Decoupling Analysis of Interaction between Tunnel Surrounding Rock and Support in Xigeda Formation Strata

Zhou, Ping; Zhou, Feicong; Lin, Jeffrey S.; Li, Jinyi; Jiang, Yifan; Yang, Bao Guo; Wang, Zhijie

doi:10.1007/s12205-021-0618-4

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…As the effectiveness of cold forming of heat-treatable wrought aluminum alloys is limited by low formability and the high degree of springback, and conventional hot forming processes affect the microstructural phenomena as described above, ongoing research has focused on the development of a thermomechanical (hot) forming process approach that integrates the process route required to give PH. [88,[149][150][151][152][153][154] This process, first proposed by Lin et al [149] as HFQ, primarily consists of three steps, shown schematically in Figure 16. The first step consists of solution annealing (solution heat treatment), whereby the material is heated at a sufficiently high temperature to dissolve the alloying elements and form a single-phase solid solution.…”

Section: Hot Forming-quenching Of Aluminum Alloysmentioning

confidence: 99%

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

et al. 2023

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In the past decade, aluminum alloys have become important structural materials in the automotive industry, thanks to their low density, high strength, high fracture toughness, and good fatigue performance. However, an important limitation of aluminum alloys is their poor formability at room temperature; as a result, numerous studies have been conducted with the aim of developing forming techniques to overcome this and facilitate the forming of more complex‐shaped components. Following an overview on the metallurgical background of aluminum alloys, this article reviews recent developments in forming processes for aluminum alloys. The focus is on process variants at room temperature and at higher temperatures and on a new hot forming technique promising considerable improvements in formability. This review summarizes the influence of different process parameters on microstructures and mechanical properties. Particular emphasis is given to process design and to the underlying microstructural phenomena governing the strengthening mechanisms.

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Section: Hot Forming-quenching Of Aluminum Alloysmentioning

confidence: 99%

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

et al. 2023

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“…Through laboratory tests and numerical simulation methods, WANG et al [8] studied the instability characteristics of the surrounding rock of the tunnel in the Xigeda stratum under different water contents and proposed corresponding deformation control methods. Based on the constraint loss theory of the tunnel face space effect, ZHOU et al [9] decoupled the whole process of the interaction between the surrounding rock and support and discussed the influence of multiple dependent variables. ZHOU et al [10] analyzed the apparent failure characteristics and catastrophe mechanism of the surrounding rock of Xigeda formation tunnels with different interbed types, using field investigation, indoor test, numerical simulation, field monitoring, and theoretical research.…”

Section: Introductionmentioning

confidence: 99%

Determination of Supporting Time of Tunnels in the Xigeda Stratum Based on the Convergence-Confinement Method

Zhong,

Tang,

2023

Applied Sciences

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The mechanical properties of the surrounding rock of the Xigeda stratum are easily affected by water content. In order to obtain the support characteristics of Xigeda strata, the finite difference method was used to obtain the longitudinal deformation of the surrounding rock at a certain distance from the tunnel excavation face under different water contents. Then, the longitudinal deformation profiles of a Xigeda stratum tunnel were obtained under different water content conditions. The accuracy and applicability of the results were verified through error analysis and comparison with existing research results. Based on the convergence-confinement principle, it is proposed that the best time to apply support is when the displacement increment of the surrounding rock has a sharp increase point. The support construction time under different water content conditions was obtained with the distance from the tunnel excavation face as the control index. The results show that with the increase in water content, the longitudinal deformation profile’s growth trend is steeper near the excavation surface and it is gentler when the distance from the excavation face becomes large. At a water content of 20%, the support should be applied 2.67 m behind the excavation face; at a water content of 25%, the support should be applied 1.46 m behind the excavation face. The result has a certain guiding significance for the safety of tunnel construction in the Xigeda stratum.

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“…The results are of great significance to coal seam mine design, the prediction of the stiffness of weak parts, and optimization of the support structure. 1,2 Zhou et al 3 used the ZY12000/28/64 roof cover hydraulic supports as primary reference objects and constructed a kinetic equation by applying the Lagrange equations of the second kind. The kinetic equation was then used to analyze the quality, initial height, and fracture point of the main roof.…”

Section: Introductionmentioning

confidence: 99%

“…Zhou et al 3 used the ZY12000/28/64 roof cover hydraulic supports as primary reference objects and constructed a kinetic equation by applying the Lagrange equations of the second kind. The kinetic equation was then used to analyze the quality, initial height, and fracture point of the main roof.…”

Section: Introductionmentioning

confidence: 99%

Mechanical analysis of the structure of longwall mining hydraulic support

Wang

Zhang

et al. 2020

Science Progress

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Existing studies of the structural strength of longwall mining hydraulic support are mainly focused on the force acting on individual supports instead of the general mechanical characteristics of the support group in a fully mechanized coal seam working face. This study combines theoretical analyses and experiments to investigate the mechanical characteristics of a longwall mining hydraulic support group and the stiffness of key support components under different working conditions. The theory of a beam on an elastic foundation was applied to construct a mechanical model for the hydraulic support group. The location and the size of loads on the top beam were determined. Field tests yielded data on the deflection of the roof and loading on the support group along the working face, where the stiffness of end supports varies. The transverse load distribution of the top beam and the offset loading coefficient at different locations along the working-face direction were obtained. A three-dimensional model was constructed for the support group while assembling virtual hydraulic supports using modern virtual modeling theories and methods. Finite element analysis was used to analyze the strength of the hydraulic support. The weakest areas of key components were found to be pinholes connecting the column cylinder to the base and roof of the mine. These results can be applied to achieve secure and stable operations of hydraulic supports in the working face of a thin coal seam, thereby improving the safety and production efficiency of mining operations.

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Decoupling Analysis of Interaction between Tunnel Surrounding Rock and Support in Xigeda Formation Strata

Cited by 9 publications

References 23 publications

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

Determination of Supporting Time of Tunnels in the Xigeda Stratum Based on the Convergence-Confinement Method

Mechanical analysis of the structure of longwall mining hydraulic support

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