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| Effect of dynamic loads and geo-stresses on response characteristics of rocks |
| JIN Jiefang，YANG Yi，LIAO Zhanxiang，YU Xiong，ZHONG Yilu |
(School of Civil and Surveying Engineering，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China)
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Abstract In the blasting process of underground rock mass，the geo-stresses and dynamic loads are different at different distances from the blasting source，which leads to different response characteristics of rocks. In order to study the influence of dynamic loads on the dynamic strength and deformation characteristics of rocks with different geo-stresses，a modified SHPB test device was used to carry out three-dimensional dynamic compression test on red sandstone by setting five impact velocities and five axial static stress levels respectively to simulate different dynamic loads and geo-stresses. The variation rules of average strain rate，dynamic peak stress(or dynamic compressive strength)，ultimate strain and dynamic deformation modulus of red sandstone under different impact velocities and static stress conditions were analyzed respectively，and the evolution empirical models of dynamic response parameters of red sandstone were built to characterize the dynamic response characteristics of rocks. The results show that：(1) the strain rate of red sandstone is affected by the impact velocity and the static stress，and the average strain rate decreases first and then increases with increasing the axial static stress and increases as a power function with the impact velocity，(2) under the same three-dimensional static load，the peak stress and ultimate strain of red sandstone increase by a power function with the impact velocity，(3) under the same impact velocity，with increasing the axial static stress，the peak stress of red sandstone increases as a power function and the ultimate strain also gradually increases，and (4) with increasing the axial static stress，the critical impact velocity and dynamic compression strength of red sandstone both increase first and then decrease. The research results are beneficial to the perfection of rock dynamics theory and the prediction of the response characteristics and stability of surrounding rock mass according to the type and amount of explosives in engineering blasting.
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2021, Vol. 40 
