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在饱和土力学理论的基础上,借鉴《公路高边坡抗震设计技术研究》课题,提出将基质吸力作为类黏聚力推导出一种间接考虑土的非饱和性的计算方法。在此计算方法的基础上依托黄延高速扩能工程,对黄土高边坡稳定性影响因素进行分析。通过分析发现将边坡的上部坡型进行简化会使计算结果更加可靠。基质吸力的考虑使边坡的安全系数增加,但是基质吸力对土的影响并非是无限的,当含水率较低时可不考虑基质吸力对边坡稳定性的影响。边坡的安全系数随着含水率的增加而降低,且降低幅度几乎成线性。
Based on the theory of saturated soil mechanics and referring to the topic of “Research on Seismic Design of Highway High Slope”, a method to calculate soil unsaturated degree indirectly is proposed by using the matrix suction as a kind of cohesion. Based on this calculation method, relying on Huangyan high-speed expansion project, the influencing factors on the stability of loess high slope are analyzed. The analysis shows that simplifying the upper slopes of slopes will make the calculation more reliable. The consideration of the matrix suction increases the safety factor of the slope, but the influence of the matrix suction on the soil is not unlimited. When the moisture content is low, the influence of the matrix suction on the slope stability can be ignored. The safety factor of slope decreases with the increase of moisture content, and the decreasing range is almost linear.