An approximate analysis of floor heave occurring in roadways behind advancing longwall faces

Sheorey, P.R.; Dunham, R.K.

doi:10.1016/0148-9062(78)91468-7

Cited by 7 publications

(1 citation statement)

References 5 publications

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“…Surface compression ridges are described in studies of mining subsidence [ Whittaker and Reddish , 1989]. Uplift of the reservoir floor in high‐T/D models mimics “floor heave” or “floor lift” in mines, which, under dry conditions, is an elastic or viscoelastic response to low pressure within the mine versus high overburden‐derived pressure within the mine walls and floor [ Afrouz , 1975; Sheorey and Dunham , 1978]. Seismicity at Rabaul caldera, Papua New Guinea, defines a ring fault system that seems to enclose a major horizontal discontinuity [see Jones and Stewart , 1997, Figure 7].…”

Section: Discussionmentioning

confidence: 99%

Mechanical and geometric controls on the structural evolution of pit crater and caldera subsidence

2011

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[1] Pit craters and calderas are volcanic depressions produced by subsidence of a magma reservoir roof. To identify how geometric and mechanical factors may influence the structural evolution of this subsidence, we used two-dimensional distinct element method numerical models. The reservoir host rock was represented as an assemblage of bonded circular particles that interact according to elastic-frictional laws. Varying particle and bond properties produced a range of bulk material properties characteristic of natural rock masses. Fracturing results when bonds break, once their shear or tensile strength is exceeded. The magma reservoir was represented as a region of nonbonded low-friction particles. Withdrawal of magma was simulated by incrementally reducing the area of the reservoir particles. Resultant gravity-driven failure and subsidence of the reservoir roof were explicitly replicated. Interaction of the roof's strength, Young's modulus, thickness/diameter ratio (T/D), and the reservoir's shape yields a variety of model structures and subsidence styles. In conceptual terms, four end-member subsidence styles developed: (1) "central sagging" favored by low strength and low T/D; (2) "central snapping" favored by high strength, low T/D, and a sill-like reservoir shape; (3) "single central block" favored by low to intermediate strength, high Young's modulus, and intermediate T/D; and (4) "multiple central blocks" favored by high strength, low Young's modulus, and high T/D. Most model realizations incorporated some combination of each style, however. The models provide a geomechanical framework for understanding natural pit crater or caldera structures, as at Nindiri (Nicaragua), Fernandina (Galapagos), Dolomieu (La Reunion), and Miyakejima (Japan).

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Section: Discussionmentioning

confidence: 99%

Mechanical and geometric controls on the structural evolution of pit crater and caldera subsidence

2011

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Floor Heave Mechanism and Control Technique of Water‐Rich Soft‐Rock Roadway in Thick Coal Seam

He,

Zhai,

Liu

et al. 2024

Energy Science & Engineering

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The severe deformation of the surrounding rock of the coal floor in Shanghaimiao mining area is affecting the safe, efficient production of mine wells in this region. In this study, the heave mechanism and control of the roadway floor were investigated through laboratory experiments, field research, theoretical analysis, numerical simulation, and on‐site testing. The results showed that the main reason for the serious damage to the roadway floor was the low strength of the surrounding rock of the roadway floor, and floor damage was exacerbated by the low support strength, hydraulic effects, and mining impact. A mechanical model of the asymmetric floor heave was established, and it was found that the stability of the roadway floor was positively correlated with the floor rock type, the stress concentration coefficients on the two sides of the roadway, and the burial depth, whereas it was negatively correlated with the cohesive force and internal friction angle of the floor rock mass. Expressions for the upward resultant force R of the roadway floor and the stress concentration coefficients K and K′ on both sides of the roadway were derived. The results of a FLAC3D numerical simulation analysis showed that the stress peak in front of the working face was 36 MPa, with a stress concentration factor of 3.7. After the floor support was reinforced, the floor heave was remarkably reduced, with a maximum value of approximately 600 mm, and the floor deformation became somewhat asymmetric. Finally, a double‐seal floor‐reinforcing “inverted arch” control technique was proposed and tested on‐site. The new system could efficiently and stably support the surrounding rock of the roadway.

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Estimation of in situ viscoelastic parameters of weak floor strata by plate-loading tests

Chen

Chugh

1996

Geotech Geol Eng

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An approximate analysis of floor heave occurring in roadways behind advancing longwall faces

Cited by 7 publications

References 5 publications

Mechanical and geometric controls on the structural evolution of pit crater and caldera subsidence

Mechanical and geometric controls on the structural evolution of pit crater and caldera subsidence

Floor Heave Mechanism and Control Technique of Water‐Rich Soft‐Rock Roadway in Thick Coal Seam

Estimation of in situ viscoelastic parameters of weak floor strata by plate-loading tests

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