ANALYSIS OF BASAL HEAVE STABILITY FOR EXCAVATIONS IN SOFT CLAY USING THE FINITE ELEMENT METHOD

  • Aswin Lim Parahyangan Catholic University, Bandung, Indonesia
  • Chang- Yu Ou National Taiwan University of Science and Technology, Taipei, Taiwan

Abstract

In recent years, finite element calculation can be done easily with computer software as tools. In geotechnical field, many conventional equations and approaches are becoming obsolete, because users must simplify the problems with some assumptions. Likewise basal heave stability analysis in deep excavation, conventional methods (limit equilibrium methods) such as Terzaghi’s bearing capacity method, Bjeerum and Eide’s method and Slip Circle method have a lot of assumptions especially in determining the failure surface. As it has been known, finite element calculation can yield good result in deformation problem. As matter of fact, stability problem is a kind of deformation also. The main purpose of this study is to obtain factor of safety against basal heave in deep excavation using finite element method. Two total stress undrained soil models namely Mohr Coulomb (f=0) model and Undrained Soft Clay model were used for simulating the excavation cases. These two models have been validated by simulating Taiwan National Enterprise Centre excavation case which have well documented data and soil properties. In addition, two failure excavation cases are included for developing reasonable method in obtaining the value of factor of safety. Method A is developed based on shear strength reduction method, whereas method B is modification of method A where wall bottom movement and soil bottom heaving behavior take into consideration for obtaining the factor of safety. Both methods can yields reasonable factor of safety depends on soil constitutive models that is used. Based on analyses results, method A is more compatible with Undrained Soft Clay model, whereas method B is more compatible with Mohr Coulomb (f=0) model.

Published
2011-08-01
How to Cite
LIM, Aswin; YU OU, Chang-. ANALYSIS OF BASAL HEAVE STABILITY FOR EXCAVATIONS IN SOFT CLAY USING THE FINITE ELEMENT METHOD. EACEF - International Conference of Civil Engineering, [S.l.], v. 1, p. 012, aug. 2011. Available at: <http://proceeding.eacef.com/ojs/index.php/EACEF/article/view/315>. Date accessed: 19 may 2024.
Section
Group of Geotechnical Engineering