Transport mechanism and control technology of heavy metal ions in gangue backfill materials in short-wall block backfill mining

Zhang, Yun; Liu, Yongzi; Lai, Xingping; Cao, Shenggen; Yang, Yanbin; Yan, Baoxu; Bai, Licheng; Tong, Liang; Wang, He

doi:10.1016/j.scitotenv.2023.165139

Cited by 21 publications

(3 citation statements)

References 14 publications

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“…With the advancement of working face, overburden strata will collapse synchronously with the surface. Cao et al 21,22 obtained that when the overlying coal seam is directly hard rock, the abutment pressure concentration coefficient and the energy released by the system are the largest. The fracture of hard rock will pose a great threat to the safety production of the working face, which is easy to cause support failure accident or rock burst.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and control of strong rock pressure in the gully area under compound key strata

Lai,

Zhu,

Shan

et al. 2024

Energy Science & Engineering

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In view of the problem strong rock pressure is easy to occur in coal seam mining in western gully terrain. Based on the coal seam mining conditions in the gully area under the compound key strata of Zhujiamao Coal Mine, the methods of similar simulation, theoretical calculation and analysis, numerical simulation and field measurement are adopted. The dynamic structure model of the key strata of the gully is constructed, and the mechanism and prevention and control measures of the strong rock pressure in the gully area of the working face under the compound key strata are analyzed. The research shows that the upper slope section of the gully area first undergoes rotary deformation, and then the chain structure formed by the broken block occurs sliding instability and impacts inferior key strata, resulting in strong rock pressure behavior in the working face. The calculation formula of the first breaking step distance of the main key strata rotation deformation and sliding instability during the movement of the overlying strata is derived. The calculation results show that the initial rotation deformation and sliding instability breaking step distances are 27 and 142 m, respectively, which are in good agreement with the support crushing at 145 m of the first gully. Using 3DEC numerical simulation, the stress of the second gully is reduced by 3.8 MPa after pressure relief, which verifies the position of strong rock pressure calculated by the formula and provides a theoretical basis for subsequent hydraulic fracturing. According to the mechanism, the comprehensive prevention and control measures of strong rock pressure in gully terrain are put forward. The support resistance of the working face is calculated to be 10,011 kN by the support resistance formula, and the ZY11000/14/34D hydraulic support is used. The working resistance of the calculated dangerous area after hydraulic fracturing is basically lower than 30 MPa, and the control effect is good. It has reference significance for coal seam mining through gully terrain.

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Section: Introductionmentioning

confidence: 99%

Mechanism and control of strong rock pressure in the gully area under compound key strata

Lai,

Zhu,

Shan

et al. 2024

Energy Science & Engineering

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“…The occurrence of coal resources is often adjacent to the underground aquifer, and coal mining has a significant impact on alterations in groundwater resources. For many years, due to the lack of scientific guidance, the coal mining sector in China has not taken effective measures to protect groundwater resources during coal mining, which has led to great damage to underground aquifers in many coal mining areas in China [1][2][3][4]. The continuous exploitation of coal mine resources has led to an increasingly severe loss of underground water [5][6][7] and resulted in the occurrence of various coal mine disasters in recent years as well [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study on Permeability Evolution Law of Rock Mass under Mining Stress

Zhang,

Ji,

et al. 2024

Water

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In order to study the stress–strain–permeability coefficient relationship of overlying strata in a fractured zone after coal mining, taking the Changcun coal mine in the Changzhi basin as an example, the permeability evolution law of coarse sandstone, fine sandstone, siltstone and mudstone during a stress–strain process was analyzed through a triaxial compression permeability test. The generalized model of the rock mass permeability evolution process under mining stress was summarized, and then a coupling model of the stress–water pressure–permeability coefficient of fractured rock was established based on the continuum model of rock mass. The results showed that the maximum permeability coefficient of different coal overburden types was quite different, and the peak strength of the rock mass preceded the maximum permeability coefficient during the rock mass failure process; the permeability coefficient first decreased and then increased, reaching its maximum value after the peak stress, which occurred during the strain-softening stage; the generalized model of rock mass permeability included the compaction stage, elasticity stage, stable fracture stage, unstable fracture stage, macroscopic failure stage and residual strength stage.

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“…The expansion and penetration of the roadway-side filling body cracks is the key factor for the instability of its body under the balanced pressure of the overlying strata of mining face [12][13][14], proactively identifying and analyzing the dynamic crack expansion law of the road-side back-filling body in advance is essential for assessing the overall stability of filling body [15,16]. In terms of intelligent identification of dynamic expansion of rock mass cracks, deep learning methods are increasingly used in laboratory and field real-time monitoring.…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Crack Expansion and Size Effect of Back–Filling Concrete under Uniaxial Compression

Gao,

Xia,

Fan

et al. 2023

Materials

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With the continuous expansion of the application range of gob–side entry retaining technology, the depth, height, and advancing speed of coal seams also increase, which brings great problems to the stability control of surrounding rock structures of gob–side entry retaining. As one of the main bearing structures of the surrounding rock, the stability of the roadway–side support body is a key factor for the success of gob–side entry retaining. In order to study the deformation characteristics and instability mechanism of roadway-side support body, based on the roadway–side support materials of gob-side entry retaining, the dynamic expansion test of back–filling concrete cracks under uniaxial compression was carried out. The YOLOv5 algorithm was applied to establish the fine identification and quantitative characterization method of macroscopic cracks of the samples, and the dynamic expansion rule of roadway-side support body cracks and its dimensional effect were revealed by combining the fractal theory. The results show that the F1 value and average precision mean of the intelligent dynamic crack identification model reached 75% and 71%, respectively, the GIoU loss value tends to fit around 0.038, and the model reached the overall optimal solution. During the uniaxial compression process, micro cracks on the surface of the back–filling concrete first initiated at the end, and after reaching the yield stress, the macroscopic cracks developed significantly. Moreover, several secondary cracks expanded, pooled, and connected from the middle of the specimen to the two ends, inducing the overall instability of the specimen. The surface crack expansion rate, density, and fractal dimension all show stage change characteristics with the increase in stress, and the main crack expansion rate has obvious precursor characteristics. With the increase in the size, the decrease in crack density after back–filling concrete failures gradually decreases from 93.19% to 4.08%, the surface crack network develops from complex to simple, and the failure mode transits from tensile failure to shear failure. The above research results provide a basic experimental basis for design optimization and instability prediction of a roadway–side support body for engineering-scale applications.

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Transport mechanism and control technology of heavy metal ions in gangue backfill materials in short-wall block backfill mining

Cited by 21 publications

References 14 publications

Mechanism and control of strong rock pressure in the gully area under compound key strata

Mechanism and control of strong rock pressure in the gully area under compound key strata

Study on Permeability Evolution Law of Rock Mass under Mining Stress

Study on Dynamic Crack Expansion and Size Effect of Back–Filling Concrete under Uniaxial Compression

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