Improving Short- and Long-term Stability of Underground Gypsum Mine Using Partial and Total Backfill

Heib, Mohamed Marwan Al; Didier, Christophe; Masrouri, Farimeh

doi:10.1007/s00603-009-0066-9

Cited by 33 publications

(16 citation statements)

References 14 publications

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“…For gypsum with similar uniaxial compressive strength of about 10 MPa and tensile strength of about 1 MPa, Heib et al (2009) report a friction angle of about 41.5°.…”

Section: Methodsmentioning

confidence: 95%

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Deformation field evolution in indentation of a porous brittle solid

Yadav

Saldaña

Murthy

2015

International Journal of Solids and Structures

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a b s t r a c tAn experimental study of plane strain wedge indentation of a model porous brittle solid has been made to understand the effect of indentation parameters on the evolution of the deformation field and the accompanying volume change. A series of high-speed, high-resolution images of the indentation region and simultaneous measurements of load response were captured through the progression of the indentation process. Particle image velocimetry analysis of the images facilitated in situ measurement of the evolution of the resulting plastic zone in terms of incremental material displacement (velocity), strain rate, strain and volume change (e.g., local pore collapse). These measurements revealed initiation and propagation of flow localizations and fractures, as well as enabled estimate of volume changes occurring in the deformation zone. The results were directly compared with theoretical estimates of indentation pressure and deformation zone geometry and were used to validate a modified cavity expansion solution that incorporates effects of volume changes in the plastic zone.

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“…For gypsum with similar uniaxial compressive strength of about 10 MPa and tensile strength of about 1 MPa, Heib et al (2009) report a friction angle of about 41.5°.…”

Section: Methodsmentioning

confidence: 95%

“…(6), where r is the radius of elasto-plastic boundary, normalized with respect to instantaneous contact radius of the indenter, K p is the passive coefficient provided and / the friction angle (41.5°from Heib et al (2009)). Further, the radius of the cavity is given by Eq.…”

Section: Cavity Expansion Modelmentioning

confidence: 99%

Deformation field evolution in indentation of a porous brittle solid

Yadav

Saldaña

Murthy

2015

International Journal of Solids and Structures

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“…At the same time, strip filling mining has overcome the shortcomings of a low coal mining rate, with more than 90% of coal accounted for. [17][18][19] The similar material simulation test is an effective method to study practical problems in mining engineering. Physical models, consisting of sand and plaster and obeying relevant similarity rules, were used to investigate the subsidence mechanisms from the sequential extraction of overlapping coal longwall panels.…”

Section: Introductionmentioning

confidence: 99%

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Ning

Wang

Pan

et al. 2020

Energy Science & Engineering

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The strip filling mining method can solve the problems related to mining under structures, under aquifers, and under infrastructure (3U coal seams), while the reasonable selection of the mining and filling sequence still requires further investigation. The current study was conducted to investigate the stress and surface subsidence of a filling body (or coal pillar) under two filling sequences through theoretical analysis, similar simulation tests, and numerical simulations. To achieve optimal filling materials for the Liudong Coal Mine, a low-strength similar paste filling material composed of fly ash, gypsum, and sand was developed. The relationships between the strength and the cement ratio and between the strength and the sand-binder ratio were discussed. Similar simulation tests showed that mining scheme 1 (mining before filling) could lead to the formation of an isolated island coal pillar in the mining process, mining scheme 2 (filling before mining) had less influence on surface subsidence, and the stress on the filling body was smaller for scheme 2 than for scheme 1. The distributions of the stress and plastic zone in the two different mining and filling sequences were obtained through numerical simulations. The method of first filling and then mining could greatly reduce the stress concentration and plastic zone during the mining process. In summary, mining scheme 2 (filling before mining) can avoid the formation of isolated island coal pillars in the process of mining, and without considering other factors, scheme 2 should be adopted as much as possible.

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“…After compacting by the compactor of the shield [9], the backfill body would have full contact with the roof, thus, it can be seen as a supporting structure. Once in place, it will sustain the load of overburden above the gob, and further, restrict the sagging of the immediate and the main roofs, and prevent them from fracturing and caving.…”

Section: Overburden Deformation Characteristics In Coal Mining With Cmentioning

confidence: 99%

Analysis on Filling Ratio and Shield Supporting Pressure for Overburden Movement Control in Coal Mining with Compacted Backfilling

Huang

Song

et al. 2016

Energies

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Abstract:Since the weight of overburden is sustained by both the backfill body and the unmined solid coal in coal mining with compacted backfilling (CMCB) panels, the stress and deformation characteristics of the surrounding rocks in coal mining are radically changed. The overburden movement control mechanism by coordinating with backfill body and shield in CMCB was studied systematically in this paper. Based on the analysis of deformational and structural characteristics of surrounding rock in CMCB panels, the methods of theoretical analysis, numerical simulation and engineering test are employed. The results show that the fracture of the main roof is mainly controlled by the filling ratio ϕ and is non-correlated to the shield supporting pressure p. However, p has a significant control effect on the deflection of roof within the shield canopy length, and adversely affects the filling ratio. With the increase of the filling ratio of the gob, the maximum sagging of the immediate and the main roofs, the peak front and the influence range of the abutment pressures are gradually reduced. Correspondingly, the stable period of internal pressure of backfill body in the gob is shortened. Engineering practice shows that the sagging of the gob roof, the distribution of the abutment pressure, the distribution of the internal pressure in the backfill body, and the ground surface sagging results obtained by the in-situ measurement are approximately corresponding to the theoretical analysis and numerical simulation results.

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Improving Short- and Long-term Stability of Underground Gypsum Mine Using Partial and Total Backfill

Cited by 33 publications

References 14 publications

Deformation field evolution in indentation of a porous brittle solid

Deformation field evolution in indentation of a porous brittle solid

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Analysis on Filling Ratio and Shield Supporting Pressure for Overburden Movement Control in Coal Mining with Compacted Backfilling

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