡混合轻质土的物理力学性质,从初步设计、施工工艺和运行管理角度出发,选择相应的影响因子,建立了影响因子等级标准;建立了基于目标层、准则层和指标层的气泡混合轻质土耐久性综合评估模型,通过AHP法确定下一层次相对于上一层次的影响权重,并对判断矩阵进行一致性检验,证明了影响因子权值分配的合理性;构建了适用于各影响因子的隶属函数,计算相应的隶属度,并给出模糊综合评价的具体方法;以广东某高速公路S03标段收费岛范围的轻质土路基为实例,对该项目进行耐久性综合评估,证明了AHP-FCE方法的实用性与可靠性。

In order to improve the durability of foamed mixture lightweight soil （ FMLS ） , the analytic hierarchy process （AHP） and fuzzy comprehensive evaluation （FCE） were combined to comprehensively evaluate the durability of FMLS. Based on the physical and mechanical properties of FMLS, the influencing factors were selected from the point of view of preliminary design, construction technology, and operation management, and the grade classification of influencing factors was established. The comprehensive evaluation model of FMLS＇ durability was established based on the target layer, criterion layer, and index layer. The weight of the lower layer relative to the upper layer was determined by the AHP, and the consistency check of the judgment matrix was conducted to prove the rationality of the distribution of influencing factors＇ weight. The membership function suitable for each influencing factor was built to calculate the membership degree, and the specific method of fuzzy comprehensive evaluation is presented. Using the lightweight soil subgrade in the charging island along the S03 section of a highway in Guangdong Province as an example, its durability was evaluated, demonstrating the practicality and reliability of AHP-FCE.