Experimental investigation on mining-induced strain and failure characteristics of rock masses of mine floor

Zeng, Wei; Huang, Zhen; Wu, Yun; Li, Shijie; Zhang, Rui; Zhao, Kui

doi:10.1080/19475705.2020.1734102

Cited by 34 publications

(13 citation statements)

References 42 publications

(47 reference statements)

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“…In addition, compared with the PCA method, PLS-DA has the function of quantifying the degree of difference between different water sources caused by the characteristic water chemical composition. The loading scatter plots of PCA and PLS-DA both showed that TDS, HCO t [3] t [1] t [2] t [3] Figure 8: Schematic diagram of the PLS-DA model in threedimensional space. 100: fourth aquifer water; 010: coal-bearing sandstone aquifer water; 001: limestone aquifer water.…”

Section: Discussionmentioning

confidence: 99%

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Application of Partial Least Squares-Discriminate Analysis Model Based on Water Chemical Compositions in Identifying Water Inrush Sources from Multiple Aquifers in Mines

Zhai

et al. 2021

Geofluids

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Mine water inrush seriously threatens the safety of coal mine production. Quick and accurate identification of mine water inrush sources is of great significance to preventing mine water hazards. This paper combined partial least squares-discriminate analysis (PLS-DA) with inrush water chemical composition to identify the source of water inrush from multiple aquifers in mines. The Renlou Coal Mine in the Linhuan mining area was selected for this study, and seven conventional water chemical compositions from 54 water samples in three aquifers were collected and tested, of which 45 water samples were used to establish the PLS-DA discriminant model, and nine were used to test the prediction effect. To improve model accuracy and predictive ability, hierarchical clustering analysis method was used to eliminate seven unqualified water samples to reduce the errors caused by improper data. PCA and PLS-DA methods were used to analyze and process the remaining water sample data, and on the basis of PCA analysis, the remaining 38 water samples were used to establish the PLS-DA discriminant model. The model was validated using permutation and external prediction tests. The research shows the following results: (1) Both PCA and PLS-DA methods can distinguish water samples from three different water sources, but the classification effect of PLS-DA was better than PCA because it can strengthen the difference of water chemical composition between different water sources. (2) The correct discrimination rate of the PLS-DA discriminant model was as high as 100%, and permutation tests showed that the model was not overfit. External validation found that the model had good stability and discrimination. (3) HCO3- and total dissolved solids (TDS) were the most important differential marker compositions that affected the discrimination results based on Variable Importance for the Projection (VIP) scores. The discriminant model established in this study combined the advantages of principal component analysis and multiple regression analysis, providing a new method for accurately identifying the sources of water inrush in mines.

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Section: Discussionmentioning

confidence: 99%

“…Coal resource is an important basic resource for the longterm rapid and stable development of the national economy in China [1]. As mining depth has increased, water inrush disaster occurrence has also increased, which poses a serious threat to the safety of coal mine production [2,3].…”

Section: Introductionmentioning

confidence: 99%

Application of Partial Least Squares-Discriminate Analysis Model Based on Water Chemical Compositions in Identifying Water Inrush Sources from Multiple Aquifers in Mines

Zhai

et al. 2021

Geofluids

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“…The mined-out areas formed during the mining of metal mines lead to the movement and fragmentation of rock layers, which in turn causes surface settlement in the mining area, unbalanced ecological environment, and even a series of problems such as safety accidents (Yang et al, 2017;Xu et al, 2019a;Huang et al, 2019;Zeng et al, 2020;Zheng et al, 2021). Meanwhile, a large number of tailings will inevitably be produced in the process of mineral processing.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Alkalized Rice Straw Content on Strength Properties and Microstructure of Cemented Tailings Backfill

