Acoustic emission characteristics and damage evolution process of backfilling body–coal pillar–backfilling body composite structure

Cui, Boqiang; Feng, Guorui; Bai, Jinwen; Wang, Kai; Shi, Xudong; Wu, H. R.

doi:10.1007/s10064-022-02779-9

Cited by 18 publications

(10 citation statements)

References 50 publications

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“…According to the periodic weighting step of the adjacent working face, here, l is 10 m, the overlying strata load, the average bulk density of the overlying strata γ is 25 kN/m 3 . Combined with the site, the thickness of the main roof is 5.0 m, and the Poisson's ratio u is 0.25, which are brought into equations ( 3)- (11), respectively, and a 1T , a 2S , a 3T are : 10, 10, 13.5, from equation ( 12), a is 10 m. The limit width of mining strip is 10 m.…”

Section: Strip Interval Filling Mining Technology Principlementioning

confidence: 99%

Study on overlying strata migration law of strip interval filling mining

et al. 2023

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Aiming at the problem that it is difficult to popularize in Guizhou mining area due to high filling cost, taking 11071 working face of Panzhihua Coal Mine in Liupanshui as the research background, the idea and technology of strip interval filling mining are put forward. Through theoretical analysis and mechanical tests, the reasonable range of strip spacing distance and mechanical parameters of filling body were obtained. The FLAC3D simulation software is used to analyze the stress field, displacement field, and plastic zone of five kinds of design schemes, and the UDEC simulation software is used to carry out the filling mining of No.7 coal seam. The results show that the strip interval filling mining technology regards the empty roof area as a controllable underground spatial structure, and the single spatial stress field changes little. The load on the immediate roof is gradually transferred from the top of the empty roof area to the top of the filling body. The “filling body-direct roof” structure improves the self-bearing capacity of the immediate roof, and the overlying surrounding rock migration is controlled. With the increase of mining depth, it gradually tends to the original rock stress, and the control effect on surface subsidence is more significant. Finally, “filling 3 m interval 3 m” is determined as the optimal filling scheme. In the process of simulated filling mining, the peak stress in the stress concentration area of the front coal wall shows a trend of “increase-decrease-increase,” and the peak stress curve of the immediate roof in the middle of the stope changes from “increase-decrease ‘trend to’ increase-decrease-increase-decrease” trend. The rock layer near the immediate roof is in a stress concentration state in the coal wall area on both sides, and the middle part is not obvious.

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Section: Strip Interval Filling Mining Technology Principlementioning

confidence: 99%

Study on overlying strata migration law of strip interval filling mining

et al. 2023

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“…It is widely believed that paste backfilling is an ideal solution for addressing environmental issues associated with coal mining. − The stability of the goaf is closely related to the structural properties of the paste backfill after its implementation. Factors such as temperature, pressure, and chemical composition affect the paste backfill, leading to physicochemical changes and subsequently influencing the filling effect. − …”

Section: Introductionmentioning

confidence: 99%

Evolution of a Filling Paste Cementitious System and Impact Patterns of Sulfate Mine Water Erosion on Filling Paste Performance

Lu,

Wang,

Zhou

et al. 2024

ACS Omega

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To assess the impact of sulfate mine water on filling material performance, an accelerated sulfate erosion process was used to analyze the effects of various erosion concentrations, aging periods, and cation types on the macroscopic properties of the filling paste. These properties encompassed apparent phenomena, mass changes, and alterations in the uniaxial compressive strength. Observations revealed sulfate erosion, causing the formation of white substances and salt crystals on specimen surfaces. Initially, all solution-eroded specimens exhibited increased mass and strength. Over time, specimens in 5 and 10% MgSO 4 solutions displayed the first signs of decline, while variations in other solutions were relatively small. Increasing the erosion concentration led to greater variations in mass and strength during the initial erosion phase. Specimens in 5 and 10% MgSO 4 solutions initially peaked in mass and compressive strength, followed by a decline, while other filling paste specimens continued slow increases. Under equivalent conditions, the MgSO 4 solution exhibited stronger erosion than the Na 2 SO 4 solution. Composite erosion by Na 2 SO 4 and MgSO 4 involved initial strengthening and gel pore filling, intermediate expansion and crystallization, and late-stage substantial degradation, with MgSO 4 exhibiting a more pronounced and complex impact. Gray relational analysis ranked factors affecting mass and uniaxial compressive strength variations as erosion concentration > erosion ion type > erosion aging period. Correlation degrees for factors influencing mass variations were 0.8822, 0.8714, and 0.4754, while for factors influencing uniaxial compressive strength variations, the correlation degrees were 0.8336, 0.7943, and 0.6125, respectively.

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“…Shan et al investigated the effect of water content on the damage characteristics of loaded coal rock with the help of acoustic emission technology . Cui et al elucidated the relationship between strain and damage variables during uniaxial compression by analyzing the acoustic emission ringing number . Through the improved G–P algorithm, Gu calculated the fractal characteristics of acoustic emission parameters and concluded that the sudden decrease of fractal dimension could be used as a criterion for the damage precursor of coal samples .…”

Section: Introductionmentioning

confidence: 99%

“… 12 Cui et al elucidated the relationship between strain and damage variables during uniaxial compression by analyzing the acoustic emission ringing number. 13 Through the improved G–P algorithm, Gu calculated the fractal characteristics of acoustic emission parameters and concluded that the sudden decrease of fractal dimension could be used as a criterion for the damage precursor of coal samples. 14 With the development of computers, numerical simulation technology has shown unique advantages in the study of the evolutionary characteristics of coal rock microfracture emergence and expansion.…”

Section: Introductionmentioning

confidence: 99%

Damage Evolution Characteristics and Constitutive Model for Coal and Rock under Asymmetric Loading

Wang,

Zhao,

Zhang

et al. 2024

ACS Omega

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Tunnels and shaft mining roadways are often subjected to varying degrees of asymmetric loading due to terrain relief or project excavation. In order to analyze the influence of the asymmetric degree of loading on the mechanical properties and damage rupture law of coal rock, uniaxial compression tests of coal rock under four asymmetric loading modes were carried out, the influence of the asymmetric coefficients of loading on macro- and micromechanical properties of coal and rock was analyzed, and a statistical damage constitutive model of coal and rock was established to reflect the asymmetric loading degree. The results of the study show that the peak stress of the coal rock decreases gradually with the increase in the asymmetric coefficient of loading, and the two are linear functions of each other. The distribution of the acoustic emission ringing count peak value is concentrated under uniform loading, while the acoustic emission ringing count rate presents a multipeak phenomenon under asymmetric loading, and the peak value points are scattered. In the case of asymmetric loading, the stress concentration on the edge of the upper loading plate leads to shear failure, and the microscopic cracks are concentrated near the interface between the loading zone and the nonloading zone. According to the established damage constitutive model, when the damage degree is the same, the larger the asymmetric coefficient, the smaller the strain value, which indicates that the asymmetric loading promotes the damage of coal and rock.

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Acoustic emission characteristics and damage evolution process of backfilling body–coal pillar–backfilling body composite structure

Cited by 18 publications

References 50 publications

Study on overlying strata migration law of strip interval filling mining

Study on overlying strata migration law of strip interval filling mining

Evolution of a Filling Paste Cementitious System and Impact Patterns of Sulfate Mine Water Erosion on Filling Paste Performance

Damage Evolution Characteristics and Constitutive Model for Coal and Rock under Asymmetric Loading

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