Failure Mechanism and Optimization of Arch‐Bolt Composite Support for Underground Mining Tunnel

Mei, Yuchun; Li, Weiteng; Yang, Ning; Wang, Gang; Li, Tingchun; Sun, Lin

doi:10.1155/2020/5809385

Cited by 5 publications

(5 citation statements)

References 21 publications

(25 reference statements)

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“…Due to the fact that roadway II is a preparatory excavation, V max = 8 m/s. After specifying the value of the actual, minimum and maximum velocities, they were inserted into Equation (9), which shows that the ventilation criterion for the driven excavation was met because 0.15 ≤ 4.87 ≤ 8 m/s.…”

Section: Ventilation Criterionmentioning

confidence: 99%

“…Preparatory workings are located in an environment with many geological factors, such as continuous and discontinuous deformations, high stresses and natural hazards [1], including the impact of remains and operating edges [2] that contribute to additional loads on mining supports. Both the roadways and inclined drifts are supported by an independent arch yielding support [3]; rock bolt and cable support [4][5][6], including steel arch and bolts [7,8]; and shotcrete [9,10], or new solutions are sought with the use of a hydraulic support [11]. The previously used steel sets support is often exposed to the influence of saline mine waters [12].…”

Section: Introductionmentioning

confidence: 99%

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Choice of the Arch Yielding Support for the Preparatory Roadway Located near the Fault

et al. 2022

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The article presents a method of selecting an arch yielding support for preparatory workings driven in a hard coal seam. Particular attention was paid to discontinuous deformation in the form of a fault, which significantly contributes to the change of the excavation protection schemes. On the basis of the geometry of the machines and devices in the designed excavation, the support was selected, which was then checked for the ventilation criterion. In the next stage, analytical calculations were carried out using the determined spacing of the steel support in the fault zone and the area outside of it. Additionally, using the RS3 numerical software based on the finite element method, a rock mass model with a fault was built, through which the preparatory excavation passes. The aim of the research was to determine the total displacements occurring in the fault crossing zone for the excavation without support and with the use of steel arch yielding and with additional reinforcement in the form of straight segments. In conclusion, it was found that the variants of the excavation reinforcement can be modeled and selected in advance, which allows for the fastest possible execution of the driving and the maintenance of the minimum movement dimensions while passing through the fault.

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Section: Ventilation Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Choice of the Arch Yielding Support for the Preparatory Roadway Located near the Fault

et al. 2022

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“…Zhang Xiaonan et al [5] studied the compressive and flexural mechanical properties of CFST circular supports through laboratory tests and numerical simulation, which can provide a reference for the structural system. Mei Yuchun et al [6] used the improved numerical simulation method to analyze the support mechanical properties of bolt combined support mining roadway and completed the engineering verification in high geo-stress soft rock roadway. Hou Hetao et al [7] studied the mechanical characteristics of thin-walled concrete-filled steel tubular arch in tunnel support and developed a new type of plug-in grouting joint.…”

Section: Introductionmentioning

confidence: 99%

Research on Influence Factors of Bearing Capacity of Concrete-Filled Steel Tubular Arch for Traffic Tunnel

2022

Symmetry

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When a traffic tunnel passes through special strata such as soft rock with high geo-stress, expansive rock, and fault fracture zones, the traditional supporting structure is often destroyed due to complicated loads, which threatens the construction and operation safety of tunnel engineering. Concrete-filled steel tubular (CFST) structure gives full play to the respective advantages of steel and concrete and has better bearing capacity and economic benefits than traditional support structure, which has achieved good results in some underground engineering applications. In order to promote the application of CFST in the construction of traffic tunnels with complex geological conditions and improve the bearing capacity of the initial supporting structure of tunnels, the influencing factors of the bearing capacity of CFST arch were studied by numerical simulation. The main achievements are as follows: (1) The load-displacement curves of CFST members under different material parameters are basically consistent. CFST members have significant restrictions on displacement in the elastic stage and have high ultimate bearing capacity. Although the bearing capacity decreases obviously after reaching the peak, it shows good extension performance. (2) The height of the steel tube section, the thickness of the steel tube wall and the grade of the core concrete have an approximately linear positive correlation with the bearing capacity of CFST arch, but the influence of these three factors on the bearing capacity of CFST arch decreases in turn, and when the grade of core concrete increases above C50, it has no significant effect on the bearing capacity of members.

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“…The full-length anchoring bolt can not only provide the surface force but also effectively prevent the deformation of the shallow surrounding rock of the roadway, which has become a powerful measure to improve the support strength. However, because of the complexity of the surrounding rock stress distribution of a rectangular roadway, the stress of its full-length anchoring bolt is obviously different from that of regular section roadways such as circular, oval, and straight wall semicircular arch, which has attracted the attention of many coal mine engineers and technicians (Lv et al, 2018;Mei et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Stress Distribution Law of Full-Length Anchorage Bolt in Rectangular Roadway

Pang

et al. 2022

Front. Earth Sci.

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To study the evolution law of axial force and shear stress of a full-length anchorage bolt in a rectangular roadway during roadway driving and working face mining, based on the stress analysis of the bolt, considering the elastic parameters and geometric size of the bolt, the effect of a bearing plate on surrounding rock, roadway cross-section shape, roadway deformation degree, and roadway elastic parameters, elastic mechanics and mathematical analysis methods were used to establish the mechanical model describing the interaction between the bolt and surrounding rock, and the mechanical formulas for calculating the axial force and shear stress of the bolt were derived. Taking the mining roadway of 1,131(1) working face in the Zhujidong coal mine of the Huainan mining area as the engineering background, the axial force and shear stress of the bolt in the middle of the roof and side of the rectangular roadway with the advance of driving face and working face were analyzed. The mechanical model and theoretical analysis results are verified by installing force measuring bolts with the same mechanical properties as the field and observing the real axial force distribution of the bolts.

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Failure Mechanism and Optimization of Arch‐Bolt Composite Support for Underground Mining Tunnel

Cited by 5 publications

References 21 publications

Choice of the Arch Yielding Support for the Preparatory Roadway Located near the Fault

Choice of the Arch Yielding Support for the Preparatory Roadway Located near the Fault

Research on Influence Factors of Bearing Capacity of Concrete-Filled Steel Tubular Arch for Traffic Tunnel

Stress Distribution Law of Full-Length Anchorage Bolt in Rectangular Roadway

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