Classification and Treatment of High Liquid Limit Soil in Subgrade Engineering

Abstract

The invention discloses a method for classifying and treating high liquid limit soil in roadbed engineering, comprising the following steps: S1, mixing high liquid limit soil with quicklime to reduce water content; S2, adopting plasticity index, CBR value, liquid limit and fine Classify the high liquid limit soil in S1 according to the four indexes of particle content; S3, process the classified high liquid limit soil respectively. The present invention obviously reduces the moisture content of the soil, comprehensively considers the degree of difference in the improvement of various physical and mechanical properties of the soil by adding sand, quicklime, and cement, effectively improves the project quality, reduces the amount of spoil or borrowed soil, and saves project cost. Thereby promoting the scientific utilization of high liquid limit soil.

Description

technical field [0001] The invention relates to the field of construction, in particular to a method for classifying and treating high liquid limit soil in roadbed engineering. Background technique [0002] At present, the commonly used classification method for high liquid limit soil is based on plasticity index and fine particle content to divide high liquid limit soil into: high liquid limit clay, high liquid limit silt, sandy high liquid limit clay and sandy high liquid limit powder earth. See Table 1 for details. [0003] Table 1 Engineering classification of high liquid limit soil [0004] Soil liquid limit plasticity index Fine particle content less than 0.074mm high liquid limit clay ≥50％ ≥0.73(W L -20) ≥75％ High liquid limit silt ≥50％ ＜0.73(W L -20) ≥75％ Sandy high liquid limit clay ≥50％ ≥0.73(W L -20) 50%≤fine particle content≤75% Sandy high liquid limit silt ≥50％ ＜0.73(W...

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Problems solved by technology

[0005] Since the high liquid limit soil has many bad physical and mechanical properties such as high liquid plastic limit, high natural moisture content, low permeability, and high compressibility, the following problems need to be solved when using high liquid limit soil as embankment filler: First, the problem of high natural moisture content, high liquid limit and high plasticity index; second, the problem of low strength, high compressibility and low permeability; third, the problem of excessive fine particle content of high liquid limit soil and poor particle gradation ; and finally, issues of water stability and poor compaction performance

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