et al. 2021

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The tailings and rice straw are waste by-products, and the storage of tailings on the ground and the burning of rice straws will seriously damage the ecological environment. In this study, the effect of different contents of alkalized rice straw (ARS; rice straw was alkalized with 4% NaOH solution) on the mechanical properties and microstructure of cemented tailings backfill (CTB; ARSCTB) was studied through uniaxial compressive strength (UCS), scanning electron microscopy (SEM), and X-ray diffraction (XRD) tests. The results indicated that 1) the UCS of ARSCTB could be improved by ARS. However, with the increase in the ARS content from 0.1 to 0.4 wt%, the UCS showed a monotonous decreasing trend. The UCS improvement effect was best when the ARS content was 0.1 wt%, and at 7, 14, and 28 days curing ages, the UCS increased rate was 6.0, 8.3, 14.7% respectively. 2) The tensile strength of ARSCTB was generally higher than that of CTB and positively correlated with the ARS content. The tensile strength increase rate was 24.1–34.2% at 28 days curing age. 3) The SEM test indicated that the ARS was wrapped by cement hydration products, which improves its connection with the ARSCTB matrix. ARS performed a bridging role, inhibited cracks propagation, and provided drag or pulling force for the block that is about to fall off. Therefore, the mechanical properties of ARSCTB were enhanced. However, under high ARS content, the inhibition of ARS on hydration reaction and the overlap between ARS were not conducive to the improvement of the UCS of ARSCTB. 4) The post-peak residual strength and integrity effect of ARSCTB were greater. It is recommended to add 0.1–0.2 wt% ARS to the backfill with high compressive strength requirements such as the empty field subsequent filling mining method and the artificial pillar. 0.3–0.4 wt% ARS is incorporated into backfill with high tensile strength requirements such as high-stage filling with lateral exposure and artificial roof. This study further makes up for the blank of the application of plant fiber in the field of mine filling and helps to improve the mechanical properties of backfill through low-cost materials.

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“…This behavior changes the stability of regional geological structure and then affects the mining efficiency and safety of underlying coal seam. At present, many scholars have studied the changes of mineral composition and chemical characteristics of overlying rock and soil after being baked by coal fire (Khoury 2020b;Zhang et al 2020;Savina et al 2020;Sokol et al 2020;Chen et al 2020); however, the physical and mechanical properties and pore structure characteristics of pyrometamorphic rocks caused by coal fire have not been widely concerned (Zeng et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Effects of water content and salinity on the porosity structure and resistivity of loess soil sintered at 1000 °C

et al. 2021

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The spontaneous combustion of coal in oxygen environment changes the physical and mechanical properties and pore structure of rock and soil. In north of Shaanxi, the Quaternary loess is widely deposited on coal seam. In order to explore the influence of different factors on the change of loess properties after coal fire baking, loess samples with different initial water contents and salt contents were selected for high-temperature sintering. The effects of water content and salinity on the porosity and resistivity of loess after high-temperature baking were analyzed by basic physical property test, resistivity test and nuclear magnetic resonance test. The results show that, under the influence of coal fire, the porosity and main pore size increased with water content or salinity. With the increase of porosity, the resistivity first decreases and then increases. This paper systematically studies the influence of high temperature on the physical properties of loess under different conditions, which provides a reference for studying the effect of coal fire on loess in north of Shaanxi.

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Experimental investigation on mining-induced strain and failure characteristics of rock masses of mine floor

Abstract: (2020) Experimental investigation on mining-induced strain and failure characteristics of rock masses of mine floor,

Cited by 34 publications

References 42 publications

Application of Partial Least Squares-Discriminate Analysis Model Based on Water Chemical Compositions in Identifying Water Inrush Sources from Multiple Aquifers in Mines

Application of Partial Least Squares-Discriminate Analysis Model Based on Water Chemical Compositions in Identifying Water Inrush Sources from Multiple Aquifers in Mines

Effect of the Alkalized Rice Straw Content on Strength Properties and Microstructure of Cemented Tailings Backfill

Effects of water content and salinity on the porosity structure and resistivity of loess soil sintered at 1000 °C

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