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南昆铁路膨胀泥岩是集胀缩性、碎裂性和低强度于一体的极软岩,建路先期在林逢膨胀泥岩路基试验工点对路堑边坡进行了多种组合的支挡、防护工程试验,重点试验工程是土钉墙类。由于事前对该膨胀泥岩的特性缺乏全面认识,工程试验历经曲折,从而对膨胀泥岩的危害有全新认识,积累了各类堑坡支护工程的适用性和结构设计的复杂经验教训。
The expansive mudstone of Nankun Railway is an extremely soft rock that combines swelling, crushing, and low strength. During the construction phase, a variety of combinations of retaining and retaining measures have been carried out for the cutting slope at the Linfeng Experimental Station of Expansive Mudstone Roadbed Engineering test, the key test project is soil nail wall type. Due to the lack of comprehensive understanding of the characteristics of the expansive mudstone in advance, the engineering experiment has experienced twists and turns, thus a new understanding of the hazards of expansive mudstone has accumulated and the complicated experience and lessons of various types of cutting slope support projects have been accumulated.