摘要
为快速有效评价运营期高速公路膨胀土边坡稳定性并采取科学的预防性养护对策,考虑评价模型的科学性与公路边坡养护的可操作性,总结现有国内外膨胀土边坡研究成果,选择反映公路膨胀土边坡特点的边坡稳定性指标,建立膨胀土边坡稳定性分析的Fuzzy-AHP分析模型。Fuzzy-AHP模型由2级4类14项评价指标组成,包括:坡体状况(边坡高度、坡度、土性、裂隙深度);水力及气象特征(渗流、输水设施、降雨强度、地下水位);防护及加固措施(防护结构状况、加固结构状况、植被覆盖率);其他因素(开挖方式、破坏历史、地震)。该模型基于Fuzzy理论(模糊数学)及AHP层次分析权重确定方法,通过AHP方法确定指标权重,然后结合模糊分析理论计算各指标的相对隶属度向量,通过模糊综合评判对膨胀土边坡的稳定性进行分析,确定相应边坡稳定性等级,最后通过工程实例验证该模型的正确性。研究结果表明:应用该模型可以使膨胀土边坡稳定性评价更全面,更科学合理,更符合公路边坡工程实际;该方法简便可行,结论可靠,具有一定的优越性,可为相关部门膨胀土边坡养护决策提供参考。
In order to quickly and efficiently evaluate the stability of expansive soil slope and adopt scientific preventive maintenance countermeasure, considering the scientific of evaluation model and maneuverability of expressway slope maintenance, the existing domestic and abroad research achievements of expansive soil slope were summarized, and a Fuzzy-AHP analysis model with reasonable expansive soil slope stability evaluation index was set up according to the characteristics of expansive soil slope. The hierarchy model consists of two indexes layer with 4 main evaluation indexes and 14 basic examination indexes, i.e., condition of slope body （hight of slope, slope gradient, soil feature and depth of fissure）, the section characteristics of expansive soil slope （slope gradient, hight of slope, the relationship of slope direction and rock stratum occurrence）, hydraulic characteristics （drainage system, rainfall, groundwater）, other factors （slope failure history, seismic intensity, excavation method）. Based on fuzzy math and analytic hierarchy process, the weight of every index was obtained by making use of analytic hierarchy process, and the fuzzy math method was used to calculate the relative membership degree vector and make a comprehensive evaluation of expansive soil slope stability, thus the slope stability classification could be determined. Finally, the application of an engineering example verified the accuracy and the rationality of the model. The results show that the application of this model can make the evaluation of expansive soil slope stability more scientific, more reasonable, more corresponded to expressway slope engineering practice. This method is simple and feasible with the reliable result, and it has certain superiority to conventional mechanics analysis method. It can provide scientific basis for slope of expressway maintenance decision-making.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第2期622-628,共7页
Journal of Central South University:Science and Technology
基金
湖南省交通科技项目(201206)
公路工程省部共建教育部重点实验室(长沙理工大学)开放基金资助项目(kfj110104)
关键词
高速公路
膨胀土
边坡稳定性
层次分析
模糊数学
express way
expansive soil
slope stability
analytic hierarchy process
fuzzy mathematics
