Wide Strip Backfill Mining for Surface Subsidence Control and Its Application in Critical Mining Conditions of a Coal Mine

Cao, Wenhao; Wang, Xufeng; Peng, Li; Zhang, Dongsheng; Sun, Chuang; Qin, Dongdong

doi:10.3390/su10030700

Cited by 29 publications

(23 citation statements)

References 25 publications

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“…From the field observation, no obvious cracks were found on the surface and buildings after the implementation of roadway backfill mining. This proves that this mining method can effectively protect surface buildings and the ecoenvironment, as do other similar cases [37,38].…”

Section: Analysis Of Surface Subsidencesupporting

confidence: 54%

Roadway Backfill Mining with Super-High-Water Material to Protect Surface Buildings: A Case Study

et al. 2019

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As coal resources trapped under surface buildings in the Wangtaipu coal mine area impede the efficient mining of coal seams and constrain the sustainable development of coal mines, a super-high-water roadway backfill mining technique for preventing building damage was adopted. According to the control principle and theoretical calculations, an engineering design was established including the reasonable width of segment coal pillars in the working face and technical parameter design. The monitoring results after the implementation of the scheme showed that building deformation was controlled within grade I, protecting the surface buildings. A reasonable roadway design parameter was achieved, with a surface subsidence of 27 mm and horizontal deformation of 0.3 mm/m, indicating that it can ensure the safety of surface buildings from the State Bureau of Coal Industry. The practical trial can provide a reference for the extraction of coal resources under similar conditions and is vital for the sustainable development of the mining industry and economic growth. This is because the remaining coal pillar can usually support the overburden load, allowing slight surface movement and deformation. Although the strip mining or room mining method has reduced surface subsidence or damage to a certain extent, the mining rate is low due to the coal pillars. Because the harmonic mining is limited by many factors, such as construction organization, geological conditions, and subsidence factor, it is difficult to realize. Meanwhile, grouting injection technology has been successfully applied to reduce surface subsidence and building damage in populated areas. Alehossein [16] studied shear behaviour of the slurry through field and laboratory testing, and derived formulas for minimum pump pressure and local pressure, and the results are consistent with each other. Shen and Poulsen [17] used numerical modeling to study the evolution of horizontal fractures at bed separations during longwall mining. By analyzing the influence of filling ratio and maximum subsidence on the grouting effect, Xuan and Xu [18] obtained the supporting width that was formed at the center of the gob. Subsequently, the stiffness and distribution of the grouting mass were investigated through field borehole, and the mechanism of grouting to restrain the overburden deformation was revealed [19]. Considering the long-term stability of overburden, the effect of harmonic mining and grouting injection on overburden damage reduction is poor. In fact, the essential problem of "under-three" mining is controlling the movement and deformation of the overlying strata. By contrast, backfill mining has been widely used and is becoming an effective technique for reducing the degree of overburden failure in the green mining technical system, and has been developed to solve the global problems described above, especially for "under-three" mining [20][21][22][23]. In essence, backfill mining reduces the overburden movement by replacing the coal with backfill material. Meanwhile, ...

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Section: Analysis Of Surface Subsidencesupporting

confidence: 54%

Roadway Backfill Mining with Super-High-Water Material to Protect Surface Buildings: A Case Study

et al. 2019

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“…SBM can be implemented to protect aquifers and reduce surface subsidence effectively as soil and water loss are serious in the mining area of the northern Shaanxi province; this would also help realize coal mining with water conservation [12][13][14][15]. The SBM technology is, thus, a potential solution to the above challenges.In recent years, research on strip backfilling mining of small and medium-sized mines in China's northern Shaanxi province has been gradually increasing [16][17][18][19][20][21]. Several scholars have studied the stability of coal pillars and overburden in SBM [22][23][24][25].…”

mentioning

confidence: 99%

“…In recent years, research on strip backfilling mining of small and medium-sized mines in China's northern Shaanxi province has been gradually increasing [16][17][18][19][20][21]. Several scholars have studied the stability of coal pillars and overburden in SBM [22][23][24][25].…”

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confidence: 99%

Study on the Pressure-Bearing Law of Backfilling Material Based on Three-Stage Strip Backfilling Mining

