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Experimental Investigation on the Fatigue Mechanical Properties of Intermittently Jointed Rock Models Under Cyclic Uniaxial Compression with Different Loading Parameters

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Abstract

Intermittently jointed rocks, widely existing in many mining and civil engineering structures, are quite susceptible to cyclic loading. Understanding the fatigue mechanism of jointed rocks is vital to the rational design and the long-term stability analysis of rock structures. In this study, the fatigue mechanical properties of synthetic jointed rock models under different cyclic conditions are systematically investigated in the laboratory, including four loading frequencies, four maximum stresses, and four amplitudes. Our experimental results reveal the influence of the three cyclic loading parameters on the mechanical properties of jointed rock models, regarding the fatigue deformation characteristics, the fatigue energy and damage evolution, and the fatigue failure and progressive failure behavior. Under lower loading frequency or higher maximum stress and amplitude, the jointed specimen is characterized by higher fatigue deformation moduli and higher dissipated hysteresis energy, resulting in higher cumulative damage and lower fatigue life. However, the fatigue failure modes of jointed specimens are independent of cyclic loading parameters; all tested jointed specimens exhibit a prominent tensile splitting failure mode. Three different crack coalescence patterns are classified between two adjacent joints. Furthermore, different from the progressive failure under static monotonic loading, the jointed rock specimens under cyclic compression fail more abruptly without evident preceding signs. The tensile cracks on the front surface of jointed specimens always initiate from the joint tips and then propagate at a certain angle with the joints toward the direction of maximum compression.

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Acknowledgements

The authors are grateful for the financial support from the National Program on Key Basic Research Project (No. 2015CB057903) and National Natural Science Foundation of China (No. 51779164 and No. 51374149).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, Sichuan, China

    Yi Liu, Feng Dai, Nuwen Xu & Peng Feng

  2. PLA University of Science and Technology, Nanjing, 210007, Jiangsu, China

    Lu Dong

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  1. Yi Liu
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  2. Feng Dai
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  3. Lu Dong
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  4. Nuwen Xu
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  5. Peng Feng
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Correspondence to Feng Dai.

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Liu, Y., Dai, F., Dong, L. et al. Experimental Investigation on the Fatigue Mechanical Properties of Intermittently Jointed Rock Models Under Cyclic Uniaxial Compression with Different Loading Parameters. Rock Mech Rock Eng 51, 47–68 (2018). https://doi.org/10.1007/s00603-017-1327-7

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  • DOI: https://doi.org/10.1007/s00603-017-1327-7

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