季冻区公路路基砂类土冻胀分类研究

CLASSIFICATION OF FROST HEAVE FOR SUBGRADE SAND SOIL OF HIGHWAYS IN SEASONAL FROST REGIONS

针对季冻区公路路基用土未按照土的分类标准进行冻胀分类的现状,本文对不同含泥量的砂类土在不同含水量、饱和度和密实度状态下进行了一系列闭式冻胀模拟试验。用数理统计方法分别研究了不同含泥量砂类土的冻胀率随含水量的变化规律,并且依据现行公路土的分类标准进行了冻胀分类,为公路勘察、设计、施工和维护提供重要的参考,并为季冻区公路设计规范的编制提供可靠的资料。

At present, the subgrade soil of highway in seasonal frost region is not classified with frost heave in accordance with the soil classification standards. This paper presents the test results from a series of closed simulated frost heave tests with sand soil of different clay contents under different water contents, degree of saturations and compactness. Using statistics, the changes of frost heaving ratio of sand soil with different clay contents under different water contents are examined. The classification of frost heave on sand soil with the current standard is performed. The results are of reference value to survey, design, construct and maintain highway, and to provide the reliable materials for the establishment of the designing specification of highways in seasonal frost regions.