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黑棉土是一种广泛分布于非洲东部的特殊岩土,它吸水膨胀、失水收缩,对公路工程项目的危害极大。该文以埃塞俄比亚AA高速公路为依托,介绍黑棉土成因、工程特性及处理方案。黑棉土处理应遵循“防渗、保湿”的原则,结合项目区域水文条件、地质条件和筑路材料分布等对路基进行综合处理;建议施工过程中应做好路基的动态检测工作,并根据现场情况做出动态的施工优化设计,以保证路基的质量和安全。
Black cotton soil is a kind of special geotechnical widely distributed in the eastern part of Africa. It absorbs water and swells, water loss and shrinkage, which is very harmful to highway projects. Based on the AA Highway in Ethiopia, this paper introduces the causes, engineering characteristics and treatment of black cotton soil. Black cotton soil treatment should follow the principle of “seepage prevention and moisturizing” and comprehensively deal with the subgrade in combination with the hydrological conditions, geological conditions and the distribution of road materials in the project area. It is suggested that the dynamic inspection of subgrade should be done in the construction process, And based on the situation to make dynamic construction optimization design to ensure the quality and safety of roadbed.