학술논문
未胶结钙质砂中表面基础承载力研究 / Bearing Capacity of Surface Footing in Uncemented Calcareous Sand
Document Type
Academic Journal
Author
张永涛; 王晓丽; 陈培帅; 罗会武; 王栋; 裴会敏; Zhang Yongtao; Wang Xiaoli; Chen Peishuai; Luo Huiwu; Wang Dong; Pei Huimin
Source
中国海洋大学学报（自然科学版） / Periodical of Ocean University of China. 54(2):114-120
Subject
Language
Chinese
ISSN
1672-5174
Abstract
本文针对南海未胶结钙质砂开展室内表面基础模型试验、大变形有限元模拟和三轴排水试验,获得钙质砂承载特性与力学性质.通过进行室内模型试验,获得松砂和中密砂中反力-位移曲线,且发现基础周围颗粒破碎不明显.然后采用商业软件Abaqus中的大变形有限元模块耦合欧拉-拉格朗日(CEL)开展表面基础有限元计算,本构模型采用摩尔-库伦模型,本构参数通过三轴排水试验确定.有限元模型经室内模型试验结果验证可靠后,开展变参计算,探究基础尺寸和土体相对密实度对表面基础承载力的影响.结果表明,表面基础承载力随基础直径增加而增大,满足幂函数变化规律,进而给出了容许承载力和极限承载力随基础直径变化的预测公式.
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.
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.