Research and application of strip mining of village coal pillar at coal field of the north of the Yellow River in Shandong Province

Xu, Na; Tian, Jin-zhou; Gao, Chao

doi:10.1007/s12404-012-0302-x

Cited by 8 publications

(7 citation statements)

References 4 publications

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“…The strip filling mining technique mitigates surface subsidence by managing the principal key layer, and its underlying principle can be encapsulated as follows [19]: by utilizing strip filling bodies to supplant the coal pillars left in strip mining, and ensuring that the width of the unfilled goaf remains less than the initial breaking span of the main key layer of the overlying rock, the structural integrity of the main key layer is maintained. Consequently, the filling strip can achieve long-term stability, effectively controlling surface subsidence.…”

Section: Goaf Strip Filling Mining Techniquementioning

confidence: 99%

Quantitative Characterization and Disturbance Law of Key Parameters Influencing Deformation of Overlying Strata during Strip Filling in a Goaf

Zhao,

Meng,

et al. 2024

Applied Sciences

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Strip filling mining in a goaf is of great significance for solving the ‘three under’ coal-pressure and mining-area ecological environment problems in Central and Eastern China, but the disturbance characteristics of filling parameters on overlying rock are not clear at present. Taking the geological conditions of the CT30101 working face in Mahuangliang coal mine and the short-wall interval strip filling as a background, the strength parameters (cohesion and friction angle), deformation parameters (elastic modulus and Poisson’s ratio), and structural parameters (strip width and spacing) of the filling body were selected as experimental factors, and the maximum settlement of the direct roof and the ground surface was taken as the evaluation index. The influence degree of each factor was quantitatively characterized via a variance analysis and an F test, and the main control factors of the strip filling overburden settlement were proposed. The roof and surface displacement, the stress evolution law of the filling body, and the shape change of the surrounding rock plastic zone under different levels of main control factors in the entire process of mining filling coupling were analyzed in detail. The results showed that the cohesion of the backfill had a highly significant impact on the direct roof settlement, the strip spacing and the friction angle of backfill had a significant impact on it, the cohesion of the backfill and the strip spacing had a certain impact on the surface settlement, and the two had a cross-coupling effect. In the process of mining and filling, the stress evolution of the filling body was extremely complex, and it finally presented a saddle shape that was high on both sides and low in the middle; the majority of the strata and the filling body primarily exhibited shear damage, with a small amount of tensile failure zones appearing only in the direct roof and mid-section of the filling body. The above conclusions have a certain guiding significance for the optimal design of strip filling in a goaf.

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Section: Goaf Strip Filling Mining Techniquementioning

confidence: 99%

Quantitative Characterization and Disturbance Law of Key Parameters Influencing Deformation of Overlying Strata during Strip Filling in a Goaf

Zhao,

Meng,

et al. 2024

Applied Sciences

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“…During mining activities, if the goaf is left behind it will lead to a series of secondary disasters, such as groundwater depletion, surface collapse, house cracking, road cracking, ecological deterioration, and it can destroy the balance of the geological environment in the coal goaf [1][2][3][4][5][6]. The management of the goaf and its secondary disasters is an extremely complicated problem [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Partial backfill mining is similar to total backfilling; however, the backfilling volume and range are only a part of the extracted coal volume and only fill part of the separation area of the goaf and the roof fall area [4,[17][18][19][20][21]. This method relies on the overburden key stratum structure, filling body, and part of the coal column to support the overburden rock and control mining subsidence.…”

Section: Introductionmentioning

confidence: 99%

“…This method relies on the overburden key stratum structure, filling body, and part of the coal column to support the overburden rock and control mining subsidence. Based on the different backfilling locations, partial backfilling can be subdivided into three methods: backfilling of paste strips in the mining void area, isolated slurry backfilling in the overburden delamination zone, and slurry backfilling in the strip mining subsidence area [4,[22][23][24]. Paste strip backfilling uses a paste material to fill part of the space in the goaf before the roof falls after the coal seam has been mined, to construct interphase backfilling strips, which are used to support the overlying rock [21].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Effectiveness of a New Backfilling Method: “Multi-Arch Pier-Column”

Fan

et al. 2022

Energies

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Owing to the shortcomings of blindness and inaccuracy when backfilling in goafs and based on the key stratum theory, we propose the “multi-arch pier-column” backfilling method. This method involves drilling holes at specific locations on the surface to inject filling and slurry materials into the goaf and separation area under the key stratum. This allows the broken gangue to be cemented to form a stone body, to improve its overall strength. This process, along with filling in the separation area under the key stratum, ensures that the key stratum does not break, forming a joint medium of “separation area filling body + backfilled pier-columns + key stratum + coal column”, which prevents new subsidence on the surface layer. Using the Gaojialiang coal mine as an example, the effects of the proposed method on controlling surface subsidence were determined using a numerical simulation based on FLAC3D simulation software. The results indicate that this method can effectively control the key stratum and ensure that the surface subsidence is within a safe range. The multi-arch pier-column backfilling method utilises the self-bearing capacity of the overburden structure and greatly reduces the backfilling workload and the cost of backfilling for controlling surface subsidence. At present, the multi-arch pier-column system of the new backfill method is an unexplored and new area of research.

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“…These include strip mining (Guo et al , 2016Zhang et al 2011a, b;Xu et al 2012), harmonic mining (Yu et al 2004), and backfill mining (Guo et al 2009(Guo et al , 2014Huang et al 2011;Zha et al 2011;Xu et al 2013;Zhang et al 2014Zhang et al , 2015. The basic practice of strip mining divides the areas to be exploited into formal stripped shapes.…”

Section: Introductionmentioning

confidence: 99%

Mining scheme design for super-high water backfill strip mining under buildings: a Chinese case study

Guo

Zhai

2016

Environ Earth Sci

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Considerable coal resources are buried under buildings in No. 5 mining area of Hengjian Coal Mine, which greatly shortens its service life. Working on the premise that the degree of mining-induced damage to surface buildings should not exceed the protective indicator, the mine proposes to use super-high water backfill technology so as to ensure maximum exploitation of these resources. However, according to monitoring of observations of surface movement in the first-mined 2515 working face, mining-induced damage to the surface buildings will exceed level I if this technology is also used to exploit other working faces. A technology combining super-high water backfilling with strip mining is proposed. Numerical simulation is used to study the influence of different retaining pillar widths on surface subsidence characteristics. A reasonable design of these combined technologies is achieved based on the numerical simulation and theoretical analysis. Predicted results indicate that the designed scheme can ensure the safety of the surface buildings. These research results provide a reasonable and reliable technical solution for mining of coal resources buried under buildings.

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Research and application of strip mining of village coal pillar at coal field of the north of the Yellow River in Shandong Province

Cited by 8 publications

References 4 publications

Quantitative Characterization and Disturbance Law of Key Parameters Influencing Deformation of Overlying Strata during Strip Filling in a Goaf

Quantitative Characterization and Disturbance Law of Key Parameters Influencing Deformation of Overlying Strata during Strip Filling in a Goaf

Investigation of the Effectiveness of a New Backfilling Method: “Multi-Arch Pier-Column”

Mining scheme design for super-high water backfill strip mining under buildings: a Chinese case study

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