Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios

Rastegarmanesh, Ashkan; Mirzaghorbanali, Ali; McDougall, Kevin; Aziz, Naj; Anzanpour, Sina; Nourizadeh, Hadi; Moosavi, M.

doi:10.1007/s00603-022-02950-4

Cited by 11 publications

(2 citation statements)

References 8 publications

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“…The mining width depends on the occurrence conditions of the coal mine; a small mining width corresponds to less impact on the subsidence [44]. Support strength is represented by the support resistance; when the support resistance is larger, the support force on the surface is greater, and therefore the impact is smaller [45]. Coal mines are mostly shallow-buried coal seam groups with two to four layers.…”

Section: Southwest Mine Surface Subsidence Grade Evaluation Systemmentioning

confidence: 99%

Comprehensive Identification of Surface Subsidence Evaluation Grades of Mines in Southwest China

Kong

Kong²,

Liu³

et al. 2022

Mathematics

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Due to their complex geological structure, it is difficult to systematically analyze the surface subsidence of coal mines in southwest China, and the factors that cause surface subsidence are also different from other coal mines. Focusing on the problem of surface subsidence caused by mining in southwest China’s mines, a grade evaluation system for surface subsidence of southwest mines is constructed based on the analytic hierarchy process, and ten evaluation indicators are established from the perspectives of mining disturbance and geological structure. A matter–element model of surface subsidence based on matter–element extension theory and a cloud model of surface subsidence based on cloud theory are then constructed. A coal mine in Anshun, Guizhou, is taken as an example to calculate the evaluation level of surface subsidence and thus verify the scientificity of extension theory and cloud theory. The results show that the main factors that affect the surface subsidence of southwest mines are the number of coal seam layers, mining height and comprehensive Platt hardness of rock, similar to that of northern plain coal mines. Surface slope and subsidence area are also very important. The comprehensive correlation degree of each grade of the coal mine is −0.29836, 0.192232, −0.1093 and −0.46531, and the coal mine is concluded to be in grade 2. The calculated similarity of the overall index evaluation cloud map of the coal mine and each grade is 0, 0.3453, 0.7872 and 0, respectively. The coal mine is in grade 2, which is a relatively safe state. Consistent with the calculation results of the extension model and in line with the field situation, the extension matter–element model and cloud model built in this paper can verify each other and have a certain scientificity.

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Section: Southwest Mine Surface Subsidence Grade Evaluation Systemmentioning

confidence: 99%

Comprehensive Identification of Surface Subsidence Evaluation Grades of Mines in Southwest China

Kong

Kong²,

Liu³

et al. 2022

Mathematics

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“…In the rockbolting system, there are mainly three components: rockbolts, grout and rock masses. Among them, the grout is the medium that connects rockbolts and rock masses [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Grout Properties on the Tensile Performance of Rockbolts Based on Modified Cable Elements

Chen,

Wang,

Zhao

et al. 2023

Materials

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The grout annulus (GA) has a significant effect on the tensile performance of rockbolts in mining engineering. However, little research has been conducted to use modified cable elements to study this effect quantitatively. This paper used the modified cable elements in FLAC3D to study the effect of the GA on the tensile performance of rockbolts. The two-stage coupling law was used to simulate the behaviour of the GA. The stress had a linear relation with the slippage before the shear strength (SS). After the SS, the stress decreased exponentially. Numerical in situ roadway reinforcement cases were used to study the influence of the grout annulus on the tensile performance of rockbolts. The results showed that, when the SS of the GA increased from 3.2 MPa to 6.4 Mpa, the peak force of rockbolts increased from 247 kN to 425 kN. Moreover, when the SS of the GA increased from 3.2 Mpa to 6.4 Mpa, the distance between the position of the maximum tensile capacity and the external end decreased from 1.17 m to 0.81 m. Last, for the circular roadway, the peak force in rockbolts installed in the lateral side was 171.7 kN, which was significantly larger than the top side of 72.3 kN.

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Influence of Bolts and Cables on Stability of Surrounding Rock of Bottom Drainage Roadway

Li,

Sun

2023

Geotech Geol Eng

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Axial Performance of Cementitious Grouted Cable Bolts Under Rotation Constraint Scenarios

Cited by 11 publications

References 8 publications

Comprehensive Identification of Surface Subsidence Evaluation Grades of Mines in Southwest China

Comprehensive Identification of Surface Subsidence Evaluation Grades of Mines in Southwest China

Influence of Grout Properties on the Tensile Performance of Rockbolts Based on Modified Cable Elements

Influence of Bolts and Cables on Stability of Surrounding Rock of Bottom Drainage Roadway

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