Comparative Analyses Concerning Triaxial Compressive Yield Criteria of Coal with the Presence of Pore Water

Liu, Rulin; Yu, Yanbin; Cheng, Weimin; Xu, Qingfeng; Yang, Haotian; Shen, Jialong

doi:10.1155/2020/4670812

Cited by 8 publications

(4 citation statements)

References 26 publications

(29 reference statements)

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“…A large number of scholars have conducted relevant research through laboratory experiments and field tests. Liu et al found through laboratory experiments that retention in coal body would clog the pore and reduce the permeability. Li , et al found that guar gum would alter the pore and further affect the permeability by chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slickwater on Methane Adsorption in Coal: Experiment and Molecular Simulation

Li,

Wang,

Ning

et al. 2024

Energy Fuels

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Slickwater is generally applied in the domain of coalbed methane (CBM) stimulation. However, the residual slickwater after fracturing operations may adversely affect the production of CBM. In this paper, nuclear magnetic resonance (NMR) measurements are used to compare and analyze the differences of functional groups on the coal surface in different regions and provide the basis for the construction of molecular simulation models. Then, different concentrations of slickwater were made, and coal samples from different regions were soaked. Isothermal adsorption experiments and molecular simulations were applied to explore the effect of slickwater on methane adsorption properties of coal from different regions. The NMR results show that the amount of naphthalene functional groups in coal samples from Dongtan coal mine (DT) is more than that in coal samples from Houwenjialiang coal mine (HW), which has a stronger attraction to methane. The isothermal adsorption experiment results show that the methane adsorption capacity of the coal sample from HW is stronger than that of the coal sample from DT. When the concentration of slickwater is 0.5%, the methane adsorption capacity of DT increases to 3/2 of raw coal, and the methane adsorption capacity of HW declines to 1/3 of raw coal. The retention of slickwater will have different effects on coal samples in different areas. Comparing the experimental and simulation results, we can see that polyacrylamide can adsorb methane, thereby increasing the specific surface area of the local “slickwater–coal” system due to its porous coating structure, resulting in an increase in the methane adsorption capacity. The negative effect of slickwater on the methane adsorption properties is because slickwater changes the pore, resulting in the reduction of effective surface area and finally damages the adsorption amount of methane.

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Section: Introductionmentioning

confidence: 99%

Effect of Slickwater on Methane Adsorption in Coal: Experiment and Molecular Simulation

Li,

Wang,

Ning

et al. 2024

Energy Fuels

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“…The space formed by these pores and fractures is the only space for storing and transporting coalbed methane in the coal seam . The development of pores and fractures caused by mining disturbance plays an important role in the migration and development of coalbed methane; understanding the mechanical behavior of jointed rock masses is important for their structural analysis. , Therefore, the pore and fracture structure of coal have always been the focus of research in the field of coalbed methane and coal mine safety . Detecting the evolution process of the microstructure of the coal fractures and pores under the action of in situ stress and understanding the spatial distribution of changes in the coal fractures and pore microstructures have a theoretical research value and practical engineering significance to recognize the fracture propagation and distribution in the process of coal destruction. − …”

Section: Introductionmentioning

confidence: 99%

Porosity and Fracture Changes of Coal under Uniaxial Strain Conditions Based on the X-ray Microscopic Imaging Technology

Cheng

et al. 2021

Energy Fuels

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Coal is an important energy fuel, and safe mining of coal is of great significance to economic stability. The mechanical properties of coal are very important to prevent the pores and fractures caused by mining and for the stability of the mine, as well as the coal and gas explosion disasters caused by mining failures. The macroscopic fractures are generated from a mesoscopic state. In this research work, a NanoVoxel-3502E X-ray three-dimensional microscope and the Deben in situ loading technology were used to carry out the uniaxial compression testing of coal and also to obtain the CT data under different strain conditions. The data were combined using three-dimensional visualization software AVIZO to extract the pore and fracture distribution characteristics of the coal sample and to analyze the evolution of the microstructure of the sample under the influence of axial stress. According to the obtained results, small fractures appeared in large numbers when the axial force increased from 20 to 732 N, and the fractures became narrow and long at 431−732 N. At 732 N, the average value of the throat equivalent radius and the average value of the throat area were the largest. When the axial force reached the peak, a complex fracture network was formed, while the volume and area of the fracture increased at the fastest rate; most of the isolated pores disappeared after the peak.

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“…The main factors that affect the physical and mechanical properties of similar materials are the selection of raw materials (aggregate, cementitious material), proportion, density, moisture content, etc [39][40][41][42][43][44]. However, the research focus is on the selection of raw materials and their proportion, while there are few studies on the effect of the moisture content on the mechanical properties of similar materials [45][46][47][48]. Liu Shiliang et al [49] developed new similar materials that satisfy the requirements of fluid-solid coupling using river sand, calcium carbonate, talc, white cement, petroleum jelly and anti-wear hydraulic oil as raw materials; they tested the mechanical properties of the samples and applied the research results to the physical model test of water inrush from the coal floor.…”

Section: Introductionmentioning

confidence: 99%

Experimental development process of similar material of water resisting layer in physical model test

et al. 2021

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The stability evaluation of water resisting layer in the process of coal mining is the key to study the law of water and soil loss and prevent the loss of water resources. The development and proportioning of similar materials are the basis to study the stability of water resisting layer by physical simulation. A new type of similar material considering water characteristics was developed through orthogonal experiments. The similar material was composed of river sand, bentonite, silicone oil, vaseline, and water. Determine the best test development process. First of all, the proportion test scheme is designed based on the orthogonal test. Then, the influence of cement concentration, mass ratio of silicone oil to vaseline and other components on the density, uniaxial compressive strength, elastic model and Poisson’s ratio of similar materials was analyzed by range analysis. Finally, the multiple linear regression equation between the parameters and the composition of similar materials for water resisting layer is obtained, and the optimal composition ratio is further determined according to the relationship between the test influencing factors and the mechanical properties of similar materials. The results show that the selected raw materials and their proportioning method are feasible. The content of river sand plays a major role in controlling the density and Poisson’s ratio of similar materials. The mass ratio of aggregate to binder is the main factor affecting the uniaxial compressive strength and elastic modulus of similar materials, while the cementing concentration has the second largest influence on the density, uniaxial compressive strength, elastic modulus and Poisson’s ratio of similar materials. Determining the cementing concentration that matches the design of similar material model tests is critical to improving test accuracy and provides a reference for the preparation of similar materials for water resisting layer under different requirements during the development of similar materials.

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Comparative Analyses Concerning Triaxial Compressive Yield Criteria of Coal with the Presence of Pore Water

Cited by 8 publications

References 26 publications

Effect of Slickwater on Methane Adsorption in Coal: Experiment and Molecular Simulation

Effect of Slickwater on Methane Adsorption in Coal: Experiment and Molecular Simulation

Porosity and Fracture Changes of Coal under Uniaxial Strain Conditions Based on the X-ray Microscopic Imaging Technology

Experimental development process of similar material of water resisting layer in physical model test

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