Method of liquefaction resistance processing of filament reinforced sandy soil

Abstract

The invention relates to a method of liquefaction resistance processing of filament reinforced sandy soil. The method comprises the first step of preparation of raw materials, wherein polypropylene filaments or polyethylene filaments or polyurethane filaments or polyester filaments are adopted as filaments, the adulterate amount of the filaments is 0.2-0.8% of the weight of dry sandy soil, the dry sandy soil is siliceous sand, the grain diameter is 0.074-2mm, the specific gravity of the dry sandy soil is 2.65, the maximum dry density is 1.6g / cm, the sandy soil and water are fully stirred evenly, and then wet sandy soil of the water content being 10-15% is obtained; the second step of blending of the raw materials, wherein firstly the filaments prepared in the first step are fully dispersed through manpower or a small air blower, then the dispersed filaments and the wet sandy soil prepared in the first step are fully blended, the blending time is 20-30min, and finally the obtained material is compacted in a layered mode to form finished filament reinforced sandy soil. The method of the liquefaction resistance processing of the filament reinforced sandy soil can meet the requirements for liquefaction resistance of embankment projects such as side slopes, roadbeds, embankment foundations and banks under the condition of dry and wet circulation.

Description

technical field [0001] The invention belongs to the technical field of embankment engineering for rivers, lakes and seas, and in particular relates to a method for anti-liquefaction treatment of fiber reinforced sandy soil. Background technique [0002] Since the 1960s, intense earthquakes have occurred frequently around the world, especially the 7.6-magnitude Niigata earthquake in Japan in 1964, the 8.4-magnitude earthquake in Alaska in the United States in 1964, and the 7.8-magnitude Tangshan earthquake in China in 1976. In 2008, the magnitude 8.0 earthquake in Wenchuan, Sichuan, China, etc., all caused large-scale damage to rivers, lakes, sea embankments and other buildings due to sand liquefaction. For example, in the Niigata earthquake in Japan, the loss caused by sand liquefaction alone exceeded 1 billion In addition, such as the liquefaction of sand and soil under the action of other dynamic loads such as vibration and explosion, and the accompanying water spray sand,...

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Problems solved by technology

[0004] Chinese patent application 200610086081.7 proposes a "short fiber reinforced lime soil foundation treatment method", which uses short fiber reinforcement and lime mixed into engineering soil to improve the engineering properties of the soil, and short fiber reinforced lime As a filling material, soil has the advantages of compression resistance, shear resistance, crack resistance, high toughness, high water stability, and low expansion and contraction, but it still has the following obvious deficiencies: First, the liquefaction performance of anti-vibration is extremely poor, It cannot be applied to embankment projects such as slopes, roadbeds, foundations, and embankments under dry-wet cycle conditions; second, the shear strength of short fiber reinforced lime soil is extremely low, and cannot meet the requirements of embankments such as slopes, roadbeds, foundations, and embankments. Due to the anti-liquefaction requirements of the project, its service life is extremely short; the third is that the smoke and dust emissions in the production and use of lime materials will pollute the atmospheric environment, and the environmental protection performance is extremely poor

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