桂林理工大学学报2025，Vol.45Issue(2)：199-205,7.DOI:10.3969/j.issn.1674-9057.2025.02.007
三轴循环荷载下珊瑚砾块灰岩力学特性试验
Mechanical properties of coral boulder limestone under triaxial cyclic loading
摘要
Abstract
In order to explore the mechanical properties of coral boulder limestone under cyclic loading,this pa-per uses the electro-hydraulic servo triaxial test system(MTS 815.03)to conduct triaxial compressive strength test and triaxial constant cyclic load test on coral boulder limestone under different confining pressures.The stress-strain curves of coral boulder limestone samples are analyzed from the aspects of morphology,strength characteris-tics and failure mode.The test results show that the stress-strain curves of coral boulder limestone samples show obvious hysteretic effect during triaxial cyclic loading test.The triaxial peak strength of reef limestone under cyclic loading is higher than that of triaxial compressive strength,and the peak strength of coral boulder limestone in-creases obviously with the increase of confining pressure and loading frequency.Coral boulder limestone keeps high residual strength after failure under triaxial and cyclic loading.The strength of coral boulder limestone con-forms to Mohr-Coulomb strength criterion.Under cyclic loading,coral boulder limestone presents a complex split-shear failure mode.With the increase of confining pressure and loading frequency,the failure mode of coral boul-der limestone gradually changes from split-shear failure mode to single-inclined shear failure mode,and most of the failure cracks occur along the parts with poor biological component cementation and more through pores.The results are helpful to improve the understanding of mechanical properties and damage characteristics of coral boul-der limestone,and provide important reference for strength design and construction of coral reef engineering.关键词
珊瑚砾块灰岩/三轴循环荷载/加载频率/围压/岩石力学Key words
coral boulder limestone/triaxial cyclic load/loading frequency/confining pressure/rock mechanics分类
建筑与水利引用本文复制引用
蒋雪,孟庆山,王志兵,李浩明..三轴循环荷载下珊瑚砾块灰岩力学特性试验[J].桂林理工大学学报,2025,45(2):199-205,7.基金项目
国家自然科学基金面上项目(41877267 （）
41772336) （）
中国科学院战略性先导科技专项(A类)(XDA13010201) （A类）