Shao

Wang

et al. 2020

Energies

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During strip backfilling mining in coal mines, the backfilling material is the main support structure. Therefore, studying the pressure law of the backfilling material is essential for the safe and efficient mining of coal resources. Based on research into strip backfilling mining at working face number 3216 of the Shanghe Coal Mine, and to smooth transition of overlying strata loads to the backfilling material, this study proposes a three-stage strip backfilling mining method. Based on thin-plate theory, an elastic thin-plate model, a reasonable spacing of strip mining is constructed, and the reasonable mining parameters of “mining 7 m to retain 8 m” at working face number 3216 of the Shanghe Coal Mine are determined. The law of backfilling pressure in three-stage strip backfilling mining is studied through numerical simulation and physical simulation experiments. The results show that field measurement results are basically consistent with the experimental results and numerical simulation results. When three-stage strip backfilling mining is adopted, the stage-one backfilling material is the main bearing body to which the overlying rock load transfers smoothly and gradually, and the structure of the “overburden-coal pillar (or backfilling strip)” in the stope remains stable. In three-stage strip backfilling mining, the overlying rock load is ultimately transferred to the stage-one backfilling material, the stage-two backfilling material is the auxiliary bearing body, and the stage-three backfilling material mainly provides long-term stable lateral support for the stage-one backfilling material.

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“…As such, the purpose of the investigations reviewed in this article is to clarify the behaviour of the buildings located towards the center of the basin, which are affected by the underground mining of the thick coal seams with low dips, in the event of future extraction of the coal reserves from the main safety pillars or following an instance where the limits of these pillars are accidentally exceeded. The geo-mining conditions introduced in the numerical models are extreme ones that can occur only in the case of practicing roof control by caving of integral rocks [6], and less so in conditions of total stowing (filling) of the gob [7][8][9] (which will apply only in the event of a future decision to exploit the main safety pillars). The post-mining area can be filled with a hydraulic, dry, or paste filling.…”

Section: Introductionmentioning

confidence: 99%

“…The prognosis and the study of the deformations of the lands affected by the underground mining can be done with the aid of empirical methods (profile functions and influence functions); physical models (based on rock like or optically active materials); analytical models (plate and beam theory [7], etc. )); and numerical models (finite element, finite difference, boundary element, and distinct element methods [19][20][21]).…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the State of Stresses on the Structures of Buildings Influenced by Underground Mining of Hard Coal Seams in the Jiu Valley Basin (Romania)

et al. 2020

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The hard coal seams in the Jiu Valley mining basin have been mined with different mining methods and technologies, including with the complete caving of the surrounding rocks and with top coal caving. These mining systems have led to the degradation of the ground surface by producing subsidence of the land, ranging from a few meters up to tens of meters, in the areas with thick coal seams with high dips. When the limits of the main safety pillars are accidentally exceeded whilst mining, buildings situated either below the ground or on the surface are affected. In the future, the possibility exists of mining some of the very large reserves that are immobilized in the main safety pillars, where the gentle dip seams are stored. In consideration of the above, in order to study the behaviour of typical buildings that are under the influence of underground mining and to develop a model of the stress state in the structural elements of the structures, finite element modelling is used. As such, several modelled buildings with one, two, and three levels were generated, as well as buildings with two levels and with different lengths. These buildings were built of reinforced concrete panels or brick masonry and were subjected to the mining influence of a panel specific to the mines in the Jiu Valley basin, sequentially extracted with a longwall coal face method at different operating heights, with the use of roof control by caving of rocks and with top coal caving methods. Following the analysis of the major principal (tensile) stresses and minor principal (compressive) stresses, a series of conclusions regarding the behaviour of these buildings that are under the influence of the underground mining is revealed. In this context, it was concluded that the value and location of the stresses developed in the structure of the buildings depend mainly on the extension of the panel and the volume of the goaf, the relative position of the building in respect to the coal face line, and the length of the building.

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Wide Strip Backfill Mining for Surface Subsidence Control and Its Application in Critical Mining Conditions of a Coal Mine

Cited by 29 publications

References 25 publications

Roadway Backfill Mining with Super-High-Water Material to Protect Surface Buildings: A Case Study

Roadway Backfill Mining with Super-High-Water Material to Protect Surface Buildings: A Case Study

Study on the Pressure-Bearing Law of Backfilling Material Based on Three-Stage Strip Backfilling Mining

Finite Element Analysis of the State of Stresses on the Structures of Buildings Influenced by Underground Mining of Hard Coal Seams in the Jiu Valley Basin (Romania)

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