Development of a new deformation-controlled rock bolt: Numerical modelling and laboratory verification

Yokota, Yasuhiro; Zhao, Zhiye; Nie, Wen; Date, Kensuke; Iwano, Kaoru; Koizumi, Yu; Okada, Yuko

doi:10.1016/j.tust.2020.103305

Cited by 51 publications

(14 citation statements)

References 16 publications

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“…Wang et al [7] studied the Energies 2022, 15,1916 2 of 17 applicability of an energy-absorbing support system, comparing the support performance with that of an ordinary rock bolt support under the same simulated geologic conditions. He et al [8] and Yokota et al [9] developed an energy-absorbing bolt that can be used to prevent rockburst and large deformation. Chen et al [10] and Wu et al [11] evaluated the supporting effect of an energy-absorbing bolt from the angle of mechanical-worktransfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Using Energy-Absorbing Dampers to Solve the Problem of Large Deformation in Soft-Rock Tunnels: A Case Study

2022

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The commonly used strength design concept of tunnel support structures is inadequate to address the large deformation of soft rock. This study designed a series of energy-absorbing dampers (EDs) with low stiffness and high deformation capacity based on the energy principle. The ED was directly installed on the steel arch, which used its compression deformation to release the surrounding rock pressure and absorb the surrounding rock deformation to ensure the stability of the initial support structure. A compression test analyzed the ED’s mechanical properties, optimizing the structural parameters. The preliminary test results showed that the arc energy-absorbing damper’s (AED-I) peak strength (15.33 Mpa) was lower than the standard compressive strength of C25 shotcrete, with a safety factor of 1.63. The AED-I’s maximum compression ratio was 73.20%. To further improve the AED-I’s reliability and ability to absorb the deformation of surrounding rock, the bending radius of the AED-I’s energy-absorbing steel plate was reduced from 1800 mm to 1300 mm. After optimization, the AED-IO’s peak strength was reduced to 10.5 Mpa, and the safety factor increased to 2.38. The maximum compression ratio of the AED-IO also increased to 75.79%. The AED-IO has been applied to treat the large deformation of soft rock in the Zhongshao Tunnel on the Yuchu Expressway. Compared with a traditional support method, the maximum surrounding rock pressure was only 0.13 Mpa in the section where the AED-IO was applied. The maximum steel arch stress was 122.26 Mpa, far less than its uniaxial compressive strength. The application of the AED-IO ensures the stability of the initial support structure. Meanwhile, using an AED-IO saves CNY 24,323.85 per meter and reduces waste emissions by 20 tons.

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Section: Introductionmentioning

confidence: 99%

Using Energy-Absorbing Dampers to Solve the Problem of Large Deformation in Soft-Rock Tunnels: A Case Study

2022

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“…Consequently, extensive research works were accomplished in connection with designing rock support in excavations. As a result, several innovative supporting devices and methods of design of rock supports and have been proposed over the past few years and include numerical modeling (Boon et al 2015;Hu et al 2019;Nie et al 2018), empirical charts (Barton et al 1974;Chan and Einstein 1981;Rehman et al 2019), analytical methods including the key block theory (Fu and Ma 2014;Zhang et al 2020;Zou and Zhang 2019); probabilistic methods (Lü et al 2012;Oreste 2005); expert systems (Madhu et al 1995); lab and in-situ testing and monitoring (Bjureland et al 2019;Li 2006;Napa-García et al 2017;Wu et al 2019;Yokota et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Rock Supports in Underground Mine Drifts: A Case Study

2021

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Support failures in mine drifts represent potential hazards threatening underground mine safety and productivity. The aim of this study is to determine the reliability index associated with the rock supporting elements used in Ridder-Sokolny mine, an underground mine located in East Kazakhstan. Numerical simulations of the drift support and the first order reliability method (FORM) were employed to carry out the analysis. Several support cases were considered including; shotcrete, bolting, concrete, and combined bolting and concrete as well as unsupported drift case. For each support case, the factors of safety (FS), the reliability index (β) and the probability of failure (PF) were determined in accordance with the corresponding rock mass quality and excavation geometry. The results indicated the average FSs varied little for the different support cases (except for shotcrete); while β and PF vary more significantly between 0.62-3.25 and 0.05-27 (×10 3 %) factor depending on the rock conditions and support installed. The probability of failure of the rock support increases with a decrease in the rock mass quality. Similar trends were observed with an increase of the width/height ratio of the excavations for the same rock domain. These results illustrated that a single FS value obtained from a deterministic method may not always provide a sufficient indication of safety. This is in agreement with the field observations (many of the supports failed). Hence, on the basis of the reliability index of the supports, the requirement in terms of coefficient of variability of the rock mass quality to meet the target performance level was proposed. It is concluded that the results of this study could help improving the drift support design in Ridder-Sokolny mine.

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“…Because of variable geological condition and heterogeneous rock mechanical properties in coal mining, the fracturing problems of coal rocks under mining-induced stress can mostly be regarded as noncontinuous large deformation problems (Wang et al, 2020;Yokota et al, 2020). Currently, investigating the fracture caving characteristics of overlying stratum only with the use of computer numerical simulation is limited to certain degree (Ju et al, 2019;Regassa et al, 2018), which cannot fully and accurately reproduce the movement rules of the overlying stratum during the mining in the working face.…”

Section: Introductionmentioning

confidence: 99%

Development of a rotatable similar simulation experimental system for steep coal seam mining

Huang

Guo

2021

JEDT

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Purpose Currently, the existing similar simulation is still limited in the following aspects: un-rotatable laboratory devices, the difficulty in the pavement on steep seams and great error of the experimental data. Design/methodology/approach To address above-mentioned problems, this study combined theoretical analysis and numerical simulation and developed a rotatable experimental system for similar simulation on steep coal seam mining on the premise of ensuring experimental safety. Findings The present experimental system mainly consists of the model support, the rotation system and the bearing system. By taking into account the experimental requirements and actual laboratory space, the sizes of the model support and the bearing system were determined. Considering the requirements in space limit and rotation stability, the rotation mode of vertical sliding on the left side and the horizontal sliding on the lower side was designed. Originality/value Using programmable logic controller automatic angle control technology, the rotation angle, velocity and displacement of the model can be automatically adjusted and controlled so as to achieve safe rotation and precise control. Finally, the calculation method of the mass of the required similar materials for paving the coal strata at different inclination angles and in different horizons was analyzed, and the related mass proportion calculation software was developed.

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Development of a new deformation-controlled rock bolt: Numerical modelling and laboratory verification

Cited by 51 publications

References 16 publications

Using Energy-Absorbing Dampers to Solve the Problem of Large Deformation in Soft-Rock Tunnels: A Case Study

Using Energy-Absorbing Dampers to Solve the Problem of Large Deformation in Soft-Rock Tunnels: A Case Study

Reliability Analysis of Rock Supports in Underground Mine Drifts: A Case Study

Development of a rotatable similar simulation experimental system for steep coal seam mining

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