Dynamic responses of underground openings with end weakened by holes and anchor top reinforced by dense rock bolts under different explosion forces
WANG Guangyong1,CHEN Anmin2,XU Jingmao2
1.School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;
2.The Third Research Institute of The Corps of Engineers,General Staff of PLA,Luoyang 471023,China
Based on model tests, dynamic responses of underground openings with end weakened by holes and anchor top reinforced by dense rock bolts were studied under different explosion forces. The results showed that with increase in scaled distance, peak pressure stress on vault, relative peak displacement between vault and footwall, maximum peak strain and peak acceleration on vault of three underground openings gradually decay according to a power function, respectively, and the corresponding power function curves were fitted; with decrease in scaled distance, the fitted curve for the vertical peak compressive stress of the measured point nearest to the underground opening with anchor top reinforced by dense rock bolts and that of the underground opening with anchor top reinforced by long-dense rock bolts almost coincide, and the vertical peak compressive stress of the underground opening with end weakened by holes is bigger than those of the other two underground openings at the same scaled distance firstly, and then changes to be smaller, and when the scaled distance is 0.6 m•kg-1/3, the vertical peak compressive stresses of three underground openings are equal; with decrease in scaled distance, the relative peak displacements of the underground opening with end weakened by holes and that of the underground opening with anchor top reinforced by dense rock bolts are gradually close to that of the underground opening with anchor top reinforced by long-dense rock bolts, and when the scaled distance is less than 0.8 m•kg-1/3, both of them begin to exceed the latter; with decrease in scaled distance, fitting curves for the maximum peak strain of the underground opening with anchor top reinforced by dense rock bolts and that of the underground opening with anchor top reinforced by long-dense rock bolts are similar, and the maximum peak strain of the underground opening with end weakened by holes is smaller than that of the underground opening with anchor top reinforced by long-dense rock bolts at the same scaled distance firstly, and then changes to be bigger; with decrease in scaled distance, the peak acceleration on vault of underground opening with anchor top reinforced by dense rock bolts is smaller than that of the underground opening with anchor top reinforced by long-dense rock bolts at the same scaled distance firstly, and then changes to be bigger, the turning point between the two states is the scaled distance of 1.55 m•kg-1/3 .
王光勇1，陈安敏2，徐景茂2. 不同爆炸力作用下端部消波和加密锚杆支护洞室动态响应研究[J]. 振动与冲击, 2018, 37(15): 185-190.
WANG Guangyong1,CHEN Anmin2,XU Jingmao2. Dynamic responses of underground openings with end weakened by holes and anchor top reinforced by dense rock bolts under different explosion forces. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(15): 185-190.
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