岩土力学2024，Vol.45Issue(8)：2290-2298,9.DOI:10.16285/j.rsm.2023.1354
不同固结路径下钙质砂固结排水强度性状研究
An experimental study on consolidated drainage strength of calcareous sand under anisotropic consolidation paths
摘要
Abstract
Calcareous sand is the primary fill material used in the construction of islands in the South China Sea.Throughout the process of island construction,the calcareous sand foundation will be subjected to external loads with varying consolidation stress paths,investigating the drainage strength characteristics of calcareous sand under various consolidation stress paths is an urgent requirement in practice.By conducting triaxial consolidation drainage shear tests on calcareous sand samples obtained from a reclamation island in the South China Sea,the evolution of strength parameters and the degree of particles breakage of calcareous sand with varying consolidation stress paths are investigated.The results show that the strain softening and dilation characteristics of calcareous sand diminish progressively as the mean effective stress and the effective principal stress ratio increase.In contrast to isotropic consolidation conditions,when the effective principal stress ratio diminishes to 0.45,the reduction coefficient of peak strength for the consolidated drainage of calcareous sand spans from 0.60 to 0.95.Within the conventional stress range,as the effective principal stress ratio increases,the peak internal friction angle shows a decreasing trend,ranging from 38° to 53°.During the consolidation,the degree of particles breakage increases with the increase of the deviator stress.However,following completion of shearing,the degree of particles breakage paradoxically diminishes,with particle breakage during the shearing phase assuming predominance.The quantitative relationship is verified between the peak internal friction angle and the relative breakage potential under different stress paths.Calculations predict peak internal friction angle values that are approximately 0.8 to 1.2 times the experimentally measured values.Differences in particle crushing caused by varying consolidation stress paths and consolidation pressures are the primary reasons for the differences in the consolidation drainage strength properties of calcareous sand after shearing.关键词
钙质砂/应力路径/固结排水强度/颗粒破碎/内摩擦角Key words
calcareous sand/stress path/consolidated drainage strength/particle breakage/internal friction angle分类
建筑与水利引用本文复制引用
陈军浩,张艳娥,王刚,王恒..不同固结路径下钙质砂固结排水强度性状研究[J].岩土力学,2024,45(8):2290-2298,9.基金项目
福建省自然科学基金(No.2022J01925,No.2022J05186) （No.2022J01925,No.2022J05186）
福建理工大学科研启动基金(No.GY-Z20093).This work was supported by the Fujian Province Natural Science Foundation of China(2022J01925,2022J05186)and the Scientific Research Starting Foundation of Fujian University of Technology(GY-Z20093) （No.GY-Z20093）
