碎屑流冲击下柔性防护网的力学简化模型

doi:10.13722/j.cnki.jrme.2021.0769

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Abstract Flexible barriers are a kind of protective structure widely applied in granular flow control，but there is no a comprehensive mechanical model to evaluate the protective characteristics of flexible barriers considering the composition of granular flow impact loads and the mechanical characteristics of supporting ropes. In this paper，a calculation model of the impact load of granular flow was established based on two kinds of impact modes of granular flow impact retaining structure and considering the composition of static，dynamic and frictional impact loads. Finally，combined with cable structure mechanics，a simplified mechanics model of flexible barriers considering the force characteristics of the supporting ropes and the combination of granular flow loads was constructed considering different impact stages and impact modes of granular flow. The comparisons between the calculation results by the proposed model with indoor chute model test results of granular flow impacting flexible barriers show that the impact load calculation results of the bottom support rope are larger than the experimental values，the calculation results of the impact load and the flexible barrier force under the slope accumulation condition are in agreement with the experimental results，and the calculation results under the continuous impact condition are greater than the experimental results. In general，the mechanical theoretical model can effectively describe the nonlinear distribution characteristics of the loads on the remaining support lines，and the calculation results are conservative.

Key words： disaster geology granular flow flexible barrier impact model mechanical model

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	Articles by authors
	WU Ze1
	JIANG Yuanjun2
	XIAO Siyou3
	XIA Xin2
	NING Po2

Cite this article:

WU Ze1,JIANG Yuanjun2,XIAO Siyou3, et al. A simplified mechanical model of flexible barriers under granular flow impact[J]. , 2022, 41(5): 1008-1019.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0769 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I5/1008

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