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Mu C.-M.,Anhui University of Science and Technology | Mu C.-M.,Hunan University of Science and Technology | Mu C.-M.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education | Ren H.-Q.,The Third Research Institute of Engineers of the General Staff | Shi B.-M.,Anhui University of Science and Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2016

In order to investigate the acceleration of concrete at different scaling depth of burst (SDOB), an empirical formula of impact acceleration was deduced by using the combination of free field experiment and dimensional analysis, together with inducting the concept of DOB coefficient of equivalent yield. The results show that when SDOB is form 0.25 m/kg1/3 to 1.0m/kg1/3, the peak of impact acceleration of C30 concrete at blasting point increases along with the increases of SDOB, but the attenuation of shock acceleration of concrete is almost in the same way at different SDOB. The peak of impact acceleration increases with the increase of concrete strength, and the attenuation of acceleration is also in concert for different concrete strength. The obtained empirical formula for C30 concrete is of high degree of accuracy for predicting the shock acceleration. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.


Rong L.-F.,Anhui University of Science and Technology | Mu C.-M.,Anhui University of Science and Technology | Mu C.-M.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education | Zhang W.-Q.,Anhui University of Science and Technology | Zhang W.-Q.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

The uniaxial impact compression test of coal rock in 13-1 coal seam from Panxie coalfield was conducted under different strain rates by using Split Hopkinson Bar (SHPB). The results show that the coal rock dynamic stress-strain curves take on dynamic characteristics such as strain hardening and strain rate hardening, and both of peak stress and dynamic elastic modulus of coal rock increase as the strain rate increases. The relationship between the peak strength of coal rock and strain rate was obtained from the test data. Based on experimental results, the constitutive equation was established by modifying Z-W-T constitutive model to reflect the dynamic stress-strain relationship of coal rock before peak stress. Being obtained through data fitting, the constitutive parameters indicate that coal rock is sensitive to the response of high strain rate, and under high strain rates, gas coal demonstrates a brittle feature more obviously than anthracite. VUMAT subroutine was developed by using Fortran language, and the SHPB experiment of coal rock was numerically simulated. The simulation results are in good agreement with those obtained by experiment. ©, 2015, China Coal Society. All right reserved.

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