A new theoretical method for calculating front abutment stress during coal mining

Liu, Hao; Wang, Pu; Liu, Yuting; Dai, Jianlong; Ji-qiang, Yang

doi:10.1002/ese3.554

Cited by 7 publications

(5 citation statements)

References 25 publications

(40 reference statements)

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“…The other half of theload was transferred to the goaf, and the force on the lower rock mass exhibited a linear distribution. Considering the force of the key strata in the bending subsidence zone on the goaf side on the broken key strata in the fracture zone (at the lower part), the plane distribution equation of the mining stress under the KS i (1 ≤ i ≤ m−1, i ∈ N + ) in the fracture zone at different horizons on the goaf side for the 1/4 equal regions (Z 3 region in Figure 1) is obtained from Equation (11).…”

Section: Prediction Equation Of Mining Stress Plane Distribution Of B...mentioning

confidence: 99%

“…Equations ( 7) through (11) can be used to obtain the plane distribution equations σ 1 (x,y) and σ c 1 (x,y) of mining stress under KS 1 on the solid coal side and the goaf side. Considering the rock body weight q 0 between KS 1 and the coal seam and the plastic failure of the coal body under high mining stress concentration, combined with the distribution equations of the coal body in the plastic zone around the stope, 29 the plane distribution equation of the abutment pressure in the stope can be obtained from Equation (12).…”

Section: Prediction Equation Of Abutment Pressure Plane Distribution ...mentioning

confidence: 99%

“…Researchers have conducted numerous studies 5,10–15 on the formation mechanism and spatial distribution prediction methods of the mining stress field and proposed a number of hypotheses and theories, 16–19 such as the arch hypothesis, cantilever beam hypothesis, hinged rock block hypothesis, progenerated fissure hypothesis, masonry beam theory, transfer rock beam theory, and key strata theory of rock strata control. However, it remains impossible to accurately predict the spatial distribution of a mining stress field based on production experience or empirical formulas 5,13–16,20–25 .…”

Section: Introductionmentioning

confidence: 99%

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Mining stress formation and distribution: Predictive model based on overburden key strata structure

Han,

Hu,

Liu

et al. 2024

Energy Science & Engineering

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In coal mines, the effective extraction of relief gas and the prevention of dynamic disasters depend on accurate predictions of the spatial distribution of mining stress in the overlying rock. However, at present, the prediction of stress relief and concentration zones based on operational experience or empirical modeling differs significantly from actual measurements in the field. The fundamental problem is the difficulty in modeling the transfer mechanism of the mining overburden load under the influence of key strata. In this study, a mechanical model of the spatial distribution of the mining stress field based on the structure of overburden key strata was established. The model demonstrates that the key strata are the main bearing bodies of the overlying rock, both before and after the fracture, and the overburden rock load can be transferred to the coal and rock mass around the stope through the key strata in the fracture and bending subsidence zones, thus forming a mining stress field. Equations for calculating the plane distributions of mining stress under the key strata at different horizons and abutment pressures on the stope were established, and a spatial distribution prediction method for the mining stress field based on the overburden key strata structure was proposed. The study area was the Gaojiapu Coal Mine, where it was found that the key stratum of the 400.45 m thick Luohe Formation sandstone bore most of the overlying rock load and transferred the load to the coal and rock mass around the stope. This load distribution is the root cause of a high concentration and wide influence range of mining stresses, leading to serious deformation of the main roadway and frequent dynamic disasters. The mining stress concentration was maximized at a mining length of 1458 m × 1458 m.

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Section: Prediction Equation Of Mining Stress Plane Distribution Of B...mentioning

confidence: 99%

Section: Prediction Equation Of Abutment Pressure Plane Distribution ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mining stress formation and distribution: Predictive model based on overburden key strata structure

Han,

Hu,

Liu

et al. 2024

Energy Science & Engineering

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“…However, if the adjacent working face continues to be mined, the UMR will also break once the suspension length of UMR caused by two adjacent working faces mined exceeds its ultimate span. It should be noted that the parameter q in equation 1only considers the self-weight and its follower layers when calculating LMR breaking span and does not consider the disturbance load caused by the UMR suspension [18]. Hence, the actual ultimate span should be smaller than the calculated value; that is, it is more likely to break.…”

Section: Calculation Of Ultimate Stable Span Of Magmatic Rock Inmentioning

confidence: 99%

“…e prediction model of overburden movement and deformation is established, and the strata behaviors of surface subsidence and crack were studied [4,16]. Based on the formation mechanism of abutment stress, a new theoretical calculation method of abutment stress with overlying multilayer hard thick strata occurrence was proposed [17,18]. In view of the mining advancing towards faults and passing through faults, the displacement-stress characteristics of hard thick stratum were studied, and then the inducing-mechanism of rockburst was revealed [1,2].…”

Section: Introductionmentioning

confidence: 99%

Breaking and Instability Movement Characteristics of High-Position Double-Layer Hard Thick Strata due to Longwall Mining

Wang

Jiang

Bin

2020

Shock and Vibration

Self Cite

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With multilayer hard roof occurring above the mining area, the strata behaviors will be significantly affected by their special characteristics and interaction. In this paper, relying on the mining background of panel 1061 of a coalmine, the breaking instability of double-layer hard thick strata (DLHTS) and the precursory information of disasters are studied by using theoretical analysis, numerical simulation, and physical simulation. Results show that the DLHTS have bearing, blocking, and controlling effects. Prior to DLHTS breaking, the horizontal development of stress concentration zone and plastic zone can be controlled, and the overburden movement is gentle, while during the breaking process, the stress drops abruptly, the plastic zone expands longitudinally rapidly, the overburden moves notably, and the energy release is sharp, which is likely to directly cause strong dynamic pressure. Moreover, the DLHTS can interact with and influence each other; that is to say, the breaking of lower magmatic rock (LMR) can provide sufficient space for that of upper magmatic rock (UMR), while the UMR breaking can promote the LMR periodic breaking in turn and cause its secondary instability, thereby easily causing complex or composite dynamic disasters’ formation. Hence, compared with single hard thick stratum occurrence, the strata behaviors affected by DLHTS breaking and instability are normal and more intense. Study results can provide a scientific basis for the prevention and control of dynamic disaster with hard thick stratum occurrence and important guidance value for promoting safe and efficient production of coalmines.

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Excavation-induced deformation and damage evolution of deep tunnels based on a realistic stress path

Sun

Guo

et al. 2021

Computers and Geotechnics

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A new theoretical method for calculating front abutment stress during coal mining

Cited by 7 publications

References 25 publications

Mining stress formation and distribution: Predictive model based on overburden key strata structure

Mining stress formation and distribution: Predictive model based on overburden key strata structure

Breaking and Instability Movement Characteristics of High-Position Double-Layer Hard Thick Strata due to Longwall Mining

Excavation-induced deformation and damage evolution of deep tunnels based on a realistic stress path

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