Reutilization of gangue wastes in underground backfilling mining: Overburden aquifer protection

Ma, Dexin; Zhang, Jixiong; Duan, Hongyu; Huang, Yanli; Meng, Lingkui; Sun, Qiang; Zhou, Nan

doi:10.1016/j.chemosphere.2020.128400

Cited by 162 publications

(83 citation statements)

References 46 publications

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“…Coal is one of the important basic energies for China and global economic construction, accounting for more than 30% of the total global energy consumption [1]. In 2017, the total global coal production reached 5.481 billion tons, with a year-on-year increase of 3.4% and a sustained growth trend [2,3]. In the same year, China's coal production reached 2.541 billion tons, accounting for 46.4% of the total global coal production, ranking first in the world [4,5].…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster-Causing Mechanism of Rockburst in the Hanging Wall Mining

Pengfei

Jiabin

Wang

et al. 2021

Advances in Civil Engineering

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Coal mine rockburst is closely related to the complex geological structure. Understanding the criterion of the fault activation instability and the disaster-causing mechanism of rockburst under the influence of mining is the theoretical premise and important guarantee of safe and efficient coal mining. In this paper, based on the theory of key stratum, the mechanical model of fault slip instability in the normal fault during the hanging wall mining was established, and the instability criterion was derived. It is concluded that the fault slip instability of the hanging wall is mainly controlled by two factors: (1) the distance between coal seams and key stratum and (2) the distance between working face and fault. Moreover, these two factors have an inverse relation to the occurrence of rockburst. Subsequently, three conceptual models of rockburst induced by the fault stress transfer, stress concentration of coal pillars, and fault structural instability were proposed. Based on the rock mechanics theory, the rockburst carrier system model of “roof-coal seam-floor” near the fault was established. The mechanical essence of fault rockburst was obtained as follows: under the action of fault, the static load of fault coal pillar was increased and superimposed with the fault activation dynamic load, leading to high-strength rockburst disaster. Based on the occurrence mechanism of fault rockburst, the monitoring and prevention concept and technical measures were proposed in three aspects, including the monitoring and control of fault activation dynamic loads, the monitoring of high static load in fault coal pillar and stress release, and the strengthening roadway support. These prevention and control measures were verified in the panel 103down02 of the Baodian Coal Mine in engineering, and the effectiveness of these measures was proved.

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Section: Introductionmentioning

confidence: 99%

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster-Causing Mechanism of Rockburst in the Hanging Wall Mining

Pengfei

Jiabin

Wang

et al. 2021

Advances in Civil Engineering

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show abstract

“…As known to all, the macromechanical properties of rock materials are very important for the design and construction of rock engineering, such as macroelastic modulus and macrofracture toughness [1][2][3][4]. The former is commonly obtained from unconfined compressive tests [5][6][7] and the latter from specific fracture tests, such as the short rod test [8] and notched semicircular bending (NSCB) test [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Estimating Macrofracture Toughness of Sandstone Based on Nanoindentation

et al. 2021

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An upscaling method for estimating macrofracture toughness by nanoindentation results was proposed in this study. Grid nanoindentation tests were conducted on sandstone samples to obtain micromechanical properties of indents, including elastic modulus, hardness, and stiffness. Multifactor cluster analysis was then carried out to categorize the sandstone into five mechanical phases. Finally, the macrofracture toughness was predicted by using the macroelastic modulus of the sample and the critical energy release rate of the weakest phase. To verify this method, the upscaling result was compared with the macrofracture toughness measured by the notched semicircular bending (NSCB) test. The discrepancy in the macrofracture toughness from our method and the NSCB test was 8.8%, which was acceptable. Also, it is proved that our method can provide more accurate upscaling results compared to other methods.

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“…e tensile and fracture properties of rock are of great significance for rock mass stability control [1], rock hydraulic/gas fracturing [2], and roadway roof support design [3,4]. Many scholars have carried out extensive research on the mechanism of tunnel deformation instability and rock burst.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Tensile and Fracture Properties of Burst-Prone Coal under Quasistatic Condition

Gong

Wang

Zhou

et al. 2021

Shock and Vibration

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To study the tensile and fracture properties of the specimen under the quasistatic loading, the Brazilian disc splitting method and the notched semicircular bend (NSCB) method were used to test the tensile properties of coal specimens, and the fracture properties of NSCB specimens with different notch depths were tested and analyzed. The applicability of plane strain fracture toughness KIC and J-integral fracture toughness in evaluating the fracture properties of coal specimens was discussed. The influence of notch depth on the fracture toughness measurement of the NSCB specimen was studied. Combined with the surface strain monitoring of specimens during loading and the industrial CT scanning image of damaged specimens, the deformation characteristics of coal specimen under loads and the distribution law of crack after failure were analyzed. The results show that the NSCB test is suitable for measuring the tensile strength of a coal specimen; when the dimensionless notch depth is β = 0.28, the dispersion of plane strain fracture toughness KIC of the NSCB specimen is the smallest. Besides, the plane strain fracture toughness of coal is obviously affected by the notch depth and dimensionless stress intensity factor. The J-integral fracture toughness can be used to effectively evaluate the fracture performance of specimens.

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Reutilization of gangue wastes in underground backfilling mining: Overburden aquifer protection

Cited by 162 publications

References 46 publications

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster-Causing Mechanism of Rockburst in the Hanging Wall Mining

The Mechanical Criterion of Activation and Instability of Normal Fault Induced by the Movement of Key Stratum and Its Disaster-Causing Mechanism of Rockburst in the Hanging Wall Mining

Estimating Macrofracture Toughness of Sandstone Based on Nanoindentation

Experimental Investigation on the Tensile and Fracture Properties of Burst-Prone Coal under Quasistatic Condition

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