突变级数法在多年冻土区公路路基稳定性评价中的应用——以G213国道祁连段为例

Application of Catastrophe Progression Method in the Stability Evaluation of Subgrade in Permafrost Area—A Case Study of G213 National Highway in Qilian, Qinghai Province

摘要: 多年冻土区公路路基稳定性问题一直是理论和实践研究的热点，本文拟采用突变级数法对青海省G213国道祁连段公路路基稳定性进行评价。依据39组土工试验数据，从黏聚力、内摩擦角、压缩系数、天然密度、孔隙比、含水率、渗透系数等7个底层控制指标出发，综合考虑各控制指标对岩土体工程地质性质的影响。结果显示，突变级数的大小可以表示岩土体的工程性质等级，岩土体的力学性质、物理性质和渗透系数对岩土体工程性质敏感程度不同，岩土体的力学性质和物理性质对岩土体的工程性质影响较大，渗透系数影响较小。

Abstract: The stability of highway subgrade in permafrost areas has always been a hot topic of theoretical and practical research. In this paper, the catastrophe progression method is proposed to evaluate the subgrade stability of the G213 National Highway in Qilian, Qinghai Province. Based on 39 sets of geotechnical test data, starting from 7 bottom control indexes such as cohesion, internal friction angle, compressibility, natural density, void ratio, water content, and permeability coefficient, we comprehensively consider the impact of each control index on the geotechnical properties of geotechnical engineering. The results show that the catastrophe progression method can represent the engineering property level. The mechanical properties, physical properties, and permeability coefficient of soil mass are sensitive to different grades of engineering properties of soil mass. The mechanical properties and physical properties of soil have a great influence on its engineering property grade, while the permeability coefficient has little influence.