Dynamic caustics test of blast load impact on neighboring different cross-section roadways |
| |
| Affiliation: | 1. School of Mechanics and Architecture Engineering, China University of Mining & Technology, Beijing 100083, China;2. State Key Laboratory for Geomechnics & Deep Underground Engineering, Beijing 100083, China;1. Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control, Shandong University of Science & Technology, Qingdao 266590, China;2. College of Mining & Safety Engineering, Shandong University of Science & Technology, Qingdao 266590, China;3. Department of Mining Engineering, Colorado School of Mines, CO 80402, USA;1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;2. School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Coal Resources and Safety Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China |
| |
| Abstract: | Using digital laser dynamic caustics experimental system and conducting simulation experiment researched the influence rule of blasting excavation of a new roadway on neighboring existed different cross-section roadways. The experimental results show that the influence of blast load on adjacent roadway has a good relationship with the cross-section of roadway. The expansion distance of precrack existed in circular, arch-wall, rectangular roadway is respectively 1.76, 1.61 and 0 cm under blast load.At the same time, the direct-blast side of rectangular roadway has more obvious damage compared with circular and arch-wall roadway. It explains that plane reflects more stress wave than arc, so that it exerts more tensile failure in the direct-blast side, which leads to less stress wave diffracting to the precrack in the back-blast side. When the precrack extends, higher value dynamic stress intensity factor in circular roadway works longer than that of arch-wall roadway. Indirectly, it explains that plane's weakening function on stress wave is significantly stronger than arc. Stress wave brings about self-evident influence on the upper and bottom endpoints of the rectangular roadway, and it respectively extends 1.03, 2.06 cm along the line link direction of the center of the blasthole and the upper and bottom endpoints on the right wall. |
| |
| Keywords: | Dynamic caustics Blast load Different cross-section roadways Precrack Dynamic stress intensity factor |
| 本文献已被 CNKI ScienceDirect 等数据库收录！ |
|
