Predicting the Water-Conducting Fracture Zone (WCFZ) Height Using an MPGA-SVR Approach

Guo, Chuangxin; Yang, Zhen; Shen, Li; Lou, Jinfu

doi:10.3390/su12051809

Cited by 16 publications

(10 citation statements)

References 28 publications

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“…In the meantime, populations evolved synchronously, covering both global and local searches of the algorithm. The problem of inconsistent experimental results is solved by MPGA in the literature ( Guo et al, 2020 ; Shi et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

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Inversion method of particle size distribution of milk fat based on improved MPGA

Ding

Zhou

et al. 2022

Front. Bioeng. Biotechnol.

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Milk fat’s particle size and distribution not only affect product quality, but also have great impacts on food safety in the economy and society. Based on total light scattering method, this paper has studied the inversion method of particle size distribution under dependent mode condition by combining multi-population genetic algorithm (MPGA) with Tikhonov smooth function. It has minimized the influence from light-absorb medium to improve the inversion accuracy. The approach introduces Tikhonov smooth function and apparent optical parameters to build an objective fitness function and weaken the ill condition of the particle size inversion equation. It also introduces multi-population genetic algorithm to solve the premature convergence of genetic algorithms. The results show that the relative error of the milk fat simulation solution with a nominal diameter is -3.52%, which meets the national standard of ±8% and better than the relative error of -5.01% of the standard genetic algorithm. Thus, the improved MPGA can reconstruct particle size distribution, with a good reliability and stability.

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Section: Discussionmentioning

confidence: 99%

“…After the objective function was constructed by Tikhonov ( Yang, 2016 ; Wang et al, 2019 ; Zhou et al, 20212021 ) regularization, MPGA ( Guo et al, 2020 ; Shi et al, 2021 ; Yang et al, 2022 ) was introduced to find the minimum value.…”

Section: Methodsmentioning

confidence: 99%

Inversion method of particle size distribution of milk fat based on improved MPGA

Ding

Zhou

et al. 2022

Front. Bioeng. Biotechnol.

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“…According to the theory of mine pressure control [ 53 – 55 ], the maximum heights of the caving zone and the fractured zone are calculated by Eq ( 1 ) and Eq ( 2 ) when the overburden is hard [ 56 , 57 ]. where H c is the height of the caving zone, m; M is the mining height of the coal seam, 5 m, and H f is the height of the fractured zone, m.…”

Section: Similarity Model Experimentsmentioning

confidence: 99%

“…According to the theory of mine pressure control [53][54][55], the maximum heights of the caving zone and the fractured zone are calculated by Eq (1) and Eq (2) when the overburden is hard [56,57].…”

Section: Similarity Model Experimentsmentioning

confidence: 99%

The pressure relief protection effect of different strip widths, dip angles and pillar widths of an underside protective seam

et al. 2021

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To design underside protective seam strip layout. Similarity model experiments, numerical simulations and theoretical calculations are used to quantitatively study the pressure relief protection effect of different strip widths, dip angles and coal pillar widths of a thin underside protective seam under deeply buried conditions. The optimal strip width range is obtained according to the change law of strain during the mining process of the underside protective seam in a similar model experiment. The change law of the expansion of the protected coal seam is obtained and the fitting surfaces among the dip angle and strip width of the coal seam with the protection distance and pressure relief angle along the strike and dip of the protected coal seam are established according to the numerical simulation results of underside protective seam mining. It is concluded that the best pressure relief effect can be achieved when the dip angle is 16.7° and the strip width is 70 m. According to the stability threshold of coal pillars considered in strip mining theory, the coal pillar width is calculated to be 50 m. Similarity model experiments and numerical simulations of protected coal seam mining verify the pressure relief effect of the designed protective seam strip width and pillar width. A calculation method of the protective seam strip width, position and pillar width required by the specific width of the protected seam is proposed.

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“…Water-conducting fractured zone as an important embodiment of overlaying rock failure law, it can be generally determined by four methods, that is, empirical formula (Fan H, et al 2020), numerical simulation (Dar I A, et al 2010;Guo C, et al 2020;Nikić, Z, et al 2019;Ross S. 2018;Sener E, et al 2005), similar material experiment (Maria K, et al 2019), and field measurement (Almadani S, et al 2019). There are "natural slope theory", "circular arch theory" and "zonal theory" in abroad research (Chu FJ.…”

Section: Fig 1 Tanlu Fault Zonementioning

confidence: 99%

Mechanism of Water-Conducting Fractured Zone in Jiaojia Gold Mine With Deep Mining Based on Constitutive Model

Pang¹,

Wang²,

Shi³

et al. 2021

Preprint

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The deep resources of the gold mines have great potential to be the leading area of the national gold industry. However, with the increase of mining depth in Jiaojia gold mine of Shandong province, China, the overburden stress is increasing, the spatial and temporal distribution of mining stress field is more complex to cause spatial structure of overlying strata seriously damaged, which often leads to mine water disaster. Therefore, the research on the law of surrounding rock stress and water-conducting fractured zone development has become an important topic for safe mining of gold mines. In this paper, based on the analysis of borehole data and profile map, three-dimensional geological model was established to predict the height of the water-conducting fracture zone by using Sufer17, Rhino 6, Griddle plug-in and FLAC3D software, and the mining process with the method of downward horizontal slice stoping-filling was simulated by using constitutive model. Results show that the maximum height of the water-conducting fractured zone is about 21.2 m during the whole mining at -700 level, the shape is from near horizontal to micro arch, the failure range of the plastic area near the fault is larger than that far away from the fault. The stress distribution on both sides of the fault is not continuous, which is larger in the hanging wall than that in the footwall. The stress concentration zone is formed in the front and back of the stope during mining process and increases with mining depth. This method can restore the original state of underground stress field to the greatest extent, and make up for the lack of empirical formula theory and the limitation of similar material method for deep mining, which is relatively more accurate and reliable.

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Predicting the Water-Conducting Fracture Zone (WCFZ) Height Using an MPGA-SVR Approach

Cited by 16 publications

References 28 publications

Inversion method of particle size distribution of milk fat based on improved MPGA

Inversion method of particle size distribution of milk fat based on improved MPGA

The pressure relief protection effect of different strip widths, dip angles and pillar widths of an underside protective seam

Mechanism of Water-Conducting Fractured Zone in Jiaojia Gold Mine With Deep Mining Based on Constitutive Model

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