颗分试验在利用红黏土作填料中的应用

Application of the Size Distribution Testing in the Using Red Clay into Padding

研究目的:广西是我国红黏土集中分布的地区之一,近年来,因该地区兴建大量铁路、公路等基础建设,以红黏土作为路堤填料的问题也日渐显现。本文通过颗分试验对红黏土进行岩土定名及分类,进而解决该地区的红黏土是否能直接作为路基填料的问题。研究结论:(1)根据颗分试验中的砾石含量,将该地区红黏土分为"低液限黏土"、"高液限黏土"、"含砾高液限黏土"、"细粒土质砾"4个亚类;(2)根据这4个亚类的物理、力学性质,指出"含砾高液限黏土"、"细粒土质砾"这两类红黏土可以直接作为路基填料;"低液限黏土"类红黏土仅可直接用作路基93填方区的填料;而"高液限黏土"类红黏土仅在采用"包边、晾晒"或"掺砾石、石灰等进行改良"之后,方可用作路基93填方区的填料;(3)本研究成果对广西地区的工程勘察和设计等工作有一定的指导意义。

Research purposes： Guangxi is one of the concentrating distribution areas of the red clay. In recent years, there are many infrastructures of the railway and road in this area, so the matters using red clay into embankment padding present gradually. This paper first defines and classifies the red clay in the way of the size distribution test, and solves whether or not the red clay is directly used into padding. Research conclusions： （1） According to gravel content of size distribution test, the red clay is classified into four subclasses, which contain ＂high liquid limit soil＂, ＂ low liquid limit soil＂, ＂ high liquid limit soil containing gravel＂ and ＂grave containing fine -grained soil＂. （2） Based on the physical and mechanical properties of the four subclasses, the two types of red clay of ＂ high liquid limit soil containing gravel＂ and ＂ grave containing fine - grained soil＂ can directly be used as subgrade filling, the red clay of ＂low liquid limit soil＂ only can be directly used as roadbed fill in the 93 area, the red clay of ＂high liquid limit soil＂ may be used as roadbed fill in the 93 area after adopting the ＂package edge, drying＂ or ＂mixed gravel and lime improved＂. （3） The research result has a guiding significance for the survey and design of geology in Guangxi area.