Mining disturbance effect and mining arrangements analysis of near-fault mining in high tectonic stress region

Ji, Hongguang; Ma, Hongru; Wang, J.A.; Zhang, Y.H.; Cao, Hui

doi:10.1016/j.ssci.2011.08.062

Cited by 39 publications

(21 citation statements)

References 2 publications

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“…Theoretical analysis and physics-based experimental methods have advantages in establishing fault instability models and analyzing fault-slip behaviors, but to analyze the influence of faults on the stope in engineering, the numerical simulation method has obvious advantages because many geological and engineering factors need to be considered, such as the nature of the fault zones, the ground stress distribution, and the spatial extent of mining. Therefore, many scholars have used numerical simulation methods to study the effects of the fault dip, length, and physical and mechanical parameters on the mining stress distribution and fault-slip characteristics [12][13][14][15][16]. Studies show that the characteristic parameters of faults have a significant impact on the distribution of mining stresses and the magnitude of fault shear slips.…”

Section: Introductionmentioning

confidence: 99%

Mining Stress Distribution and Fault-Slip Behavior: A Case Study of Fault-Influenced Longwall Coal Mining

et al. 2019

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It is well accepted that faults have significant impacts on the safe production of underground coal mines; however, the fault-slip mechanism during longwall mining through a fault still needs to be investigated. In this study, the distribution of microseismicity events during panel mining through a fault is analyzed, and 3-dimensional fast Lagrangian analysis of continua was used to study the mining stress distribution and fault-slip behavior under the two different mining directions, i.e., mining the panel through the fault from the footwall, or mining the panel through the fault from the hanging wall. The research shows that when the panel is mined through the fault from the footwall, the shear displacement of the fault is significantly greater than those created by mining the panel through the fault from the hanging wall. Under the two mining directions, the variation behaviors of the normal stress and shear stress on the fault are quite different, and fault-slips mainly occur in fault areas where the normal stress decreases. When mining the panel through the fault from the footwall, the slip mainly occurs in the coal-seam roof fault, and when mining the panel through the fault from the hanging wall, the slip mainly occurs in the coal-seam floor fault. According to the variations in the normal stress and shear stress of the fault during the period of mining the panel through the fault, the mechanism of the fault slip can be divided into three categories. 1: Normal stress and shear stress decrease abruptly, but the reduction of the normal stress is greater than that of the shear stress. 2: The normal stress is continuously reduced, the shear strength of the fault is decreased, and the shear stress is suddenly increased. 3: Both the normal stress and the shear stress increase, but the increase in the shear stress is greater than that of the normal stress. These research results can provide a reference for the layout of panels and for fault-slip-induced disaster prevention under similar conditions.

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Section: Introductionmentioning

confidence: 99%

Mining Stress Distribution and Fault-Slip Behavior: A Case Study of Fault-Influenced Longwall Coal Mining

et al. 2019

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“…Besides, the orientation of the principal stress changed frequently. By including a discontinuous interface in the numerical model, the dynamic disaster resulting from mining-induced stress and tectonic stress was investigated, and the mining arrangement at the near-fault region was optimized [26]. Numerical modeling of 3D stress rotation ahead of an advancing tunnel face indicates that the rotation angle of the principal stress was so large that its influence on the stability of the surrounding rock should be underlined [27,28].…”

Section: Introductionmentioning

confidence: 99%

Ground Response and Mining‐Induced Stress in Longwall Panel of a Kilometer‐Deep Coal Mine

Wang

Yang

et al. 2021

Shock and Vibration

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In order to improve ground control of the longwall mining, ground response and mining-induced stress in the longwall panel of a kilometer-deep coal mine are investigated in this study. Field measurements on abutment stress, roof displacement, and fracture development indicate that the region influenced by the longwall mining reaches 150 m ahead of the longwall face. Failure scope of the coal seam, where mining-induced fractures are well developed, ranges from 10 to 13 m inward the face line. Vertical stress concentration coefficient reaches 2.2. Based on the field measurements, a numerical model is moreover developed and utilized to examine the response of the principal stress to the longwall mining. The concentration coefficient, peak point location, and influence scope of the principal stress gradually become stable with an increase in face advancement. Regarding the major principal stress, the concentration coefficient and influence scope are 2.4 and 152 m, respectively, and the peak point locates 13 m inward the face line, which are consistent with the field measurements. With respect to the minor principal stress, the referred coefficient and scope are 1.5 and 172 m, respectively, and its peak point location is 21 m ahead of the face line. The major principal stress in the coal seam rotates from vertical to horizontal direction in the vertical plane parallel with face advance direction. The maximum rotation angle reaches 20°. The minor principal stress first rotates into the referred vertical plane and then it rotates from horizontal to vertical direction at the same speed with the major principal stress in the same plane. Rotation angle of the principal stress in roof strata is greatly enlarged, the rotation trace of which is influenced by the longwall mining and vertical distance above the seam. Based on the relation between rotation trace of the principal stress and face advance direction, the influence of stress rotation on the stability of roof structure is discussed.

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“…They also evaluated the possibility of rock burst near the fault. Ji et al (2012) analysed the influence of mining disturbance on the stress environment of the fault by proposing the dynamic Coulomb failure stress model. Li et al (2014) established a fault-coal pillar mechanical model and obtained a roof instability criterion.…”

Section: Introductionmentioning

confidence: 99%

A physical model study of surrounding rock failure near a fault under the influence of footwall coal mining

Shu-kun

Wang

et al. 2020

Int J Coal Sci Technol

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A study of the deformation of the surrounding rock and coal pillars near a fault under the influence of mining is conducted on a physical model for the design of coal pillars to support and maintain the roofs of adjacent fault roadways. This research is based on the 15101 mining face in the Baiyangling Coal Mine, Shanxi, China, and uses simulation tests similar to digital speckle test technology to analyse the displacement, strain and vertical stress fields of surrounding rocks near faults to determine the influence of the coal pillar width. The results are as follows. The surrounding rock of the roadway roof fails to form a balance hinge for the massive rock mass. The vertical displacement, vertical strain and other deformation of the surrounding rock near the fault increase steeply as the coal pillar width decreases. The steep increase in deformation corresponds to a coal pillar width of 10 m. When the coal pillar width is 7.5 m, the pressure on the surrounding rock near the footwall of the fault suddenly increases, while the pressure on the hanging wall near the fault increases by only 0.35 MPa. The stress of the rock mass of the hanging wall is not completely shielded by the fault, and part of the load disturbance is still transmitted to the hanging wall via friction. The width of the fault coal pillars at the 15101 working face is determined to be 7.5 m, and the monitoring data verify the rationality of the fault coal pillars.

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Mining disturbance effect and mining arrangements analysis of near-fault mining in high tectonic stress region

Cited by 39 publications

References 2 publications

Mining Stress Distribution and Fault-Slip Behavior: A Case Study of Fault-Influenced Longwall Coal Mining

Mining Stress Distribution and Fault-Slip Behavior: A Case Study of Fault-Influenced Longwall Coal Mining

Ground Response and Mining‐Induced Stress in Longwall Panel of a Kilometer‐Deep Coal Mine

A physical model study of surrounding rock failure near a fault under the influence of footwall coal mining

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