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Study of grouting effectiveness based on shear strength evaluation with experimental and numerical approaches

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Abstract

Grouting is an important and convenient technique to improve rock properties. The grouting effectiveness depends on quantities of complex influencing factors. The investigation on the effects is essential for engineering applications. This study focuses on the evaluation of shear strength with experimental and numerical approaches. Firstly, the shear test of rock sample with cement grouting was carried out. Based on the tests, the numerical modelling of grouting was conducted. The effect of normal stress, grouting thickness and strength parameters of grout on the shear strength was studied, respectively. Then, the critical condition of effective grouting was proposed. Lastly, the mechanism in the influencing factors was discussed. Results show that the strength of grouted rock could be improved by increasing the normal stress and the grout parameters and decreasing the grouting thickness. The critical condition of effective grouting involves the grouting thickness and the strength parameters of grouting material. When the condition of effective grouting is satisfied, the grouting effect would be remarkable with additional supports, such as bolts. According to the opening of the dominant structural plane, the grouting parameters should be reasonably designed to meet the critical condition. The results could provide experimental and theoretical methodologies for the grouting design.

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Acknowledgements

We gratefully acknowledge financial support from the National Natural Science Foundation of China (NSFC) (Grant No. 51704097, 51709113), Key Research and Development Program of Henan Province, China (Grant No. 202102310244) and Science Foundation of Henan Polytechnic University (J2021-2). Besides, the authors are also grateful to the anonymous reviewers for their many helpful comments, which have greatly improved this paper.

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Authors and Affiliations

  1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China

    Zhen Li, Jiachen Liu & Wenhao Shi

  2. College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China

    Rongchao Xu

  3. Zhejiang Engineering Geophysical Prospecting and Design Institute Company Limited, Hangzhou, 310005, China

    Huoxing Liu

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  1. Zhen Li
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  2. Jiachen Liu
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  5. Wenhao Shi
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Correspondence to Rongchao Xu.

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Li, Z., Liu, J., Xu, R. et al. Study of grouting effectiveness based on shear strength evaluation with experimental and numerical approaches. Acta Geotech. 16, 3991–4005 (2021). https://doi.org/10.1007/s11440-021-01324-4

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  • DOI: https://doi.org/10.1007/s11440-021-01324-4

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