Numerical Modeling of Granular Soil Stabilized Using Biological Approach in Road Substrate

مهندسی عمران فردوسی

Article 8, Volume 30, Issue 2 - Serial Number 18, May 2017, Pages 109-118   

Document Type: Research Note

DOI: 10.22067/civil.v30i2.31051

Authors

vahid nezami^{* 1}; saeid kharaghani¹; nima mehrannia²

¹Shahid Beheshti University

²Islamic Azad University, Science and Research Branch, Tehran

Abstract

Biological method is an unusual way for soil stabilization in civil engineering, particularly in the sectors of road. Microbial limestone deposits occur due to urea hydrolysis by an enzyme called urease. Through this reaction, PH of the soil increases and Crystals of limestone deposit between soil particles and reduce the permeability of soil. In this study, by using experimental results at the National Institute for Genetic Engineering and Biotechnology, a road improved sandy bed is modeled by biological methods. ABAQUS 6.11 in this study is used. The soil layer is modeled in elasto-plastic condition and Settlement is calculated by using elasto plastic model in various thicknesses. The results show a significant effect in reducing plastic deformation and increasing soil strength by using biological methods in soil improvement.

Keywords

Granular Soils; Biological Soil Improvement; Limestone; Numerical Modeling,; The Behavior of Elasto Plastic

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