Three-dimensional base stability of rectangular excavations in soft soils using FEM U{i xok
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Abstract
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The three-dimensional base stability of rectangular excavations in soft soils was evaluated using the finite element method with :B{Wf 2<z
reduced shear strength. Numerical results indicate that the base stability of excavations was significantly influenced by the following SW5V:|/
factors: (1) the depth to width ratio, (2) the thickness of the soft soil layer between the excavation base and the hard stratum, (3) the 7]W6\Z
depth of walls inserted below the excavation base, (4) the stiffness of walls, and (5) the length to width ratio of the excavation. The 2 j.6
three-dimensional effect can be neglected at the length to width ratio larger than six. Terzaghi’s equation for base stability can be 5;'(^z-bL
used to evaluate the three-dimensional base stability of rectangular excavations after modification. :No`+X[Kq
2004 Elsevier Ltd. All rights reserved. VzfaUAIZl
Keywords: Finite-element analysis; Three-dimensional; Soft clay; Base stability
