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Study on Properties of Grouting Materials and Reinforcement Effect in Coal Roadways Influenced by Dynamic Pressure

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Abstract

In order to study the occurrence mechanism of rock burst in coal roadways under the influence of mining activities, the study took five main coal roadways in Yuwu Colliery as an engineering background. The occurrence mechanism of rock burst was analyzed by theory of dynamic and static combined load. Furthermore, based on the prevention mechanism of weak-strong structure, this paper puts forward to use a hierarchical coupled grouting method to reinforce the cataclastic surrounding rock of main coal roadways, and the laboratory test results show that slurry properties of superfine cement is better than that of regular cement. The numerical simulation law of slurry diffusion shows that the water-cement ratio and fracture aperture have obvious influence on the final diffusion distance, but the grouting pressure almost has no effect on it. A bolt-mesh-cable and grouting combined reinforcement method was applied in the five main coal roadways, and the borehole observation and deformation monitoring results show that the control effect of surrounding rock is satisfactory and the rock burst accidents caused by mining disturbance are effectively prevented. The study conclusions provide theoretical foundation and a new guidance for preventing rock burst in coal roadways.

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Acknowledgements

The work is supported by the Key Project of National Natural Science Foundation of China (No. 51634001), National Natural Science Foundation of China (Nos. 51574243, 51404269 and 51674253), the State Key Research Development Program of China (No. 2016YFC0801403) and the Key Research Development Program of Jiangsu Province, China (No. BE2015040).

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Authors and Affiliations

  1. Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huai’an, 223001, Jiangsu, China

    Zeng-qiang Yang, Yun Dong & Jing-ke Wu

  2. Department of Electronic Information and Physics, Changzhi University, Changzhi, 046011, Shanxi, China

    Zeng-qiang Yang

  3. Science & Technology Innovation Center, Coal Mining and Designing Department, Tiandi Science & Technology Co., Ltd, Beijing, 100013, China

    Chang Liu

  4. Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, Xuzhou, 221008, China

    Lin-ming Dou

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  1. Zeng-qiang Yang
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  2. Chang Liu
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  3. Yun Dong
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  4. Lin-ming Dou
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  5. Jing-ke Wu
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Correspondence to Chang Liu.

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Yang, Zq., Liu, C., Dong, Y. et al. Study on Properties of Grouting Materials and Reinforcement Effect in Coal Roadways Influenced by Dynamic Pressure. Geotech Geol Eng 37, 3329–3342 (2019). https://doi.org/10.1007/s10706-019-00847-8

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  • DOI: https://doi.org/10.1007/s10706-019-00847-8

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