Longwall surface subsidence control by technology of isolated overburden grout injection

Xuan, Dayang; Xu, Jialin

doi:10.1016/j.ijmst.2017.07.014

Cited by 60 publications

(40 citation statements)

References 14 publications

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“…The bed separation zone grout injection technique 22 injects filling material through boreholes from the ground surface to the bed separation zone, which is suitable for single coal seam mining. Zhu et al 4 made a comparison among existing technologies.…”

Section: Discussionmentioning

confidence: 99%

“…15 22 to ensure that rural structures are suitable for habitation. The filling rate was also considered, which is closely related to the expansion characteristics of filling material.…”

Section: Design Principlementioning

confidence: 99%

“…However, abandoning these underground resources also places economic pressure on the planning and development of coal enterprises. 12,20 To prevent rock deformation and control surface subsidence, mine backfilling technology delivers material (including fly ash, gangue, or a compound slurry) to the gob area, 14 zone, 12,13,22 and caving zone. Numerous studies have attempted to address this problem [1][2][3][4][5][6] and to estimate the influence 7 with different methods.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a better technique is urgently needed to effectively control mining-induced surface subsidence and ensure sustainable development of coal resources. 23 These methods consist of gob filling, 24,25 bed separation zone grout injection, 12,13,22,24 piercolumn backfilling, 4,23 and caving zone filling. 8 Backfilling mining technology is a well-known technique for controlling surface deformation widely used in China and other Asian countries, 9 Poland, 10,11 and Australia [12][13][14][15] ; it solves the problem of gangue accumulation, 16,17 improves the resource recovery rate, 18,19 controls surface subsidence, 2,20 and protects buildings from collapse damage.…”

Section: Introductionmentioning

confidence: 99%

“…8 Backfilling mining technology is a well-known technique for controlling surface deformation widely used in China and other Asian countries, 9 Poland, 10,11 and Australia [12][13][14][15] ; it solves the problem of gangue accumulation, 16,17 improves the resource recovery rate, 18,19 controls surface subsidence, 2,20 and protects buildings from collapse damage. 16,22 Furthermore, the bed separation zone grout injection technique, one type of partial filling technology, has rapidly developed. 23 These methods consist of gob filling, 24,25 bed separation zone grout injection, 12,13,22,24 piercolumn backfilling, 4,23 and caving zone filling.…”

Section: Introductionmentioning

confidence: 99%

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A novel short‐wall caving zone backfilling technique for controlling mining subsidence

Liu

Zhu

et al. 2019

Energy Science & Engineering

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Mining‐induced voids are the main circulation pathways for underground fluids such as water and coalbed methane. The collapse of these voids transmits to the ground surface, resulting in subsidence and building collapse. Accordingly, effective and feasible solutions are needed to control surface subsidence. In this study, a novel technique of void filling in the short‐wall caving zone was proposed to better control surface subsidence in thin coal seam mining. The width of the working face plays a key role in the proposed technique. A maximum surface subsidence value was predicted using numerical simulation and physical simulation experiments with different working face widths. The results indicate that the appropriate working face width should be less than 50 m for the studied coal mine. In this example, the surface subsidence coefficient was less than the standard value for initial damage to rural structures. Both advancing speed and productivity of the working face were achieved using the proposed technique because the filling and mining processes were conducted simultaneously on different faces. The results suggest that surface subsidence during thin coal seam mining could be controlled using the proposed technique. This technique can also help mitigate mining‐induced water inrush and gas leakage disasters by filling voids.

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Section: Discussionmentioning

confidence: 99%

“…15 22 to ensure that rural structures are suitable for habitation. The filling rate was also considered, which is closely related to the expansion characteristics of filling material.…”

Section: Design Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A novel short‐wall caving zone backfilling technique for controlling mining subsidence

Liu

Zhu

et al. 2019

Energy Science & Engineering

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Subsurface strata failure and movement based for improving gas emission control: Model development and application

Cheng

Wang

Liu

et al. 2020

Energy Science & Engineering

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In underground mining operations, the overlying strata move, deform, and crack as the underground working face advances due to strata breakage, failure, and subsidence, forming a “vertical three zone” over the mined out area. The permeability of strata under mining changes differently in different zones. Therefore, studying the distribution of strata permeability is very important to obtain knowledge of gas migration pattern in the overlying strata in order to increase the gas extraction efficiency. In this study, a series of numerical models are developed to describe the overlying strata movement for three different zones. In detail, models for calculating the strata subsidence for fracture and bending zones and analyzing strata collapsing development for the caving zone are proposed based on the influence function method and mechanical analyses. In addition, on the basis of such models, a new comprehensive model to describe the strain‐porosity‐permeability of strata is developed. In the case study of applying such models in an underground mine, the reliability of the strata movement model is verified and the permeability change is also calculated, which gives a good guidance to design the location of gas drainage roadway practices in the future. The field engineering practice shows its good application.

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Failure prediction from crack evolution and acoustic emission characteristics of coal-rock sandwich composite samples under uniaxial compression

Tan

Liu

et al. 2022

Bull Eng Geol Environ

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Longwall surface subsidence control by technology of isolated overburden grout injection

Cited by 60 publications

References 14 publications

A novel short‐wall caving zone backfilling technique for controlling mining subsidence

A novel short‐wall caving zone backfilling technique for controlling mining subsidence

Subsurface strata failure and movement based for improving gas emission control: Model development and application

Failure prediction from crack evolution and acoustic emission characteristics of coal-rock sandwich composite samples under uniaxial compression

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