未胶结钙质砂中表面基础承载力研究OACSTPCD

The capacity and deformation behaviors of calcareous sand are distinguished from silica sand due to their fundamental differences on the shape,mineral of soil particles and inner pore.A series of plate loading tests,large deformation finite element simulations and drained triaxial tests were conduc-ted on the uncemented calcareous sand in South China Sea to obtain the bearing and mechanical proper-ties.The stress-settlement curves were obtained by the plate loading tests,which found that the particle breakage around the surface footing was negligible.The Abaqus finite element package utilizing the Cou-pled Eulerian-Lagrangian method was used to simulate the footing load tests and the Mohr-Coulomb model was incorporated to describe the behavior of calcareous sand.Drained triaxial tests were used to determine the parameters of the constitutive model.The numerical model was verified by the plate load-ing test to be reliable and then the effects of the relative density and footing diameter on footing capacity were investigated by varying parameters tests.The result shows that the bearing capacities were in-creased with the increase of footing diameter in the form of a power function.The predicted formulas of allowable bearing capacity and ultimate bearing capacity varying with footing diameter were summa-rized.