Investigation of damage characteristics of coral reef limestone under uniaxial compression based on pore structure

Wu, Kai; Meng, Qingshan; Wang, Chi; Qin, Qinglong

doi:10.1016/j.enggeo.2022.106976

Cited by 19 publications

(2 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This analysis revealed that the failure mode of the sample was influenced by the pore IOP Publishing doi:10.1088/1755-1315/1332/1/012026 2 structure and cemented skeleton and that the distribution of pores had an impact on the final failure mode. Wu et al [4] analyzed the uniaxial compression behavior and pore structure characteristics of four different structural types of coral reef limestone. This study revealed significant variations in terms of uniaxial compressive strength (UCS), deformation characteristics, elastic modulus, and failure modes among the coral reef limestone samples with distinct structures.…”

Section: Introductionmentioning

confidence: 99%

Pore structure characteristics of coral reef limestone: a combined polarizing microscope and CT scanning study

Xu,

Huang,

Zhang

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Coral reef limestone is a special class of geological medium formed through long-term deposition following the death of reef-building coral groups. Because it retains the skeletal structure of marine organisms during its formation, its pore structure is hyper-developed and complex. Deciphering the pore structure of the coral reef limestone is important because it is closely related to its macroscopic physical and mechanical properties. This study conducted a comprehensive analysis of the pore structure features of two types of coral reef limestone collected from the construction site of a nuclear power station located in the South China Sea using a combination of polarizing microscopy and CT scanning technologies. The fractal dimension of the pore structure of the treated reef limestone image was calculated, and the pore structure characteristics were statistically analyzed by considering several parameters including porosity, pore size, pore equivalent radius, shape factor, etc. In addition, the directional feature of the pore structure was explored. The results show that the improved watershed segmentation algorithm can accurately segment the pore structure of reef limestone images; both coral reef limestone specimens are loose of high porosity; the fractal dimension of pore structure lay between 1.58∼1.75, indicative of a high self-similarity; the pore size of the two coral reef limestone specimens is quite different, and the distribution of equivalent pore radius conforms to the normal distribution law; the pore structure of the two samples had obvious directionality, which can be quantified using a directional tensor. This study sheds light on future investigations linking the microscopic structure and macroscopic properties of coral reef limestones.

show abstract

Section: Introductionmentioning

confidence: 99%

Pore structure characteristics of coral reef limestone: a combined polarizing microscope and CT scanning study

Xu,

Huang,

Zhang

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

“…Moreover, Liu et al [17] applied the lateral strain response method (LSR) method to the triaxial compression test and found that under a confining pressure of 0-8 MPa, the crack initiation stress of the specimen is estimated to be 52-69% of the peak compressive strength. Wu et al [18][19][20] performed a series of laboratory tests to perform in situ scanning of specimens under different stress states with regard to understanding the damage evolution characteristics, microscopic mechanism of crack propagation, and quality evaluation of CRL under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research into the Uniaxial Compressive Strength of Low-Density Reef Limestone Based on Image Recognition

et al. 2023

View full text Add to dashboard Cite

Low-density reef limestone is widely distributed in tropical oceans; exploring its mechanical properties is of significance to practices in marine foundation engineering. In this research, laboratory experiments on low-density reef limestones with two different types of porous structures were conducted using image recognition methods to study the special mechanical properties of low-reef limestone. S¯ was defined as the parameter quantifying the pore geometry, and the calculation method of S¯ was optimized based on image recognition data. Finally, the influencing factors of uniaxial compressive strength (UCS) of low-density reef limestone were analyzed, and a modified formula considering pore structure was proposed. The results indicate the following: Image recognition methods were used to determine feasibility and convenience of capturing 2D pore geometric information of specimens. The optimization method of S¯ is conducive to improving automatic image recognition accuracy. Low-density reef limestones with different porous structures show small difference in porosity and density, while they exhibit large differences in pore sizes and UCS. The UCS of low-density reef limestone is found to be jointly influenced by pore structure and density (it increases with the decrease in parameter S¯ and increase in density). The results may provide help for those investigating the mechanical properties of reef limestone and practices in marine foundation engineering.

show abstract

Introduction

Zhao,

Zheng,

Wang

2024

Rock Fracture Mechanics and Fracture Criteria

View full text Add to dashboard Cite

show abstract

Investigation of damage characteristics of coral reef limestone under uniaxial compression based on pore structure

Cited by 19 publications

References 32 publications

Pore structure characteristics of coral reef limestone: a combined polarizing microscope and CT scanning study

Pore structure characteristics of coral reef limestone: a combined polarizing microscope and CT scanning study

Experimental Research into the Uniaxial Compressive Strength of Low-Density Reef Limestone Based on Image Recognition

Introduction

Contact Info

Product

Resources

About