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Floor failure and roadway deformation induced .

Mining-induced floor failure of contiguous coal seams, numbered 1#, 3#, 5#, 7#, and 12#, is studied by theoretical calculation and numerical simulation based on the geological conditions at Huopu Mine. The results indicate that pressure relief failure of the floor in the mining of contiguous coal seams is notably different from that in the mining of a single coal seam.

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Deformation Failure Characteristics of Coal Body .

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The results provide theory reference for the research on the range of mining-induced stress and broken coal wall. 1. Introduction. With the deterioration of occurrence condition of coal resources, mechanical environment for coal mining, organization structure of coal and rock mass, its mechanical behavior and failure characteristics become complicated, so the characteristics of engineering ...

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Evolution of mining‐induced stress in fully .

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The studies of top‐coal caving directly determine operational parameters of FMTC on site, 4, 5 and broken lumpiness of top‐coal directly affects recovery of top‐coal, 6-8 while failure of top‐coal is a mechanical response under mining‐induced stress. 9 Therefore, the evolution of mining‐induced stresses is one of the key problems facing those studying basic theories of FMTC.

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CDC - Mining - Shear Mechanism for Mining .

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The concept of mining-induced fractures forming as a result of shear is illustrated by two examples from coal mines. First, fractures seen at longwall faces probably result from shear associated with subsidence. The fracture zone that develops approximates or possibly defines the draw angle of subsidence. As the face advances, fractures extend downward along the lower edge of the fracture zone ...

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Mining Induced Seismicity | SpringerLink

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One or combination of the above factors may contribute significantly to mining seismcity in any specific case (Gibowicz and Kijko, 1994; Mendecki, 1997; Holub, 1997; Holub et. al., 1995)). It is often observed that most of the damaging events, commonly known as rockbursts, are induced at the geological discontinuity in the mining area, Figure 5 ...

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Coal mine subsidence—western United States | .

Coal mine subsidence is the local lowering of the ground surface caused by coal mining. Subsidence processes above underground mines consist of a gradual downwarping of the overburden into coal extraction panels, which causes depressions, or a sudden collapse into individual mine openings, which causes pits. Subsidence type (depressions, pits), amount, areal extent, rate, and duration are ...

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A 2-D differential-stress-based analysis on the .

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Mining induced stress, especially discontinuous redistribution and stress drop, is a major issue of structural stability in deep coal mining. Only considering the yield criterion as the continuous ...

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Floor failure and roadway deformation induced .

Mining-induced floor failure of contiguous coal seams, numbered 1#, 3#, 5#, 7#, and 12#, is studied by theoretical calculation and numerical simulation based on the geological conditions at Huopu Mine. The results indicate that pressure relief failure of the floor in the mining of contiguous coal seams is notably different from that in the mining of a single coal seam.

Get Price

CDC - Mining - Shear Mechanism for Mining .

The concept of mining-induced fractures forming as a result of shear is illustrated by two examples from coal mines. First, fractures seen at longwall faces probably result from shear associated with subsidence. The fracture zone that develops approximates or possibly defines the draw angle of subsidence. As the face advances, fractures extend downward along the lower edge of the fracture zone ...

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Role of Bioavailable Iron in Coal Dust-Induced .

Interestingly, the coal from the UT coal mine region with a low prevalence of CWP did not induce phosphorylation of ERKs or JNKs, although it activated the phosphorylation of p38 kinase as the PA coal did, but to a lesser extent. The positive control, 2 μM benzo(a)pyrene diol-epoxide did activate the phosphorylation of JNKs, indicating that coals from the PA and UT coal mine region did not ...

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Assessing risks from mining-induced ground .

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01/01/2020 · Hundreds of planned and actively producing wells penetrate protective coal pillars or barriers within active mine boundaries, including chain pillars located between longwall panels. Gas released from a well damaged by mining-induced ground movements could pose a risk to miners by flowing into the mine atmosphere.

Author : Christopher Mark, Gregory M. RumbaughGet Price

Rapid decompression and desorption induced energetic ...

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outburst and represents a major coal mining hazard. T D ACCEPTED MANUSCRIPT Rapid decompression and desorption induced energetic failure in coal Shugang Wang a, *, Derek Elsworth a, Jishan Liu b a Department of Energy and Mineral Engineering, EMS Energy Institute and G 3 Center, Pennsylvania State University, University Park, PA, USA b School of Mechanical and Chemical .

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Land Subsidence in a Coal Mining Area Reduced .

The land subsidence induced by coal mining caused a loss of soil water and soil salinization, which led to a reduction in soil quality. 5. Conclusions. Our study showed that land subsidence had severe effects on soil properties, such as the SWC, soil EC, soil particle-size distribution, nutrients, enzyme activities, and bacterial quantity. Land subsidence caused ground cracks and the vertical ...

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Coal Burst Induced by Horizontal Section Mining .

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3. Mechanism of Coal Bursts Induced by Horizontal Section Mining of SICSs 3.1. Superposition of Dynamic and Static Loads. A number of studies and field cases have shown that coal bursts are induced by tremors under concentrated stress, i.e., coal bursts induced by dynamic combined with static loads.

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Study on Roof Breakage-Induced Roadway Coal .

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In view of the coal burst induced by roof breakage in the steeply inclined coal seam (SICS) roadway and its mechanism, a mechanical model was established to investigate the distribution of dynamic and static stresses in the coal seam before and after the breakage of a thick hard roof. The aim of this research is to study failure laws of SICS roadways under the superposition of dynamic load ...

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A review of coal mining induced fault reactivation .

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In some circumstances, such as minewater rebound or residual mining subsidence, further movements along a previously reactivated fault are possible. The objectives of this paper are to provide, for the first time, a comprehensive account of reported and recorded cases of mining-induced fault reactivation in Britain. These have been compiled ...

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Coal Burst Induced by Horizontal Section Mining .

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3. Mechanism of Coal Bursts Induced by Horizontal Section Mining of SICSs 3.1. Superposition of Dynamic and Static Loads. A number of studies and field cases have shown that coal bursts are induced by tremors under concentrated stress, i.e., coal bursts induced by dynamic combined with static loads.

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New Method to Design Coal Pillar for Lateral Roof .

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Mining-induced stress contour presents a concave-upward type from coal seam to the overlying strata that cannot be merged into a straight one due to their different characteristics of movement and deformation. With this in mind, this study proposed a method to design the width of coal pillar for lateral roof roadway according to the mining-induced stress contour. According to mining-induced ...

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Mining Induced Seismicity | SpringerLink

Effect of artificially induced vibrations on the prevention of coal mine bumps in Rockbursts and Seismicity in Mines 93 (ed. R.P. Young ), 91. Google Scholar Lightfoot, N., (1993) .

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Size and spatial fractal distributions of coal fracture ...

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The size and spatial distributions of mining-induced coal microfractures and the anisotropic tortuosity characteristics of coal fracture networks have been quantitatively determined based on fractal theory.

Author : Zetian Zhang, Heping Xie, Heping Xie, Ru Zhang, Mingzhong Gao, Mingzhong Gao, Ting Ai, Ersheng ZhaGet Price

A General Review on Longwall Mining-Induced .

Therefore, mining-induced fractures are significant for the safety evaluation of underground structures and finding feasible solutions. On the other hand, the fractures are also beneficial for methane collection and coal fragmentation, which are essential for the successful operation of longwall top coal caving mining. Therefore, determining ...

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