Failure Mechanism of Giant-Thick Strata Characterized by Weak Cementation Based on Superimposed Similar Material Simulation

Zhang, Guojian; Guo, Guangli; Gong, Yaqiang; Xiao, Anliang; Zhao, Tonglong; Li, Huaizhan

doi:10.1007/s12205-022-1423-4

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…In order to meet the needs of national construction and improve coal output, it is necessary to study coal mining under complex geological conditions. Many scholars have conducted research in different directions, such as deep coal mining [1][2][3], coal mining in fault-affected areas [4][5][6], underground mining of thin coal seams [7][8][9], and mining under hard roof conditions [10][11][12]. In these mining conditions, the fault is exceptional.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Law and Stress Distribution Characteristics of Overburden under the Influence of Multiple Faults

Qi,

Yu,

et al. 2023

Advances in Civil Engineering

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Taking the geological conditions of a coal mine in Liupanshui City, Guizhou Province, as the background. The fracture law of the roof in the coal face and the height of the “Two zones” were obtained through theoretical analysis and empirical formula calculation, and the results were verified using similar simulation experiments. Through numerical simulation were researched the stress distribution characteristics of the overlying strata on the working face under the influence of multiple faults. The results showed that in the early stage of mining, F1 undergoes activation under the influence of the main roof weighting, leading to an increase in the degree of plastic damage to the coal seam and strata behind the working face, causing a redistribution of the behind abutment pressure. Finally, under the influence of the F1 barrier effect, the vast majority of the behind abutment pressure is transferred to the lower strata of F1, leading to a continuous increase in stress concentration there. But as the working face continues to advance, the blocking effect of the roof plastic zone above the goaf on the transmission of the behind abutment pressure of the working face begins to appear and continues to increase, leading to a decrease in the peak stress at the lower strata of F1. The stress change process on the F2 side is similar to that on the F1 side, the front abutment pressure is initially distributed in the strata in front of the working face, but as the activation degree of F2 continues to intensify, it gradually shifts to the lower strata of F2, and ultimately the majority of the front abutment pressure is borne by the lower strata of F2.

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Section: Introductionmentioning

confidence: 99%

Research on the Deformation Law and Stress Distribution Characteristics of Overburden under the Influence of Multiple Faults

Qi,

Yu,

et al. 2023

Advances in Civil Engineering

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Development of the Asphalt Foaming Performance Evaluation System Based on Binocular Ranging Technology

Song,

Li,

Wang

et al. 2024

J. Mater. Civ. Eng.

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Development of non-hydrophilic similar materials for weakly cemented rocks and its experimental application in water conservation mining

Gu,

Qi,

Zhao

et al. 2024

Journal of Geophysics and Engineering

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The mining of coal mines in western China needs to focus on protecting groundwater. A non-hydrophilic similar material for simulating the development and hydraulic conductivity of weakly cemented overlying strata fractures was developed. Fine sand, coarse sand, and gypsum are used as aggregates. Paraffin and vaseline are used as binders. The non-hydrophilic material ratios of weakly cemented sandy mudstone and medium-grained sandstone were determined by orthogonal experiments, and used for similar simulation tests. The results show that the non-hydrophilicity of rock-like materials can be adjusted to prevent them from softening and collapsing under the action of water. Non-hydrophilic materials of higher strength and brittleness of rocks can be achieved by adjusting the content of paraffin, fine sand, and gypsum. The non-hydrophilic materials of soft and large particle rocks can be achieved by adjusting the content of paraffin, fine sand, and gypsum. After the coal seam in the similar simulation experiment was extracted, the large area of weakly cemented rock above it undergoes overall settlement and fracture. Although this part is located within the failure zone, there is no macroscopic water conducting cracks generated. The height of the water conducting fracture zone was lower than the height of the fracture zone classified by the traditional ‘three zone’ theory, which is consistent with the on-site measurements. This indicates that the prepared non-hydrophilic material is reliable. The similarity simulation method based on non-hydrophilic materials can enrich the means for studying the fracture and permeability of weakly cemented overlying rocks in coal mines.

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Failure Mechanism of Giant-Thick Strata Characterized by Weak Cementation Based on Superimposed Similar Material Simulation

Cited by 4 publications

References 15 publications

Research on the Deformation Law and Stress Distribution Characteristics of Overburden under the Influence of Multiple Faults

Research on the Deformation Law and Stress Distribution Characteristics of Overburden under the Influence of Multiple Faults

Development of the Asphalt Foaming Performance Evaluation System Based on Binocular Ranging Technology

Development of non-hydrophilic similar materials for weakly cemented rocks and its experimental application in water conservation mining

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