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| INVESTIGATE ON SHOCK STRESS PROPAGATION IN CONCRETE AT DIFFERENT DEPTHS UNDER BLASTING |
| LI Zhongqing1,2,MU Chaomin1,2,SHI Biming1 |
1.School of Energy Resources and Safety,Anhui University of Science and Technology,Huainan 232001,China;
2.Key Lab of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education,Huainan 232001,China |
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Abstract In order to study blasting stress propagation in concrete at different depths,through free field experiment and dimensional analysis,the propagation patten of stress induced by explosion in concrete at different SDOB(scaling depths of burst) was explored,and the empirical formulate of impact stress was deduced by using DOB(depths of burst) coefficient of equivalent yield.It is shown that the comparatively accurate empirical formulate of C30 concrete to predict shock stress was obtained.The results show that when SDOB is from -0.25 m/kg1/3 to 1.0 m/kg1/3,impact stress of C30 concrete under blasting peak stress increases with SDOB,but attenuation of shock stress in concrete is in coherent at different SDOB.With different concrete strength,impact stress increases with concrete strength enhancing,but attenuation of stress is basicly the same.
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Received: 03 April 2015
Published: 15 March 2017
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