蜂巢格網加勁砂土力學行為之三向度分析

徐明弘

doi:10.6342/NTU.2014.00298

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蜂巢格網加勁砂土力學行為之三向度分析

Three-Dimensional Analysis of the Mechanical Behavior of Geocell-Reinfored Sand

徐明弘 , Masters　　Advisor：陳榮河　　

繁體中文 DOI： 10.6342/NTU.2014.00298

蜂巢格室；加勁；數值分析；異向性；三向度分析； geocell ； reinforcement ； numerical analysis ； anisotropy ； three-dimensional analysis

Abstract │ Reference (7) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Geosythetic-reinforced soil structures have been widely applied in geotechnical engineering. Among them, geocells are applied in enhancing bearing capacities of pavements and footings, reinforcing soft grounds and slopes, and so on. In the practice, the reinforced soil is often regarded as a composite material that is uniform and isotropic. In other words, the effect of the geometry of geocell is ignored, and the behavior of reinforced soil is assumed to be the same irrespective of loading directions. The main objective of this study was to analyze the anisotropic behavior of sand reinforced with geocell by using the finite element software PLAXIS. Verification of the numerical model was based on the results of triaxial compression test on geocell-reinforced-sand samples with appropriately selected material properties, boundary conditions, and strength parameters. 
In the numerical model, the geometry of the geocell was assumed to be composed of two bell-shaped curves. The aspect ratio of single cell was chosen 1.0, and therefore the dimension of a unit of reinforced sand was 0.2m x 0.2m x 0.2m. The unit was then subjected to compressive pressures from three mutually perpendicular directions (x-, y-, z-directions), and the mechanical behaviors of the reinforced sand were obtained accordingly. The deformations of the unit and the reinforcement, as well as the tensile stress distribution in the geocell were examined. To understand the practical applications, the number of unit was increased to form a reinforced layer in soft ground, which was subjected to vertical surcharges at the ground surface.

Reference ( 7 ) 〈TOP〉

(1) 王得安 (2013)。蜂巢格網圍束效應之數值分析。碩士論文，國立臺灣大學土木工程學研究所。
連結：
(2) 沈哲緯 (2005)。蜂巢格網加勁土壤之力學特性。碩士論文，國立臺灣大學土木工程學研究所。
連結：
(4) 黃渝紋 (2012)。三軸壓縮試驗探討蜂巢格網的圍束效應。碩士論文，國立臺灣大學土木工程學研究所。
連結：
(5) Chen, R. H., Huang, Y. W., Huang, F. C. (2013). Confinement effect of geocells on sand samples under triaxial compression. Geotextiles and Geomembranes, Vol. 37, pp. 35-44.
連結：
(6) Latha, G. M., Rajagopal, K. (2007). Parametric finite element analyses of geocell – supported embankments. Canadian Geotechnical Journal, Vol. 44, pp. 917-927.
連結：

Times Cited (1) 〈TOP〉

朱晟維(2016)。蜂巢格室擋土結構於土石流防護數值分析。臺灣大學土木工程學研究所學位論文。2016。1-116。

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