Cumulative damage feature analysis for shared rock in a neighborhood tunnel under cyclic explosion loading
CAO Feng1,2,3， LING Tonghua1， LI Jie4,HUANG Fu1
1.School of Civil Engineering,Changsha University of Science and Technology,Changsha 410114,China;
2.Hunan Provincial Higher Institutions’Key Lab of Bridge Engineering,Changsha University of Science and Technology,Changsha 410114,China;
3.Hunan Provincial Communications Planning，Survey and Design Institute Company Limited，Changsha 410008，China；
4.School of Architectural Engineering,Xinyu University,Xinyu 338004,China
Abstract：To study the effects of cyclic blast loading on shared rock in a neighborhood tunnel,taking Liuyuetian bifurcation tunnel as the engineering background,a 3D model of the bifurcation tunnel was constructed using the finite element software LS-DYNA.Based on the HJC constitutive model,the damage variable was introduced to simulate the cumulative damage evolution process of the remained rock in the neighborhood tunnel under cyclic blast loading,and explore the relation among shared rock’s damage degree,damage range and explosion number.According to the decay law of mass point vibration velocity in the damage zone,the relation among single blasting charge,the maximum damage range and the critical damage mass point peak vibration velocity was established through data fitting.Finally,the simulation results were compared with those of acoustic wave tests on site to verify the rationality and correctness of the numerical simulation results.The results showed that the numerical simulation results agree well with those of tests on site,and the maximum damage zone appears on arch shoulder of shared rock; compared with a single blasting,the cumulative damage range caused by cyclic blasting excavations increases obviously,while the critical damage mass point peak vibration velocity drops significantly.
曹峰1,2，3，凌同华1，李洁4，黄阜1. 循环爆破荷载作用下小净距隧道中夹岩的累积损伤特征分析[J]. 振动与冲击, 2018, 37(23): 141-148.
CAO Feng1,2,3， LING Tonghua1， LI Jie4,HUANG Fu1. Cumulative damage feature analysis for shared rock in a neighborhood tunnel under cyclic explosion loading. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(23): 141-148.
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