纖維泡沫顆粒輕質(zhì)土力學(xué)性質(zhì)試驗(yàn)研究
[Abstract]:Foamed granular lightweight soil is a lightweight filling material composed of EPS (Expanded Polystyrene) foam particles, curing agent and raw soil. Compared with general soil, this material has the advantages of low density, good standing, durability, economy, environmental protection, and so on, so it has a wide application prospect. In order to improve the properties of lightweight soil, fiber was added to form fiber foam particle lightweight mixed soil (hereinafter referred to as lightweight soil). In this paper, the density, deformation and strength characteristics of light soil are studied by means of density test, unconfined compressive strength test, direct shear test and so on, which provide reference for engineering application. The specific research contents are as follows: (1) the density characteristics of lightweight soils with different ratios are obtained by density test. The EPS particle ratio and EPS particle size are the main factors affecting the density, and with the increase of EPS particle incorporation ratio and particle size, The density of light soil is decreased, and the influence of cement content and fiber length on the density of light soil is not obvious. (2) the deformation characteristics of light soil with different ratio. Through the unconfined compressive strength test and the direct shear test, the stress-strain law and shear stress shear displacement change law of light soil with different proportions are analyzed. By fitting the stress-strain curve of unconfined compressive strength, the variation of deformation modulus of unconfined compressive strength is studied, and the relationship between deformation modulus and compressive strength is obtained. (3) in unconfined compressive strength, The unconfined compressive strength decreases with the increase of the ratio and particle size of EPS particles. With the increase of cement content, the unconfined compressive strength increases. With the increase of fiber length, the unconfined compressive strength increases gradually, and the integrity of lightweight soil increases. (4) in the direct shear test, the shear strength and cohesion decrease with the increase of EPS ratio and particle size. With the increase of cement content, the shear strength and cohesion of lightweight soil increase. The length of the fiber increased from 9mm to 12 mm, and the shear strength increased by 40 mm. The results show that the shear strength of light soil can be improved significantly when the fiber length reaches to 12mm. (5) the unconfined compression failure mode of light soil: the light soil with EPS diameter of 0.5~1mm forms about 45 擄crack and presents brittle failure. The light soil with EPS diameter of 2~3mm formed more than 45 擄crack, and the light soil with EPS diameter of 3~5mm appeared bulging failure. Direct shear failure pattern: the shear surface of specimen is obvious, the shear plane with smaller EPS particle size is flat, and the shear plane with larger particle size is relatively loose; with the addition of fiber, the specimen is cracked and the whole soil is improved.
【學(xué)位授予單位】:湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU41
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