Experimental Investigation on Influence of Acidic Dry-Wet Cycles on Karst Limestone Deterioration and Damage

Zhang, Yan; Wang, Zicheng; Su, Guoshao; Wu, Zhekang; Liu, Feng-Tao

doi:10.1155/2022/8562226

Cited by 4 publications

(5 citation statements)

References 32 publications

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“…The elastic volumetric strain was related to the elastic modulus (E) and Poisson's ratio (ν). The calculation formulas for the elastic volumetric strain (ε ev ) and crack volumetric strain (ε cv ) were as follows (Wang et al 2012(Wang et al , 2014Zhang et al 2022):…”

Section: Results Of the Triaxial Compression Testmentioning

confidence: 99%

“…During the dissolution of limestone samples in different pH solutions, the porosities undergo different changes. The lower the pH of the solution is, the faster the rate of change in the porosity and the greater the porosity resulting from the intense chemical reaction (Li et al 2018a;Zhang et al 2022). The pore scales gradually change from the nanoscale to the microscale with decreasing pH; the single pore area and perimeter increase and the fractal dimension decreases (Liu et al 2023a;.…”

Section: Introductionmentioning

confidence: 99%

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Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Ding,

Zuo,

2024

Geomech. Geophys. Geo-energ. Geo-resour.

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To explore the chemical and mechanical effects of acid mine drainage on water and rock, acid mine drainage (AMD) dissolution tests, triaxial compression tests, and acoustic emission tests were performed on limestone rock samples with different bedding dip angles. Combined with scanning electron microscopy and nuclear magnetic resonance analyses, the changes in the internal pores and surface morphologies of the rock samples before and after dissolution were analyzed. The results were as follows. (1) AMD dissolution mainly occurred in the shallow surfaces and bedding planes of the limestone samples. During dissolution, the shape of the matrix crystal disappeared to form small pores, and residual substances appeared during the dissolution of the bedding plane. These small pores were prone to the creation of large honeycomb-like dissolved pores. (2) With increasing bedding plane angle, the compressive strengths and elastic moduli of the limestone samples exhibited V-shaped distributions. Additional branch cracks were derived from the limestone samples after dissolution, and dissolution reduced the mechanical strength of the limestone by decreasing the crack initiation stress and damage stress. (3) With increasing bedding dip angle, the uniaxial failure modes of the rock samples changed from matrix tensile failure and shear failure along the bedding plane to plane tensile failure. After dissolution, the limestone matrix was prone to cracking and spalling along the surface of the sample. (4) There were differences in the triaxial compression failure modes between the dissolved limestone and the undissolved limestone. When α = 0° or 90°, the limestone samples formed additional branch fissures after dissolution. When α = 45°, the formation of penetrating cracks along the bedding plane was obviously controlled by the bedding plane. (5) A chemical–mechanical damage model was established and modified by the compression coefficient K, which could effectively reflect the deformation of the dissolved rock sample during loading.

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Section: Results Of the Triaxial Compression Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Ding,

Zuo,

2024

Geomech. Geophys. Geo-energ. Geo-resour.

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“…The water absorption characteristic of rocks is one of the most significant indicators for evaluating the physical qualities of rocks as they represent the degree of development of pore structure and microcracks in the rock. The water absorption of the limestone specimens is obtained from the following equation [23,24]:…”

Section: Water Absorption Characteristic Analysismentioning

confidence: 99%

Microscopic Response of Limestone Physical Deterioration under Water-Rock Alternation in the Acidic Environment

Liang

Luo

et al. 2022

Geofluids

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In order to investigate the microscopic response mechanism of limestone deterioration under alternating water-rock action in the acidic environment, the porosity, water absorption, mass loss characteristic, and microcrack propagation characteristic were analyzed by laboratory wetting-drying cyclic tests. The results show that, with increasing the number of cycles, the porosity, water absorption, and mass deterioration of the limestone specimens showed an overall increasing trend; moreover, at the beginning of the cycles, the physical deterioration of the specimen was significantly affected by the wetting-drying cycles, and at the end of the cycles, the physical deterioration of the specimen tended to be stable. The porosity deterioration degree reached 30.324% at the beginning of the cycles; there is a slight fluctuation in 20 cycles and then decreases as the number of cycles increases. The growth rate of water absorption increases slowly in 5~15 cycles and reaches the peak value in 20 cycles, and the growth rate decreases rapidly in the latter stages of the cycles. The increase rate of mass deterioration degree decreases with the increase of cycle number, the maximum average value can reach 61.887% at the beginning of cycles and is relatively stable at 20~25 cycles, and the average value at the end of cycle is obviously reduced by 3.167%. The nuclear magnetic resonance (NMR) test shows that the number and size of pores in the rock gradually increase with the increase of the number of wetting-drying cycles, and the wetting-drying cycles aggravate the internal damage of the rock. The number of shear cracks and fragmentation of the specimens increase as the increase of the number of cycles, and the failure of the specimens is mainly in the form of shear damage in the uniaxial compression test.

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“…(2) Influence of solution properties: The erosion degradation of limestone is mainly controlled by the chemical dissolution of the solution and the mass transfer process of major mineral ions, and the degree of erosion degradation of the rock mass increases with decreasing solution pH 9 – 22 . (3) Influence of wet-dry cycle effects: During the wet-dry cycle process, the degree of degradation in the macroscopic physical and mechanical properties of limestone increases with the number of cycles 23 – 25 . (4) Influence of rock properties: Based on the quantitative analysis of the main rock-forming minerals, the erosion reaction rate and mechanical energy degradation rate of different limestone properties are determined under the same solution environment 26 , 27 .…”

Section: Introductionmentioning

confidence: 99%

Study on the process of mass transfer and deterioration of limestone under dynamic dissolution of CO2 solution

Dong,

Li,

Shen

et al. 2024

Sci Rep

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The long-term erosion of rock by solution can induce a series of karst problems. Therefore, this study focused on limestone and conducted dynamic dissolution experiments under deionized water and CO2 solution conditions to study the deterioration mechanism of limestone under nonequilibrium conditions. The results showed that the degree of degradation of the mechanical properties of the samples in a CO2 solution was obviously greater. In a deionized water environment, the degradation of the mechanical properties of the sample is mainly controlled by the physical softening action of the solution. In the CO2 solution environment, the degradation process can be divided into two stages. In the early stage of the experiment (10 days to 20 days), the degradation of mechanical properties of the sample is also controlled by the physical softening action of the solution. With increasing soaking time, the main rock-forming minerals of limestone gradually react with the CO2 solution, the degradation of the sample is controlled mainly by the chemical corrosion of the CO2 solution, and its degradation rate is much greater than that of physical softening. The results can be used as a reference for assessing the long-term stability of underground engineering in limestone karst development areas.

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Experimental Investigation on Influence of Acidic Dry-Wet Cycles on Karst Limestone Deterioration and Damage

Cited by 4 publications

References 32 publications

Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Study on the mechanical and damage properties of laminated limestone under acid mine drainage dissolution

Microscopic Response of Limestone Physical Deterioration under Water-Rock Alternation in the Acidic Environment

Study on the process of mass transfer and deterioration of limestone under dynamic dissolution of CO2 solution

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