Upper-bound solution for seismic bearing capacity of shallow foundations near slopes

Géotechnique ◽  
2003 ◽  
Vol 53 (8) ◽  
pp. 697-702 ◽  
Author(s):  
F. Askari ◽  
O. Farzaneh
Keyword(s):  
Bearing Capacity ◽  
Upper Bound ◽  
Shallow Foundations ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Seismic Bearing Capacity

Failure Mechanism and Bearing Capacity of Shallow Foundation on Poorly Cemented Sandstone

2008 ◽  
Vol 24 (3) ◽  
pp. 285-296 ◽  
Author(s):  
J.-C. Chang ◽  
J.-J. Liao ◽  
Y.-W. Pan
Keyword(s):  
Bearing Capacity ◽  
Failure Mechanism ◽  
Upper Bound ◽  
Hard Rock ◽  
Model Tests ◽  
Shallow Foundation ◽  
Load Bearing ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Bearing Behavior

AbstractThis paper aims to investigate the failure mechanism of a shallow foundation on poorly cemented sandstone and to propose an upper bound solution for the bearing capacity of the foundation. A series of laboratory material and load-bearing model tests with specimens made of artificial rock mimic undisturbed natural poorly cemented sandstone.Based on a series of load-bearing model tests, bearing behavior and progressive failure mechanisms are investigated. It was found that the bearing behavior on poorly cemented sandstone is distinct from the cases on hard rock or on soil, and exhibits both plasticity and brittle characteristics. It is noted that the bearing capacity formulas for a shallow foundation commonly used for soil or hard rock are not appropriate for the case of poorly cemented soft sandstone. Based on the observed failure mechanism, a simplified plastic collapse mechanism is proposed and an upper-bound solution on the basis of a multi-block translation mechanism is formulated. It is shown that the upper bound solution agrees well with the experimental bearing capacity as long as a proper non-associated flow rule is adopted.

Upper Bound Solution for Ultimate Bearing Capacity of Foundation Based on Unified Strength Theory

2012 ◽  
Vol 446-449 ◽  
pp. 1751-1754
Author(s):  
Yao Tang ◽  
Ping Tang
Keyword(s):  
Bearing Capacity ◽  
Upper Bound ◽  
Strength Theory ◽  
Unified Strength Theory ◽  
Positive Effects ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Potential Capacity ◽  
Special Cases ◽  
Foundation Base

Based on unified strength theory, an upper bound solution for bearing capacity of foundation is established considering the strength of soil above the basement by using Prandtl slip model. The proposed method could be degenerated to classical slip-line method in some certain situations. A series of results could be presented by means of changing the parameters of unified strength theory. The results obtained by this proposed method are greater than those by Terzaghi method, which is mainly because the positive effects of soil strength above foundation base. Since unified strength theory could be simplified to Mohr-Coulomb strength theory in a certain situation, the results are close to those obtained by Meyerhof method. This proposed solution can consider the effects of intermediate principal stress so that we can make full use of the potential capacity of soil, which is a rigorous upper-bound solution. Other solutions are special cases of this proposed solution.

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