Influence of fracture-induced weakening on coal mine gateroad stability

Jiang, Lishuai; Sainoki, Atsushi; Mitri, Hani S.; Ma, Ninshu; Liu, Hongtao; Hao, Zhen

doi:10.1016/j.ijrmms.2016.04.017

Cited by 119 publications

(53 citation statements)

References 19 publications

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“…In addition, there are few studies regarding the evolution of mining stress and fault activation under the influence of normal faults. In this study, according to the situation in the front side of the working face, a three-dimensional numerical simulation software, FLAC 3D , which widely employed in ground stability analysis in underground coal mines (Jiang et al, 2016), is used to study the influence of normal faults on the dynamic stress evolution and fault activation law. The main research objectives of this study are: (1) determining the evolution characteristics of mining stress when the hanging wall and footwall working faces head towards a fault; (2) obtaining the shear stress and normal stress evolution characteristics when the hanging wall and footwall working faces head towards a fault and further analyze the law of fault activation; (3) reconstructing the energy accumulation and dissipation processes of the fault during the process of the working face heading.…”

Section: Working Face Stress Evolution Law During Footwall Miningmentioning

confidence: 99%

Study on the law mining stress evolution and fault activation under the influence of normal fault

Wu¹

2017

Acta Geodynamica Et Geomaterialia

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Using the FLAC 3D numerical simulation method, the characteristics of mining stress evolution, fault activation patterns, and fault energy evolution characteristics are simulated and analyzed in the process of the footwall and hanging wall working face heading to a normal fault. The study shows that the fault cut off the mining stress propagation of overlying strata, and the stress blocking effect due to the fault is evident. When working faces head towards a fault, the abutment pressure and the vertical stress of the surrounding rock increase first and subsequently decrease. The abutment pressure of the coal wall and fault is highest when the distances to the fault are 40 m and 30 m for the footwall and hanging wall working faces, respectively. Moreover, the hanging wall mining stress is higher than the footwall mining stress. Fault activation in high-located strata precedes that in low-located strata when working faces head towards the normal fault. Energy is gradually accumulated before unstable fault events take place because of mining, and fault instability quickly releases a lot of energy. The mining stress concentration and fault activation due to faults easily result in rock bursts and mine seismicity. ARTICLE INFO

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Section: Working Face Stress Evolution Law During Footwall Miningmentioning

confidence: 99%

Study on the law mining stress evolution and fault activation under the influence of normal fault

Wu¹

2017

Acta Geodynamica Et Geomaterialia

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“…The distribution laws of the mining stress in floor and its additional stress were analyzed by utilizing numerical simulations and physical simulations, and reasonable parameters for a floor roadway layout were obtained (Gao et al, 2015;Ma et al, 2015;Liu et al, 2016;Feng et al, 2016). In terms of the deformation and stability of a roadway, the deformation characteristics of the surrounding rocks, such as the floor heave and roof fall of the roadway, were examined using on-site observations, physical simulations, and numerical simulations (Islam and Shinjo, 2009;Jiang et al, 2016Jiang et al, , 2017a. Given the instability of roadways with a soft interlayer, the physical and chemical properties, along with the engineering mechanical properties of the soft interlayer were studied using rock mechanical tests, physical simulations, numerical simulations, and theoretical analysis.…”

Section: Introductionmentioning

confidence: 99%

Evolution Laws of Mining-induced Stress in Floor Strata and Its Influence on the Stability of a Floor Roadway Affected by Overhead Mining

Wang

Jiang

et al. 2020

Earth sci. res. j.

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Based on the geological conditions of a drainage roadway in the Xinglongzhuang coalmine of Shandong province (China), a mechanical model of a working face for overhead mining over a roadway was established, and the laws influencing the mining-induced stress were obtained. The evolution of mining-induced stress in the floor with different horizontal distances between working face and floor roadway was examined using universal distinct element code (UDEC) numerical simulation; the stability of the floor roadway was analyzed. The results of the numerical simulation were verified via on-site tests of the deformation of surrounding rocks and bolt pull-out readings from the drainage roadway. The results indicated that the floor roadway was significantly affected within a certain depth and then the effect weakened with the depth increasing. In view of the roadway stability, the roadway was observed with worse stability of surrounding rocks during the period of the working face mining near the roadway or just passing the roadway; moreover, this exploitation was not safe and needed to strengthen the support for the roadway. The results may provide a scientific basis for determining reasonable locations and support for roadways in Xinglongzhuang coalmine and other coal mines with similar coal measures strata.Leyes de evolución en el esfuerzo del suelo y de estabilidad de la superficie de una calzada afectada por minería aérea

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“…Many scholars start from the stress environment around the surrounding rock of mining roadway to analyze the surrounding rock failure characteristics under the action of this stress environment. Dolezalova et al [11][12][13][14][15][16][17] used FLAC3D, FDEM, and 3EDC to simulate the stress distribution and failure development of deep engineering, they clarified that the development of stress environment is the essential cause of the deformation and destruction of surrounding rock. Chang et al [18][19][20] revealed the surrounding rock stability control mechanism of deep rock roadway by analyzing the stress development characteristics, deformation and failure mechanisms of surrounding rock after excavation of deep rock roadway.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Mechanical Instability of Mining Roadway Overburden: Research and Applications

et al. 2019

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Under the superposed action of the primary rock stress and the mining stress, the compound roof of a roadway will have irregular plastic failure zone with greater depth, resulting in a wide range of non-uniform deformations and roof failures. Mastering the deformation and failure characteristics of this roof is essentially to recognize the development of the plastic zone of a compound roof. In this paper, the on-site roof detection method is mainly adopted to arrange a large number of boreholes for visualization and the deep displacement monitoring with the high-density points. Combined with numerical simulations, the rupture development characteristics and deformation mechanisms of the compound roof are revealed. The results show that the magnitude and direction of the principal stress of surrounding rock in a mining roadway are constantly changing, and the penetrating phenomenon will occur during the plastic zone expansion process. The order of the compound roof rupture as follows: shallow strata plastic failure, deep strata penetrating plastic failure and middle strata rupture. Severe roof deformation is mainly caused by plastic failure, and the strong deformation pressure caused by deep strata penetration plastic failure can easily lead to tensile failure and rupture in the middle strata. According to the plastic zone penetration development of the compound roof, the hierarchical support design led by the long-extension bolt is carried out on the test roadway. The monitoring results show that the roof is controlled well. The research results can provide a reference for the control of compound roofs in mining roadways.

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Influence of fracture-induced weakening on coal mine gateroad stability

Cited by 119 publications

References 19 publications

Study on the law mining stress evolution and fault activation under the influence of normal fault

Study on the law mining stress evolution and fault activation under the influence of normal fault

Evolution Laws of Mining-induced Stress in Floor Strata and Its Influence on the Stability of a Floor Roadway Affected by Overhead Mining

Evaluation of the Mechanical Instability of Mining Roadway Overburden: Research and Applications

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