Investigation of the kinetic energy transformation pattern of gangue particles in a buffer system

Tai, Yang; Feng, Jie; Han, Xiao-Le

doi:10.1016/j.powtec.2018.12.077

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…In order to overcome the support difficulty of a deepburied soft-rock roadway, the floor heave control must be incorporated into the support system [34]. However, as previously discussed, in the initial open support system, the roadway was constructed with an arch section and the floor reinforcement and control was ignored, so the self-supporting capacity of surrounding rocks failed to be effectively manipulated and the support performance of the U-shaped steel could not be fully developed as analyzed in Section 3.…”

Section: Optimization and Design Of Soft-rock Roadway Support Under Complex Stress Fieldmentioning

confidence: 99%

A Case Study of Optimization and Application of Soft‐Rock Roadway Support in Xiaokang Coal Mine, China

Guo

Zhu

Liu

et al. 2021

Advances in Civil Engineering

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The roadway of S2S2 fully mechanized caving face (FMCF) in Xiaokang Coal Mine is one of the most typical deep-buried soft-rock roadways in China and had been repaired several times. In order to figure out the failure reasons of the original roadway support, the geological conditions were investigated, the surrounding rock stress was monitored, the rib displacement, roof separation, and floor heave were in situ measured, and the performance of the U-shaped steel support was simulated. The above analysis results indicated that the support failure was mainly caused by (1) the unreasonable arch roadway section, (2) the high and complex surrounding rock stress, (3) the failure control of the floor heave, and (4) the inadequate self-supporting capacity of the surrounding rock. For optimizing, the roadway section was changed to circle and a new full-section combined support system of “belt-cable-mesh-shotcrete and U-shaped steel-filling behind the support” was adopted, which could specifically control the floor heave, allow the roadway deformation in control, and improve the self-supporting ability and stress field of the surrounding rock. To determine the support parameters, the selected U-shaped steel support was verified by simulation, and various bolt-cable support schemes were simulated and compared. Finally, such an optimized support scheme was applied in the roadway of the next replacement FMCF. The in situ monitoring showed that the rib-to-rib convergence and roof-to-floor convergence were both controlled within 600 mm, which indicated that the roadway was effectively controlled. This case study has important reference value and guiding function for the optimal design of the soft-rock roadway support with similar geological conditions.

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Section: Optimization and Design Of Soft-rock Roadway Support Under Complex Stress Fieldmentioning

confidence: 99%

A Case Study of Optimization and Application of Soft‐Rock Roadway Support in Xiaokang Coal Mine, China

Guo

Zhu

Liu

et al. 2021

Advances in Civil Engineering

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“…The fixed constraint was added at the bottom of the model, and the symmetry constrain was used in the model. To simulate the mutual contacts among the components, eight sets of contact were defined 49 . Table 2 shows the specific material parameters.…”

Section: The Numerical Model Of the Yielding Boltmentioning

confidence: 99%

The mechanism of decrease in bearing capacity and performance evaluation of the yielding bolt in coal mine

Tai

Huang

Xia

et al. 2020

Energy Science & Engineering

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With the increase of the coal mining depth, the surrounding rock shows characteristics of high stress and large deformation. However, the traditional bolt could not adapt to this surrounding rock environment and become invalid due to low elongation. In order to solve the problem, the new type of yielding bolt has been designed. It could release the deformation energy of the surrounding rock through its yielding pipe. However, few studies have been reported on the mechanism in bearing capacity decrease of the yielding pipe. Furthermore, the evaluation of the yielding bolt was not fully understood. Under such a background, a numerical model of the yielding model was established. According to the numerical simulation, the mechanism of the decrease in the bearing capacity of the yielding bolt is that the buckling occurs at different positions of the yielding pipe, making the material stiffness matrix turn negative, and the bearing capacity decreases significantly. Also, the performance of the yielding bolt could be evaluated from the use efficiency of the yielding pipe, the plastic strain characteristics of the components of the yielding bolt, and the energy absorption law. The evaluation results indicated that: (a) the deviation of the yielding pipe's Mises stresses was within the range of 1.0%‐4.0%. The stresses were distributed evenly, and the material use efficiency was high; (b) only the yielding pipe occurred the plastic failure during the yielding process, and other components were at the elastic stages. After the yielding, the yielding bolt was still effective for support. (c) The yielding pipe could absorb energy smoothly, which is helpful for the stability of the yielding bolt.

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“…The mechanical parameters of the intact coal and rock are obtained near the 1070 auxiliary transportation roadway by the experiment, as shown in Table . However, due to the large number of irregular joints and cracks in the rock mass in the stope, the rock parameters measured by the experiment are usually higher than the rock mass in the stope . In order to get the mechanical parameters of the rock mass in the stope, the integrity of the rock mass is generally evaluated by the borehole peep, which is characterized by the RQD value.…”

Section: The Deformation and Failure Mechanismmentioning

confidence: 99%

“…However, due to the large number of irregular joints and cracks in the rock mass in the stope, the rock parameters measured by the experiment are usually higher than the rock mass in the stope. 17 In order to get the mechanical parameters of the rock mass in the stope, the integrity of the rock mass is generally evaluated by the borehole peep, which is characterized by the RQD value. Then, the RQD value is used to reduce the strength of rock mass.…”

Section: Strength Reduction Of Rock Mass In Stopementioning

confidence: 99%

Failure mechanism of the large‐section roadway under mined zones in the ultra‐thick coal seam and its control technology

Tai

Xia

Meng

et al. 2019

Energy Science & Engineering

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Aiming at serious deformation and failure of large‐section coal roadway under mined zones in ultra‐thick coal seam, its deformation and failure characteristics are analyzed based on the field measurement. This paper reveals the mechanism of roadway roof separation, roof leakage, and right rib extrusion. Based on the mechanism, two kinds of secondary support schemes are proposed, that is, “grouting + I‐steel support + bolt” (scheme I) and “grouting + U steel support + anchor + anchor cable” (scheme II). The industrial experiment is carried out at 1070 auxiliary transportation roadway in Tashan Coal Mine. The measured results show that the roadway roof separations of the secondary support scheme I and II are only 1/11 and 1/46 of the original support scheme, respectively, while the lateral displacements of the roadway are only 1/7 and 1/44 of the original support scheme. It could be seen that the deformation and failure of the roadway surrounding rock have been well controlled.

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Investigation of the kinetic energy transformation pattern of gangue particles in a buffer system

Cited by 4 publications

References 16 publications

A Case Study of Optimization and Application of Soft‐Rock Roadway Support in Xiaokang Coal Mine, China

A Case Study of Optimization and Application of Soft‐Rock Roadway Support in Xiaokang Coal Mine, China

The mechanism of decrease in bearing capacity and performance evaluation of the yielding bolt in coal mine

Failure mechanism of the large‐section roadway under mined zones in the ultra‐thick coal seam and its control technology

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