隧道穿越防护通道受不同钻爆方式作用下岩体动态回应分析

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Abstract Based on the example of Shijingshan railway tunnel excavation beneath crossing a closely located antiaircraft tunnel,the tunnel blasting was simulated by using the Hypermesh combining with the ANSYS 16.0/LS-DYNA,considering the effect of fluid-solid coupling.The constitutive models for three different blasting types were established,i.e.,the vertical delay blasting,vertical hole simultaneous blasting and inclined hole delayed blasting.For the vertical delay blasting type,by superposition comparison,a real vibration wave shape and the corresponding mass points numerical simulated vibration waveform were contrasted to test the effectiveness of the simulation.According to the response changing principke at the asymmetric centre of rocks,the vibration velocity and the acceleration attenuation at points P1 and P2 on the antiaircraft tunnel under the three different blasting types were investigated.Through the comparison of the vibration waveform,vibration velocity,acceleration curve and peaks between real conditions and simulation ones,the optimal cuthole blasting type can be found out.The results provide references to the structure design for railway tunnel excavation crossing existing construction,blasting parameters selection and excavation method design.

Key words： tunnel blasting vertical hole excavation inclined hole excavation delayed blasting dynamic response

Received: 27 July 2017 Published: 15 January 2019

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	ZHAO Licai
	YU Jianxing

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ZHAO Licai,YU Jianxing. Analysis on rock dynamic responses for the tunnel excavation beneath crossing a protection channel under different blasting types[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(2): 211-218.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I2/211

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