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| Influence of static load on dynamic mechanical properties and stress wave propagation of jointed coal rock masses |
| YIN Zhiqiang1，WANG Jianen2，ZHANG Zhuo3，CHANG Jucai2，SHI Wenbao2 |
| (1. Coal Mine Safety Mining Equipment Innovation Center of Anhui Province，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. School of Mining Engineering，Anhui University of Science and Technology，
Huainan，Anhui 232001，China；3. Tongguan Mine Construction Co.，Ltd.，Tongling Nonferrous Metals Group，
Tongling，Anhui 244002，China)
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Abstract To investigate the dynamic mechanical properties and stress wave propagation law of coal rock mass under the action of in-situ stress and joints，the dynamic compression tests of coal rock under different static loads (0，2，4，6 and 8 MPa) and different joint coincidence coefficients(JMC：0.8，0.9，1.0 and no joint) were carried out on modified split Hopkinson pressure bar(SHPB) coupled static and dynamic loads by using artificial joint specimen. The results show that，with the decrease of joint match coefficients，the amplitude of the reflected wave increases，and the transmitted wave decreases. With the static load increased from 0 MPa to 8 MPa，the transmission coefficients of samples with different joint match coefficients increase，and the smaller the joint match coefficients，the greater the increase of transmission coefficient. The influence of static load on the transmission coefficient of samples with low joint match coefficients was more obvious. The peak stress increases with the increase of static load，while the peak strain decreases with the increasing static load. The specific stiffness and dynamic modulus of the joint specimen increase with the increasing static load. It shows that the existence of static load inhibits the deterioration of jointed coal and rock mass. Based on the stress-strain relationship and the standard linear solid model，the experimental results are verified. With the increase of static load and joint coincidence coefficients，the seismic wave quality factor increases，and the sample dissipated energy decreases. It is considered that more attention should be paid to the influence of joint and static load on the transmission characteristics of stress waves in underground engineering.
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2022, Vol. 41 
