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Analysis on Improvement Effect of Expansive Soil by Soil-water Characteristic Curve

Author: LinLiPing
Tutor: YangHePing
School: Changsha University of Science and Technology
Course: Road and Railway Engineering
Keywords: Expansive soils Lime Fly ash RBI Pressure plate instrument Soil water characteristic curve Matric suction VG model
CLC: U416.1
Type: Master's thesis
Year: 2009
Downloads: 244
Quote: 3
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Abstract


The expansive soil absorbent significant expansion softening, dehydration shrinkage cracking and repeated deformation, is a kind of typical of poor engineering properties of unsaturated soils, lightweight structures built on it often severely damaged. Chemically modified project Treatment Methods for evaluation of improving the results usually soil strength, swelling and shrinkage and plasticity index indicators. To establish contact Unsaturated Soil Mechanics and Engineering This article explores propose a new evaluation method, which uses the soil water characteristic curve to evaluate the effect of improved expansive soil. Indoor lime, fly ash and RBI three amendments on Baise expansive soil improved each improvers are four kinds of ash, each test for soil samples 20, the basic nature of the test soil samples improved Soil variation before and after. Against the existing evaluation criteria, improving the results of the improved soil evaluation for unsaturated soils and soil water characteristic curve at the same time provide a reference. Were prepared at the same time improved soil in the a 5 ~ 1000KPa suction within pressure plate meter off the wet soil water characteristic curve tests, finishing the test results, and draw the soil water characteristic curve using a VG model fit the experimental data and found that the correlation is quite good, indicating that the test data is reasonable, credible. The test results show that the lime, fly ash soil property changes improved soil has good regularity, optimum moisture content, maximum dry density of free expansion, clay content and plasticity index decreases with increasing improver dose , while the RBI curing agent does not apply to the expansive soil improved. Analysis of lime, fly ash modified Soil water characteristic curve, the same regularity. Accordingly, based on the theory of unsaturated soil, control free swell test test indicators, explore the use of the moisture content of the saturated gravity intake values, residual moisture and the slope of the curve four indicators to evaluate the improvement effects of expansive soils. Further analysis pointed out that the four-index system as long as three to meet the requirements will be able to determine if the soil has reached improving the results. Saturated gravity moisture is essential indicators, and the remaining three indicators meet the standard can be only two. The study shows that the soil water characteristic curve can be used to evaluate the improvement effects of expansive soils. The establishment of a new index system can help people to better analyze the engineering properties of expansive soil improved.

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