Floor Failure Evolution Mechanism for a Fully Mechanized Longwall Mining Face above a Confined Aquifer

Zhai, Jinghui; Liu, Danlong; Li, Gang; Wang, Fangtian

doi:10.1155/2019/8036928

Cited by 12 publications

(6 citation statements)

References 2 publications

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“…Under long-term external disturbance, an underground reservoir is prone to floor damage, coal pillar collapse, etc., resulting in the overall destruction of the reservoir [ 27 ]. Rock failure under stress–seepage coupling is a typical problem, which is different from rock failure under single action [ 28 , 29 ]. Underground reservoirs have particular importance because of their special geographical environment.…”

Section: Model Constructionmentioning

confidence: 99%

Influence of spatial structure migration of overlying strata on water storage of underground reservoir in coal mine

Cao,

Jing,

Wang

et al. 2024

PLoS ONE

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Underground reservoir technology for coal mines can realize the coordinated development of coal exploitation and water protection in water-shortage-prone areas. The seepage effect of the floor seriously affects the safety of underground reservoirs under the action of mining damage and seepage pressure. Focusing on the problem of floor seepage in underground reservoirs, a spatial mechanical model of underground reservoirs was established. The main factors affecting the seepage of the surrounding rock were studied. The seepage pressure law in different stages of spatial structure evolution of overlying strata was explored. The results showed that pressure change was the main factor affecting the stability of a reservoir’s surrounding rock. The pore space between the broken and fractured rock in the water-flowing fractured zone was the main water storage space, which was directly related to the development of a breaking arch. According to the spatial structure evolution process of the overlying strata, the water storage state of an underground reservoir was divided into two stages and three situations. The seepage pressure was mainly affected by the water pressure and the overlying strata weight. The water pressure was affected by the reservoir head height, and the overlying strata weight was mainly affected by the overlying strata thickness.

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Section: Model Constructionmentioning

confidence: 99%

Influence of spatial structure migration of overlying strata on water storage of underground reservoir in coal mine

Cao,

Jing,

Wang

et al. 2024

PLoS ONE

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“…With the increase of coal mining depth, the probability of mine water damage increases gradually. In water hazards, the water inrush of sandstone in coal seam roofs accounts for a large proportion (Zhai et al., 2019). Sandstone, as the main aquifer of the coal seam roof, has been accurately interpreted as the physical property, which is an important factor in reducing water damage from the roof.…”

Section: Introductionmentioning

confidence: 99%

Seismic attribute transformation and porosity prediction of thin water‐rich sandstone based on Lambert W–R model

Li,

Chen,

Yin

et al. 2024

Geophysical Prospecting

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The seismic attributes of water‐rich sandstone contain much information about the rock's physical properties and seismic wave parameters. They are commonly used to predict the rock's physical properties (e.g., porosity). However, the seismic attributes of water‐rich sandstone are affected by porosity, water saturation, and thickness. To eliminate the influence of thickness on the porosity prediction of water‐rich sandstone and improve the accuracy of the porosity prediction, the authors propose a Lambert W‐R transform method to isolate the contribution of thickness and porosity from seismic attributes. Firstly, a rock physical model is used to calculate the equivalent elastic parameters of water‐rich sandstones with different porosity and water saturation. Secondly, the seismic attribute dataset of water‐rich sandstone is established by forward modeling the seismic response of the wedge‐shaped water‐rich sandstone model, and the selection of sensitive physical properties is completed. Then, the transformation parameters (ζAhRs and ηAhRs) are obtained by Lambert W‐R transformation, which is exponentially related to Instantaneous amplitude (Inst‐Amp). ζAhRs and ηAhRs are sensitive to thickness and porosity, respectively. Finally, an interpretative template for porosity prediction of water‐rich sandstone is established by cross‐plot analysis (ζAhRs and ηAhRs) and verified by a practical case. The verification results show that the porosity predicted by the interpretation template is consistent with drilling fluid consumption. However, it is lower than the porosity of logging constrained P‐wave impedance inversion.This article is protected by copyright. All rights reserved

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“…The parameters affecting the floor stability of paste-filling face mainly include filling strength, filling rate, filling step, etc. Relevant researchers have conducted a series of studies on the floor failure of paste filling on confined water [22][23][24][25][26]. Some researchers have analyzed the influencing factors of floor failure in paste-filling face from the perspective of filling strength and filling rate [27,28].…”

Section: Introductionmentioning

confidence: 99%

Analysis on Water Inrush Prevention Mechanism of Paste-Filled Floor above Confined Water

et al. 2022

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To study the influence of filling step and advancing distance on the deformation and failure of a working face floor, a mechanical model based on elastic foundation beam theory is established. The deflection and bending moment curves of the floor under different filling steps and advancing distance are obtained by Maple. Then, a fluid–solid coupling model of paste-filling mining on confined water is established by FLAC3D. The effects of different filling steps and advancing distance on the floor displacement, stress, and plastic zone of the floor are analyzed. The results show that there is a “concave” quadratic relationship between the filling step and the maximum displacement of the floor, and there is a “convex” quadratic relationship between the advancing distance and the maximum displacement of the floor. The maximum stress of the floor increases linearly with the increase in filling distance and tends to be stable with the increase in advancing distance. Moreover, the increase in filling steps will lead to the continuous increase in longitudinal failure. This study could guide paste-filling mining above confined water.

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Floor Failure Evolution Mechanism for a Fully Mechanized Longwall Mining Face above a Confined Aquifer

Cited by 12 publications

References 2 publications

Influence of spatial structure migration of overlying strata on water storage of underground reservoir in coal mine

Influence of spatial structure migration of overlying strata on water storage of underground reservoir in coal mine

Seismic attribute transformation and porosity prediction of thin water‐rich sandstone based on Lambert W–R model

Analysis on Water Inrush Prevention Mechanism of Paste-Filled Floor above Confined Water

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