硅酸盐通报2024，Vol.43Issue(11)：3976-3985,10.
不同龄期与灰砂比胶结充填体力学损伤特性及断口形貌分形特征研究
Mechanical Damage Characteristics and Fracture Morphology Fractal Characteristics of Cemented Filling Body at Different Ages and Cement/Sand Ratios
摘要
Abstract
In order to investigate the influences of age and cement/sand ratio on the mechanical damage characteristics and fractal characteristics of damage fracture morphology of filling body,as well as the relationship between mechanical damage characteristics of filling body and fractal characteristics of fracture morphology,five types of cement/sand ratio cemented filling body samples were prepared using a certain metal ore tailings.Porosity,acoustic wave velocity tests,uniaxial compression and damage fracture morphology scanning tests were carried out on samples at four curing ages.Based on the principle of strain equivalence,the damage evolution equation of filling body was constructed to characterize the damage characteristics of filling body.The"small island method"was used to calculate the fractal dimension of fracture morphology and quantitatively characterize its fractal characteristics.The results show that the uniaxial compressive strength and elastic modulus of filling body increase exponentially with age,increase with the increase of cement/sand ratio,and show an exponential decreasing relationship with the fractal dimension of fracture morphology.The damage evolution process of filling body can be divided into three stages:initial damage,accelerated damage growth,and damage failure.The fractal dimension of fracture morphology of filling body decreases exponentially with age,and decreases with the increase of cement/sand ratio.The effect of age on fractal dimension of filling body with a larger cement/sand ratio is more significant.There is a linear negative correlation between damage value at peak stress of filling body and fractal dimension of damage fracture morphology.关键词
胶结充填体/养护龄期/灰砂比/力学特性/损伤特性/分形特征/断口形貌Key words
cemented filling body/curing age/cement/sand ratio/mechanical characteristics/damage characteristics/fractal characteristics/fracture morphology分类
矿业与冶金引用本文复制引用
张贺,刘艳章,黄诗冰,胡谱达,夏永西,曹文耀,苏旭..不同龄期与灰砂比胶结充填体力学损伤特性及断口形貌分形特征研究[J].硅酸盐通报,2024,43(11):3976-3985,10.基金项目
国家自然科学基金面上项目(42377191) （42377191）
