Impact-induced fragmentation of coral reef limestone based on fractal theory

IF 1.6 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Marine Geophysical Research Pub Date : 2024-01-29 DOI:10.1007/s11001-023-09539-8

Yi Luo, Yueying Li, Hui Lin, Yongxiang Ge, Hangli Gong

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Abstract

The reef limestone specimens selected in this experiment can be divided into four types according to their morphologies: strongly-cemented compact-type (BM-type), weakly-cemented compact-type (M-type), weakly-cemented loose-type (BS-type), and strongly-cemented loose-type (S-type). Based on the split Hopkinson pressure bar (SHPB) test, the aims of this study were to investigate the dynamic mechanical response and energy dissipation characteristics of reef limestone under impact loads and discuss the relationships of the dynamic fragmentation fractal characteristics with the strain rate and energy dissipation of reef limestone. The results indicated that the length of the compaction section for compact-type reef limestone compared with that of the loose section, which is more significant in the case of decreasing strain rate. The fractal dimension is linearly positively correlated with the strain rate; the fractal dimension of compact-type reef limestone is lower than that of loose-type reef limestone; meanwhile, the dynamic fractal dimension of compact-type reef limestone is more sensitive to the strain rate. The fragmentation fractal dimension of reef limestone under impact loads shows exponential growth with the increase in dynamic strength. The fragmentation fractal dimension of reef limestone is linearly, and positively, correlated with energy dissipation density.

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基于分形理论的撞击诱发的珊瑚礁石灰岩碎裂

本实验所选取的岩礁灰岩试样按形态可分为四种类型：强胶结致密型（BM 型）、弱胶结致密型（M 型）、弱胶结疏松型（BS 型）和强胶结疏松型（S 型）。本研究以霍普金森压力棒（SHPB）劈裂试验为基础，研究冲击载荷作用下岩礁灰岩的动态力学响应和能量耗散特征，探讨岩礁灰岩动态碎裂分形特征与应变速率和能量耗散的关系。结果表明，与松散段相比，密实型礁灰岩的压实段长度在应变速率减小的情况下更为显著。分形维数与应变率呈线性正相关，密实型暗礁灰岩的分形维数低于松散型暗礁灰岩，同时密实型暗礁灰岩的动态分形维数对应变率更为敏感。在冲击载荷作用下，碎裂分形维数随动强度的增加呈指数增长。礁灰岩的碎裂分形维数与能量耗散密度呈线性正相关。

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来源期刊

Marine Geophysical Research 地学-地球化学与地球物理

CiteScore

2.80

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： Well-established international journal presenting marine geophysical experiments on the geology of continental margins, deep ocean basins and the global mid-ocean ridge system. The journal publishes the state-of-the-art in marine geophysical research including innovative geophysical data analysis, new deep sea floor imaging techniques and tools for measuring rock and sediment properties. Marine Geophysical Research reaches a large and growing community of readers worldwide. Rooted on early international interests in researching the global mid-ocean ridge system, its focus has expanded to include studies of continental margin tectonics, sediment deposition processes and resulting geohazards as well as their structure and stratigraphic record. The editors of MGR predict a rising rate of advances and development in this sphere in coming years, reflecting the diversity and complexity of marine geological processes.