Comprehensive Study of Strata Movement Behavior in Mining a Longwall Top Coal Caving Panel of a Composite Coal Seam with Partings

Liu, Hongtao; Guo, Litong; Cao, Guang-ming; Zhao, Xidong; Wang, Pengfei; Huo, Tianhong; Yang, Gang; Cheng, Hao; Wang, Qiang

doi:10.3390/app10155311

Cited by 10 publications

(5 citation statements)

References 28 publications

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“…Авторами предлагается новая методика исследования процессов деформирования на физической модели, основанная на решении «обратной» задачи воспроизведения заданной эволюции процессов сдвижения земной поверхности по данным натурных реперов и экстраполяции этих процессов при сохранении темпов прироста вертикальных оседаний земной поверхности, обусловленных процессами деформирования и разрушения целиков [28][29][30].…”

Section: методика и результаты исследованийunclassified

Physical simulation of nonlinear geomechanical processes in potash ore mining

Zuev,

Istomin,

Obozhina

2023

gzh

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Experience of mining potash and potash-magnesium salt is reflective of extremely high number of accidents and deprivations of mines even when most advanced technologies are used. Difficult maintenance of long-term accident-free performance of geotechnical systems through all mining phases at rock salt deposits is connected with the extremely complex and yet understudied nonlinear processes of rock displacements governed by alteration of impermeable strata in-between stoping and aquifers. These nonlinear displacements induce through-the-thickness permeable cracks in the impermeable strata. Generally, the zone of permeable cracks is composed of two hydraulically interconnected systems of induced fractures: exfoliation joints and through-the-thickness dip joints. When the upper boundary of the permeable fracture zone reaches the lower boundary of a body of water, these channels become available for water flow to underground openings. One of the most efficient ways to study such nonlinear processes is modeling using equivalent materials. However, this method has some constraints connected with the requirements to ensure integrated similarity of the compression, tension and bending strengths which are critical in the research of rock movement processes. This article offers a modification of modeling using equivalent materials based on the better similarity achieved in strength parameters of rocks and the method of discrete change of a movement trough at the level of productive strata, which ensures simulation of the movement trough on ground surface with regard to the linear scale of modeling. The main research finding is the forecast of nonlinear displacement processes in rock mass and the refinement of jointing and exfoliation parameters which, given certain conditions, can initiate through-the-thickness permeable channels.

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Section: методика и результаты исследованийunclassified

Physical simulation of nonlinear geomechanical processes in potash ore mining

Zuev,

Istomin,

Obozhina

2023

gzh

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“…Известно, что в основе метода моделирования на ЭМ лежит разработка ЭМ, удовлетворяющих критериям подобия [5,6,[24][25][26][27][28][29]. Среди последних необходимо выбрать те из них, которые наиболее важны для характера исследуемых процессов.…”

Section: общая методология физического моделирования на эквивалентных...unclassified

Efficiency evaluation of destressing drilling by numerical and physical modeling toward rockburst nonhazardous conditions in mines

Bagautdinov¹,

Zuev²,

Streshnev³

2023

gzh

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The article puts forward and describes an integrated numerical/physical modeling procedure to improve evaluation efficiency of destressing drilling aimed at creating rockburst unhazardous conditions in underground openings. When rocks in the interwall space reaches the limit state under the action of rock pressure, the zones of stress concentration displace from the boundary of an underground opening into the depth of rock mass. As a result of the proposed activity implemented in underground mines of Apatit's Division in Kirovsk, the risk of an underground rock burst was reduced essentially

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“…Such research has enriched the theoretical system of surrounding rock control. Furthermore, scholars have used different experimental and numerical methods to collate a large number of field application cases [16][17][18][19][20]; this is also expected to serve as a reference for future research in this field. Researchers have reported that the principal stress has a significant influence on the stability of roadway surrounding rocks [21][22][23][24].…”

Section: Engineering Backgroundmentioning

confidence: 99%

Comprehensive Study on Surrounding Rock Failure Characteristics of Longwall Roadway and Control Techniques

Yang

Huang

et al. 2021

Applied Sciences

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Research on underground coal mines has primarily focused on the stability of roadways. Mining activities lead to significant damage to the surrounding rocks and also degrade the support to the roadways. Considering the 21309 roadway of the Huojitu coal mine as a case study, this work comprehensively analyzed the characteristics of the surrounding rock using three methods: theoretical calculations, FLAC3D numerical modeling, and field observations. The results indicate that, under the influence of secondary mining, the failure range and stress concentration degree of the surrounding rock are considerably higher than those under the influence of primary mining. In this case, the maximum damage range in the surrounding rock can reach 1.8 m, the maximum principal stress can reach 19.82 MPa, and the ratio of the maximum principal stress to the minimum principal stress can reach 1.95. According to the results, the previous support design for roadways was optimized and applied in the field. Field monitoring revealed that the roadway deformation was effectively controlled, and the optimized support design was safe and reliable. This study is expected to serve as a reference for support designs or optimization under similar geological conditions.

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Comprehensive Study of Strata Movement Behavior in Mining a Longwall Top Coal Caving Panel of a Composite Coal Seam with Partings

Cited by 10 publications

References 28 publications

Physical simulation of nonlinear geomechanical processes in potash ore mining

Physical simulation of nonlinear geomechanical processes in potash ore mining

Efficiency evaluation of destressing drilling by numerical and physical modeling toward rockburst nonhazardous conditions in mines

Comprehensive Study on Surrounding Rock Failure Characteristics of Longwall Roadway and Control Techniques

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