Influence of Chemical Corrosion on Pore Structure and Mechanical Properties of Sandstone

Lin, Yun; Zhou, Keping; Gao, Rugao; Li, Jielin; Jian, Zhang

doi:10.1155/2019/7320536

Cited by 22 publications

(15 citation statements)

References 51 publications

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“…What is more, the transverse relaxing time corresponding to the peak shifts to the left, and the difference between the peak and trough narrowed crucially, suggesting that the size and number of large pores in the rock samples both reduced while homogeneity of the rock samples is improved. In order to more accurately analyse the variation law of pore distribution inside the rock samples after the test, pores with a transverse relaxation time of less than 10 ms are considered as small ones, those between 10 and 100 ms are medium ones, and over 100 ms are large ones by referring to the practices of Lin [27] and Zhou [28]. Combined with the T2 spectrum distribution curves in figure 16, the spectral areas corresponding to each type of pores are calculated, the proportions of which are as shown in figure 17.…”

Section: Mechanism Of Microbial-induced Carbonate Precipitation Repaimentioning

confidence: 99%

Experimental study on repair of fractured rock mass by microbial induction technology

2019

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The surrounding rock mass is often required to have good strength and impermeability in underground engineering. Some grouting methods, such as the chemical grouting method and the cement grouting pressure pump method, are often applied to reform underground environment and improve the engineering performance of rock mass. However, the application of some traditional grouting materials would destroy the original environment in which the project is located. This paper focuses on the repairing effect of Bacillus pasteurii composites in fractured rocks. The repairing effect of microbial materials on fractured sandstone is analysed through nuclear magnetic resonance (NMR) and unconfined compression-shearing equipment. The result shows that the longer the repairing time is, the better the effect will be. After 42 days of repairing, the porosity of fractured sandstone decreases by 36.41%, the impermeability increases by 94.62%, and the compressive strength increases by 30.52%. Through the study of reaction mechanisms, this technology has the advantages of mild reaction conditions, no pollution and good environmental compatibility. The application of this technology to the maintenance of geotechnical engineering can provide new ideas for the research and development of new environmental grouting materials and underground space reconstruction technology.

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Section: Mechanism Of Microbial-induced Carbonate Precipitation Repaimentioning

confidence: 99%

Experimental study on repair of fractured rock mass by microbial induction technology

2019

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“…Natural rocks have a large number of irregular pore structures that occur at multiple scales [1,2]. Water is an active component of the geological environment that has an important influence on the safety of rock mass engineering [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…In order to comprehensively study the macromechanical damage caused by chemical erosion of rocks, many experimental studies have been conducted. Lin et al [2] investigated the effects of chemical erosion due to solution soaking on the pore structure and mechanical properties of sandstones by analyzing porosity, T 2 spectrum distributions, and nuclear magnetic resonance images (NMRI). Han et al [1,8] used damage variables based on pore variation to quantitatively analyze sandstone damage caused by chemical erosion.…”

Section: Introductionmentioning

confidence: 99%

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NMR Experimental Study on Dynamic Process of Pore Structure and Damage Mechanism of Sandstones with Different Grain Sizes under Acid Erosion

Wang

et al. 2020

Shock and Vibration

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In many engineering projects, it is critical to consider the acid erosion of rock. This study investigates dynamic changes in pore structure and damage mechanisms in sandstones subjected to acid erosion. Specimens with three grain sizes were immersed in acid solution and tested by the nuclear magnetic resonance technique. Changes in solution pH, specimen mass and porosity, T2 spectrum distribution, and area were analyzed. Damage mechanisms are discussed, and relationships between porosity and acid erosion damage variables are established. The results show that acid erosion has significant effects on pore structure and erosion damage in sandstone. With increasing soaking time, new micropores formed in sandstone, while existing micropores and mesopores gradually expanded into macropores, causing the T2 spectrum distributions to change greatly. The porosity, acid erosion damage, and T2 spectral areas of sandstones with different grain sizes all increased gradually. Under acid erosion, sandstones became gradually weakened, but the effects varied greatly according to grain size. Pore structure changes and acid erosion damage were greatest in coarse-grained sandstone, followed by medium- and fine-grained sandstone.

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“…Recently, understanding dynamic tensile properties of rocks under special conditions has aroused great concerns, such as rocks after heat treatment, rocks eroded by chemical substances, and rocks cyclic loading and unloading. is also includes investigating dynamic tensile properties of rocks with different water contents [24][25][26][27][28]. Zhou et al [29] carried out Brazilian disc tests on saturated sandstones with the SHPB system and concluded that tensile strength of the sandstone specimen decreases with a higher water content.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Tensile Failure of Sandstone Specimens with Different Water Contents

Lin

Zhou

et al. 2019

Shock and Vibration

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Understanding the effect of water saturation on dynamic failure of rocks is of great importance to tunnel excavation at water-rich coal mines and prevention of rock bursts by water injection. Dynamic Brazilian disc tests are performed to study mechanical behaviour of sandstones in this paper. The results indicate that water saturation significantly weakens the dynamic tensile strength of sandstones and increases the specimen strain at which the specimen fails. The damage degree of sandstones reduces gradually with increasing water contents. Failure of the sandstone specimen includes the crack initiation at the center of the specimen, macroscopic crack propagation, and stretch of the macroscopic crack through the specimen. In addition, parallel macroscopic crack propagation is found in the specimen with a low water content. From the observation of fracture sections, microstructures are compact in the specimen with high water contents. This is due to the swell of the kaolinite in the specimen after water saturation. The failure mechanism of microstructures is typical brittle failure in the specimen with a high water content, whereas ductile fracture is found in the specimen with a low water content. Different failure processes of microstructures lead to the differences between mechanical properties and macroscopic failure characteristics of the specimens with various water contents.

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Influence of Chemical Corrosion on Pore Structure and Mechanical Properties of Sandstone

Cited by 22 publications

References 51 publications

Experimental study on repair of fractured rock mass by microbial induction technology

Experimental study on repair of fractured rock mass by microbial induction technology

NMR Experimental Study on Dynamic Process of Pore Structure and Damage Mechanism of Sandstones with Different Grain Sizes under Acid Erosion

Experimental Study on Dynamic Tensile Failure of Sandstone Specimens with Different Water Contents

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