Analysis of the diffusion process of mining overburden separation strata based on the digital speckle correlation coefficient field

Yuan, Chunyan; Yuan, Zijin; Wang, Ying-Ting; Li, Cong-Ming

doi:10.1016/j.ijrmms.2019.04.016

Cited by 14 publications

(8 citation statements)

References 2 publications

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“…However, the information conveyed by single damage unit is highly limited. In this case, the relationship between deformation energy density and energy can be used to assess coal rock stability, which is more comprehensive and practical (Yuan et. al.…”

Section: Calculation Methods Of Strain Energy Ratio Coe Cient Mmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

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The slippage initiation and induced instability of roadway surrounding rock are highly likely to cause dynamic disasters, severely influencing the safety production of mining. With the optical-mechanical monitoring test of the deformation localization of energy dissipation, this study established the optical index of coal deformation equilibrium degree under load, and obtained the evolution law of coal deformation equilibrium degree. After analyzing the relationship between tensile-sliding effect and mechanical behavior of coal deformation field, it proposed the strain energy ratio coefficient. The results indicate that the strength reduction of coal body is affected by the deformation accumulation of loading displacement field. The sliding displacement of the stable sliding type specimen occurs 5.5s earlier than tensile displacement，which is 4.4s longer than the instantaneous instability type specimen. The instability type of coal is closely related to the tangent angle of the strain energy ratio coefficient and the damage persistence characteristics. The damage accumulation of stable equal amplitude contributes to the stable failure, and the damage accumulation of interval equal amplitude influences the instantaneous instability development. The fracture expansion stage is the main stage of energy consumption damage accumulation. That is, the main energy consumption damage accumulation stage of the stable slip coal is the stable crack expansion stage, with the damage proportion of 35.89%, while the damage proportion of instantaneous instability coal in the unsteady crack expansion stage is 84.226%. The study provides theoretical reference for the fracture law and risk monitoring of coal slippage.

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Section: Calculation Methods Of Strain Energy Ratio Coe Cient Mmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

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“…In addition to in situ detection, physical similarity simulation on the experimental platform through similar materials with similar ratios is also a vital means, and it is widely used in the study of mine pressure and overburden dynamic changes due to its economy, intuitiveness, and ease of operation 5 , 13 – 16 . Some scholars have used the Ashby diagram to analyze the stability of racks during the coal development process.…”

Section: Introductionmentioning

confidence: 99%

Study on the damage characteristics of overburden of mining roof in deeply buried coal seam

Long

Hou

Xie

et al. 2022

Sci Rep

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The study of water-conducting fracture zone development height is key to the scientific prevention and control of water damage in mines. Based on the geological conditions of the Wenjiapo coal mine in Binchang, China, this paper investigates the development of water-conducting fracture zone in overlying bedrock during mining under large buried depth and huge thick aquifer by combining on-site well-location microseismic monitoring and laboratory similar material simulation. To overcome the limitation of the " limited outlook " of water-conducting fracture zone investigation, the spatial development characteristics of roof fissures in coal seam mining were determined by on-site " the underground - ground" combined microseismic monitoring and follow-up monitoring, and the development of overlying rock fracture under the large depth of burial was concluded. The fractures were mainly distributed in the upper part of the protective coal pillar on both sides of the working face, but less in the upper part of the working face, and primarily distributed in the protective coal pillar on the side of the working face and the adjacent mining area. To verify the accuracy of the conclusion, the overlying bedrock movement and deformation characteristics and the development process of the hydraulic fracture zone during coal seam mining were analyzed by simulating similar materials in the laboratory, using the monitored area as a prototype. The results show that the development height of the mining fracture zone obtained from microseismic monitoring is basically consistent with the simulation results of similar materials. The research finding have significant implications for the study of fracture distribution characteristics and the evolution law of mining overburden, and provide a foundation for scientific prevention and control of water damage on the roof.

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“…At present, the main methods for studying the caving of orebody and rock mass include similar material simulation experiment, numerical simulation analysis, theoretical analysis, and on-site monitoring [7][8][9][10][11][12][13]. e simulation of surrounding rock stress and deformation is the key to the development or improvement of new treatment methods for goafs, and similarity physical model test is one of the typical research methods.…”

Section: Introductionmentioning

confidence: 99%

“…ese years, the development of computer analysis software, sensors, and imaging technology makes it possible to obtain the temporal and spatial evolution rules of caving process, caving arch, and cracks during the test. In addition, the introduction of on-site drilling monitoring equipment has further optimized the goaf management scheme [12,17,18].…”

Section: Introductionmentioning

confidence: 99%

Similarity Model Test on the Spatiotemporal Evolution Law of Deformation and Failure of Surrounding Rock‐Induced Caving in Multi‐Mined‐Out Areas

Ren

Zhou

et al. 2021

Advances in Civil Engineering

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Taking the deep mined-out areas of Paishanlou Gold Mine as the research object, we designed the indoor similar physical model test and used VIC-3D and resistance pressure sensors to record the vertical stress and strain of the model during the test. And based on the results of digital image correlation (DIC) analysis, we deeply analyzed the deformation and failure characteristics of the surrounding rock in the process of goaf caving. At the same time, the failure mechanism of surrounding rock mass and the law of temporal and spatial evolution during the excavation process of pillars between the mined-out areas were studied. According to the characteristics of the caving process, it can be divided into three stages: initial caving in a small range at the arch angle, continuous vault collapse, and instantaneous huge caving of the roof. Before the occurrence of instantaneous large caving at the top, the phenomenon of sudden increase of caving arch curvature appears. Based on the monitoring results, it can also be seen that the deformation of overlying rock mass is most affected by the span of the cavity, and the vertical strain is inversely proportional to the depth. The rock mass stress and strain caused by the excavation of isolation pillars between adjacent two goafs have an obvious time delay phenomenon. The time delay effect of the strain is proportional to the span of the cavity; conversely, it is inversely proportional to the span of the cavity. Specifically, throughout the experiment, the subsidence of the target area of the test model is larger in the middle and smaller on both sides; simultaneously, the upper part is high, and the lower part is low. However, the variation of the stress value shows the characteristics of higher on both sides and lower on the middle area and higher on the upper part and lower on the lower part. To sum up, the experimental results show that the caving process can be predicted and effectively controlled manually, and a new treatment method can be provided for the control and prevention of the large caving and mining subsidence damage in the goaf combined with the field monitoring method.

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Analysis of the diffusion process of mining overburden separation strata based on the digital speckle correlation coefficient field

Cited by 14 publications

References 2 publications

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Study on the damage characteristics of overburden of mining roof in deeply buried coal seam

Similarity Model Test on the Spatiotemporal Evolution Law of Deformation and Failure of Surrounding Rock‐Induced Caving in Multi‐Mined‐Out Areas

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