Further development of the roof strata tilt concept for pack design and the estimation of stress development in a caved waste

Smart, Brian George Davidson; Haley, Steven M.

doi:10.1016/s0167-9031(87)90355-0

Cited by 35 publications

(19 citation statements)

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“…Figure 10 shows the variation law of tensile failure area and tensile failure depth of roof. It can be seen that: (1) When the retained entry width increases from 2.5 m to 4.5 m, the roof tensile failure depth increases from 0.5 m to 1.5 m while the roof tensile failure area increases from 1 m 2 to 3.5 m 2 .…”

Section: Roof Plastic Zone Distribution Of Ger-lmh With Respect To Rementioning

confidence: 98%

“…Gob-side entry retaining (GER) was tested and applied in the UK, Germany, Poland, and Russia in the past few decades, while GER is widely applied in coal mining in China [1][2][3][4][5][6][7]. GER is a safe, green and efficient mining technology with advantages including reduced excavation rates, relief of the rapid movement of mining activities, improved coal recovery rates and settling of corner gas accumulation, lowered panel temperatures and optimized working environments [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Stability Control for Gob-Side Entry Retaining with Supercritical Retained Entry Width in Thick Coal Seam Longwall Mining

Zhang

et al. 2019

Energies

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Taking gob-side entry retaining with large mining height (GER-LMH) of the 4211 panel in the Liujiazhuang coal mine as the engineering background, a numerical simulation was conducted to study the surrounding rock deformation, stress, and plastic zone distribution of GER-LMH with respect to retained entry width. The concept of critical retained entry width of GER-LMH was proposed. In view of the deformation characteristics of surrounding rock, an innovative approach to determine the critical width of GER-LMH based on the cusp catastrophe theory was proposed. The cusp catastrophe functions were set up by approximate roadside backfill body rib convergence and roof subsidence series with respect to different retained entry widths. The critical retained entry width of GER-LMH was 4.0 m according to bifurcation set equations. Surrounding rock stability control principle and technique of GER-LMH was proposed, including “rib strengthening and roof control”: road-in support with high pre-stress rockbolts and anchor cables, roadside backfill body construction technology with high-water quick consolidated filling materials and counter-pulled rockbolt, road-in reinforced support technology with hydraulic prop support and roof master. Field test and field monitoring results show that GER-LMH with supercritical retained entry width in the 4211 panel could meet the requirements for ventilation when the 4211 panel was retreating.

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Section: Roof Plastic Zone Distribution Of Ger-lmh With Respect To Rementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Stability Control for Gob-Side Entry Retaining with Supercritical Retained Entry Width in Thick Coal Seam Longwall Mining

Zhang

et al. 2019

Energies

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“…Research on gob-side entry retention problems in China began in the 1950s. Smart and Haley (1987) proposed a roof-beam tilt theory and indicated that the roof slant angle and position of the rotator pivot are two important parameters in roadside support design. The researchers posited that roadside support most likely controls the main roadway roof and recommended controlling the roof slant angle to maximize the working resistance and yielding ability of the roadside support.…”

mentioning

confidence: 99%

Surrounding rock control mechanism in the gob-side retaining entry in thin coal seams, and its application

Zhang

et al. 2018

J. S. Afr. Inst. Min. Metall.

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“…at a distance of 0.12H (Smart and Haley, 1987). These researchers mostly assumed that the stress in the goaf increased linearly.…”

mentioning

confidence: 99%

“…The corresponding distance of cover stress re-establishment is generally described in terms of the cover depth of the coalbed modified with a coefficient (King and Whittaker, 1970;Choi and McCain, 1980;Wilson, 1983;Smart and Haley, 1987;Mark, 1990). However, due to the complex process of compression deformation of the caved materials in the goaf, it is proposed here that the cover stress re-establishment may follow a more complex rule than that of a linear function.…”

mentioning

confidence: 99%

A analytical model for cover stress re-establishment in the goaf after longwall caving mining

Wang

Jiang

Wang

et al. 2017

J. South. Afr. Inst. Min. Metall.

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Cover stress re-establishment has a significant influence on the deformation and development of permeability in the fractured rock mass, which control the surface subsidence and water inflow after longwall caving mining. This paper reviews previous studies on cover stress reestablishment in the goaf after coal mining, and proposes a new analytical model based on the stress-strain characteristics of the caved rock mass and the voussoir beam theory. A scale model test is also conducted to study the cover stress re-establishment based on a coal mining case. A function was derived for cover stress re-establishment in the goaf, which can be approximately described as a logarithmic function and which agreed well with two completely re-established monitoring sites from the scale model test. The scale model test also indicated that cover stress reestablishment presents a hysteresis phenomenon. A 'stress balance' model was built for calculating the distance of cover stress re-establishment in the goaf, and the result from the model was lower than the results from the previous two methods. The cover stress re-establishment function and the 'stress balance' model will be of great significance for better understanding the stress distribution in the goaf. longwall mining, goaf, caving, fracturing, cover stress re-establishment, calculation model.

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Further development of the roof strata tilt concept for pack design and the estimation of stress development in a caved waste

Cited by 35 publications

References 1 publication

Stability Control for Gob-Side Entry Retaining with Supercritical Retained Entry Width in Thick Coal Seam Longwall Mining

Stability Control for Gob-Side Entry Retaining with Supercritical Retained Entry Width in Thick Coal Seam Longwall Mining

Surrounding rock control mechanism in the gob-side retaining entry in thin coal seams, and its application

A analytical model for cover stress re-establishment in the goaf after longwall caving mining

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