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本文以某高速公路路基软土为研究对象,在地质条件相近的、不同试验路段的软基加固方法(堆载预压、真空预压、真空-堆载联合预压)前后(加固时间达到3个月),工程单位分别进行了原位试验并采取软土样,开展了室内物理力学试验。结合工程单位所取的软土样进行了软土的微观结构试验,在试验的基础上,获得了软土在天然状态以及3种不同工况下的微结构图像,通过对图像处理得到加固前后的微结构特征参数。研究得出:在工程地质条件相近以及加固时间相同的情况下,无论是从宏观、微观结构,还是从固结过程和强度的增长上来看,3种工况的加固效果依次为:堆载预压→真空预压→真空-堆载联合预压。
In this paper, an expressway subgrade soft soil is taken as the research object. Before and after the consolidation of soft groundwork (preloading, vacuum preloading, vacuum preloading) of different test sections with similar geological conditions Month), engineering units were tested in situ and soft soil samples taken, carried out indoor physical and mechanical tests. Combined with the soft soil samples taken by engineering units, the microstructure test of soft soil was carried out. Based on the experiments, the microstructure images of soft soil under natural conditions and under three different conditions were obtained. The microstructure characteristic parameters. The results show that under the same geological conditions and the same reinforcement time, the reinforcement effects of the three conditions are as follows: Pressure → vacuum preload → vacuum - stacked preload.