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Effect of rock strength on failure mode and mechanical behavior of composite samples

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Abstract

Many dynamic events in coal mine are caused by the instability of coal–rock body. In order to study the influence of rock strength on this type of instability, uniaxial compression experiments of rock–coal–rock composite samples with different rock strengths are carried out, and the effect and mechanism of rock strength on the mechanical behavior and fracture mode of the composite samples are analyzed. The results show that major failure modes of the composite samples are conjugate X-shaped shearing fracture and splitting fracture. The angle between the shear fracture surface and the end face increases with rock strength. The splitting fracture in the coal body expands to the rock when the rock strength is low. The strength properties of the composite samples mainly depend on the coal strength instead of the rock strength. With the rock strength increasing, the peak strain of the composite samples decrease, and the differences from the coal strain and strain rate to rock strain and strain rate become greater. These failure modes and characteristics of deformation are shown to be determined by the difference between the elastic modulus of rock and coal constituting the composite samples.

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Acknowledgments

This research is financially supported by National Science and Technology Support Program (2012BAK09B01-04), the Youth Science Foundation of the National Natural Science Foundation of China (51304205) and High Lever Paper Special Fund Supported by China University of Mining and Technology (2012LWBZ08).

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Authors and Affiliations

  1. Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou, Jiangsu, China, 221116

    Enyuan Wang, Dazhao Song, Siheng Wang & Yue Niu

  2. Faculty of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, China, 221116

    Enyuan Wang, Dazhao Song, Siheng Wang & Yue Niu

  3. Department of Safety Engineering, Qingdao Technological University, Qingdao, Shandong, China, 266520

    Jie Liu

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  1. Jie Liu
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  2. Enyuan Wang
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  3. Dazhao Song
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  4. Siheng Wang
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  5. Yue Niu
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Correspondence to Enyuan Wang.

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Liu, J., Wang, E., Song, D. et al. Effect of rock strength on failure mode and mechanical behavior of composite samples. Arab J Geosci 8, 4527–4539 (2015). https://doi.org/10.1007/s12517-014-1574-9

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  • DOI: https://doi.org/10.1007/s12517-014-1574-9

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