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Experimental Investigation on Rockbolt Performance Under the Tension Load

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Abstract

Rockbolt performance may vary differently under complex geological and stress conditions, especially dynamic disturbance at deep underground mining. Therefore, reinforcement mechanism needs to be further explored to improve the support effect of rockbolt. In this study, static and dynamic Brazilian splitting tests of steel bar reinforced red sandstones were carried out to investigate the rockbolt performance under tension load. The deformation changes on the specimen’s surface and the rockbolt were recorded during the test. The strengths and failure modes of unreinforced and reinforced Brazilian disc samples were investigated. The results show that the stress of bolt increases steadily during elastic deformation process, indicating that the bolt shares the tension loading, and increases sharply when the bear capacity of specimen descends caused by crack propagation, indicating that the load is transferred from sandstone specimen. Furthermore, most of the damaged reinforced samples were still bonded by rockbolt, when the test finished. Therefore, the reinforcement mechanism can be divided into two phases. The first phase is the intact rock stage, during which the bolt shares stress reinforcing the strength. The second phase is crack propagation stage, in which the bolt restricts the crack propagation and almost bears the load. Compared with the results of unreinforced samples, it can be seen that the bolt can reduce failure of rock and the strength of the reinforced samples is enhanced. The results may provide a reference for analysis of reinforced mechanism and design of rockbolts.

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Abbreviations

BD:

Brazilian disc

BDS:

Brazilian discs were loaded by static load

BDD:

Brazilian discs were loaded by dynamic load

RSS:

Reinforced specimens were loaded by static load

RSD:

Reinforced specimens were loaded by dynamic load

SEM:

Scanning electron microscope

SG:

Strain gages

SHPB:

Split Hopkinson pressure bar

E :

The Young’s modulus of the pressure bars

A :

The cross-sectional area of the bars

D :

The diameter of specimen

T :

The thickness of specimen

\(\varepsilon_{\text{I}} \left( t \right)\) :

The strain signals of the incident wave

\(\varepsilon_{\text{R}} \left( t \right)\) :

The strain signals of the reflected wave

\(\varepsilon_{\text{T}} \left( t \right)\) :

The strain signals of the transmitted wave

\(\sigma \left( t \right)\) :

The dynamic tensile strength

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Acknowledgements

The research in this paper was supported by the National Natural Science Foundation of China (51774130), the National Basic Research Program of China (2015CB060200), the National Natural Science Foundation of China (51774131, 51674116). The authors are very grateful to the financial contributions and convey their appreciation for the support to this basic research. The authors also thank Dr. Jingyu Shi from CSIRO Energy for his help in polishing the wording and writing as well as the two anonymous reviewers for their comments that improved the manuscript.

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Authors and Affiliations

  1. Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China

    Qiuhong Wu & Shuqing Li

  2. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China

    Qiuhong Wu & Shuqing Li

  3. School of Resources and Safety Engineering, Central South University, Changsha, 410083, Hunan, China

    Lu Chen

  4. CSIRO Energy, QCAT, Technology Court, 1, Pullenvale, QLD, 4069, Australia

    Lu Chen, Baotang Shen & Bongani Dlamini

  5. School of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China

    Yongjian Zhu

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  1. Qiuhong Wu
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  2. Lu Chen
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Correspondence to Lu Chen.

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Wu, Q., Chen, L., Shen, B. et al. Experimental Investigation on Rockbolt Performance Under the Tension Load. Rock Mech Rock Eng 52, 4605–4618 (2019). https://doi.org/10.1007/s00603-019-01845-1

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