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

摘要/Abstract

摘要： 为探究龄期与灰砂比对充填体力学损伤特性及破坏断口形貌分形特征的影响,以及充填体力学损伤特性与断口形貌分形特征的关系,采用某金属矿全尾砂制备5种灰砂比胶结充填体试样,对4种养护龄期下的试样开展孔隙率测试、声波波速测试、单轴压缩及破坏断口形貌扫描试验;基于应变等价原理构建充填体损伤演化方程,表征充填体损伤特性,采用“小岛法”计算断口形貌分形维数,量化表征分形特征。结果表明:充填体单轴抗压强度与弹性模量随龄期延长呈指数型增长,随灰砂比增加而增大,与断口形貌分形维数呈指数型递减关系;充填体的损伤演化过程分为初步损伤、损伤加速增长和损伤破坏三个阶段;充填体破坏断口形貌分形维数随龄期延长呈指数型减小,随灰砂比增大而减小,龄期对灰砂比越大的充填体的分形维数影响效果越显著;充填体峰值应力处损伤值与断口形貌分形维数呈线性负相关关系。

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

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.

Key words: cemented filling body, curing age, cement/sand ratio, mechanical characteristics, damage characteristics, fractal characteristics, fracture morphology

中图分类号:

TD853

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.

ZHANG He, LIU Yanzhang, HUANG Shibing, HU Puda, XIA Yongxi, CAO Wenyao, SU Xu. Mechanical Damage Characteristics and Fracture Morphology Fractal Characteristics of Cemented Filling Body at Different Ages and Cement/Sand Ratios[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 3976-3985.

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