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| Dynamic response characteristics of blasting strata in silt-rock stratum under different working conditions |
| YIN Tao1, ZHOU Chuanbo2, ZHENG Changqing3, JIANG Nan2, CHEN Zhengjin4 |
1.School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
2.Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China;
3.Zhuhai Baopoxin Research & Development Co., Ltd., Zhuhai 519099, China;
4.The First Engineering Company of CCCC Fourth Harbor Engineering Co., Ltd., Guangzhou 510310, China |
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Abstract The environment of blasting broken rock in silt-rock stratum is complex, boreholes are full of groundwater, and rock is subjected to silt pressure.Here, based on the study method of field tests combined with dynamic finite element numerical simulation, dynamic response characteristics of rock stratum under 3 working conditions of water coupling charge plus silt pressure, water coupling charge plus no silt pressure, air coupling charge plus silt pressure were studied.The study results showed that linear relations exist between peak value of rock stratum node’s vibration velocity vectors’ superposition and hole depth and between peak value of element pressure and hole depth, respectively under two working conditions of water coupling charge plus silt pressure and water coupling charge plus no silt pressure; the dynamic response of rock stratum is not affected by variation of hole depth under the working condition of air coupling charge plus silt pressure; the silt pressure has smaller effect on dynamic response of rock stratum.
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Received: 25 December 2019
Published: 15 June 2021
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