Soil and water conservation in mining area based on ground surface subsidence control: development of a high-water swelling material and its application in backfilling mining

Wang, Ailong; Ma, Liqiang; Wang, Zhongwei; Zhang, Dongsheng; Li, Ke; Zhang, Yao; Yi, Xingjun

doi:10.1007/s12665-016-5577-6

Cited by 28 publications

(28 citation statements)

References 34 publications

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“…Properties of these seven materials, including the strength and the elastic modulus, were estimated. The specimens were cast by pouring the mixed paste filling-material into a standard specimen mold (ϕ50 mm × 100 mm) for adequate compaction until they became solid for UCS tests [30]. As shown in Figure 8, in the first 7 days, the strength of the sample showed a rapid increase with the growth of the solidification time, while the increase rate of the strength revealed significant decrease from the time period that specimens had been cured from 7 days to 14 days.…”

Section: Parameters Of Filling Materialsmentioning

confidence: 99%

“…Table 2. Geological and mining parameters to calculate roof sinking amount in CECB [27,30]. According to the Equations (15) and (17) as well as the parameters listed in the Tables 1 and 2, the maximum loads on the coal pillars and the filling bodies could be estimated.…”

Section: Parameters Of Filling Materialsmentioning

confidence: 99%

“…Backfilling materials were formulated by using the recipe of mixing with these aggregates, cementing materials and water. In addition, with the requirements on the pipeline transportation, as well as the ground subsidence control in field applications, laboratory tests were conducted to measure properties of the backfilling material, such as the solidification rate, fluidity and strength [30]. In the CECB method, there are three different stages of supporting mechanisms, that of: changing from coal pillars support, to the combination of coal pillars and filling bodies support, to the filling bodies support [31].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Roof Ground Subsidence While Applying a Continuous Excavation Continuous Backfill Method in Longwall Mining

Zhang

2019

Energies

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Activities of traditional longwall mining will result in ground subsidence and therefore cause issues such as damages to buildings and farmlands, water pollution and loss, and potential ecological and environmental problems in the mining region. With advantages of the longwall backfill mining method, as well as the room and pillar mining method, a continuous excavation and continuous backfill (CECB) method in longwall mining is recommended to effectively control the ground subsidence. In this method, mining roadways (MRs) are initially planned in a panel, and then they are excavated and backfilled in several stages until the whole panel is mined out and backfilled. According to the geologic conditions of an underground coal mine, and the elastic foundation beam theory, a mechanical model was built to study the subsidence of the roof while using this new mining method. In addition, methods to calculate roof subsidence in various stages in CECB were also provided. The mechanical parameters of backfilling materials, which were used in the theoretical calculation and the numerical analysis for mutual check, were defined through analyzing the stability conditions of the coal pillars and the filling bodies. The control effect for the ground subsidence of using the newly proposed mining method was analyzed based on both simulation results and site monitoring results, including the ground subsidence, horizontal displacement, tilt, curvature and horizontal strain. This research could provide suggestions to effectively control ground subsidence for a mine site with similar geologic conditions.

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Section: Parameters Of Filling Materialsmentioning

confidence: 99%

Section: Parameters Of Filling Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of Roof Ground Subsidence While Applying a Continuous Excavation Continuous Backfill Method in Longwall Mining

Zhang

2019

Energies

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“…These two mixed grouts (the water content of grout B can exceed 95%) are solidified after half an hour and reach final strength after 60 days. Meanwhile, many field tests proved that surface subsidence can be effectively controlled [36]. Based on the geological conditions and analysis above, the critical problem for successful implementation is finding the optimal design for the layout and support of the roadway, the roadway backfill mining system, and the filling rate.…”

Section: Design Of the Technical Parametersmentioning

confidence: 99%

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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“…However, these materials have many shortcomings such as a complicated filling process, high investment cost, and poor effect of filling goaf. Until the 1980s, high-water materials (HWMs) were widely used in mine filling, which resolved the problems associated with traditional filling materials [6][7][8]. For example, Chen's research [9] showed that backfill satisfies the strength requirements and effectively controls the surface subsidence.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dry‐Wet Cycling on the Mechanical Properties of High‐Water Materials

Zhou

Liu

et al. 2020

Advances in Civil Engineering

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As a new grouting reinforcement material, high-water materials (HWMs) are being increasingly applied in different fields. This means that the environment in which these HWMs are employed are varied and increasingly complex. The dehydrating and saturation cycle of HWM caused by changes in the environment is referred to as the dry-wet cycle. To explore the influence of the dry-wet cycle on the mechanical properties of HWMs, uniaxial compression tests were performed on specimens with different water-to-cement ratios under different dry-wet cycles. The degradation rate of the peak stress and elastic modulus increased with an increase in the water-to-cement ratio. The failure mode of specimens changed from splitting failure to shear-splitting failure during the dry-wet cycle. The results of scanning electron microscope and X-ray diffraction showed that an HWM with a low water-to-cement ratio is relatively dense; therefore, the carbonization process is slow during dehydration. Raw materials were present after hydration and hardening reaction. Thus, the strength recovery ability is strong in materials with a low water-to-cement ratio during the saturation process. Finally, the experimental results can provide guidance for selecting materials with different water-to-cement ratios and control measures for dry-wet cycle can be determined according to different engineering environments.

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Soil and water conservation in mining area based on ground surface subsidence control: development of a high-water swelling material and its application in backfilling mining

Cited by 28 publications

References 34 publications

Characteristics of Roof Ground Subsidence While Applying a Continuous Excavation Continuous Backfill Method in Longwall Mining

Characteristics of Roof Ground Subsidence While Applying a Continuous Excavation Continuous Backfill Method in Longwall Mining

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

Effect of Dry‐Wet Cycling on the Mechanical Properties of High‐Water Materials

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