框架型棚洞承受落石冲击力的模型试验研究

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Abstract A model experiment is performed to test the rockfall impact force applied to frame shed tunnels under the protection of different types of cushions embedded on tunnel roof slabs. The changing rule of impact force induced by rockfall is analyzed according to different impact energies and types of cushions embedded on shed tunnels. An enlargement coefficient reflecting the relationship between average impact force and maximum impact force is presented using experimental data and theoretical analysis. The improved method for calculating rockfall impact force can consider the many factors that affect this phenomenon. For a particular rockfall impact energy, the rockfall impact force with different types of cushion properties is affected by the cushion property function f~(h,E,μ,γ). A large f value equates to the minimal discreteness of the expansion coefficient of rockfall impact force under different types of cushion, and vice versa.

Key words： Tunnel engineering Frame shed tunnel Model test Rockfall impact force Cushion layer

Received: 21 September 2016

Fund:Supported by the National Natural Science Foundation of China (No.51378436); Ministry of Railway Science and Technology Rearch and Development Plan Project (No.2010G0018-C-1-3)

Corresponding Authors: LUO Fu-jun E-mail: 376414291@qq.com

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	LUO Fu-jun
	ZHOU Xiao-jun
	WANG Yuan
	ZHANG Fu-lin

Cite this article:

LUO Fu-jun,ZHOU Xiao-jun,WANG Yuan, et al. Experimental Study on Rockfall Impact Force Applied to Frame Shed Tunnels[J]. Journal of Highway and Transportation Research and Development, 2018, 12(2): 59-66.

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http://manu27.magtech.com.cn/Jwk_gljtkj_en/EN/ OR http://manu27.magtech.com.cn/Jwk_gljtkj_en/EN/Y2018/V12/I2/59

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