格子坝拦挡黏性泥石流闭塞过程及其闭塞判识实验研究

doi:10.13722/j.cnki.jrme.2018.0228

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Abstract Blocking degree is one of the important features when open type check dam intercepts debris flow，which determines the debris flow control benefits of check dam. So far，the design of grid-type dam trapping viscous debris flow is still in the experience stage，and there are few research on blocking type and blocking criterion. There is no theoretical basis and technical index，which urgently needs to be solved for debris flow preventing engineering design. Through the flume experiment and theoretical analysis，we study the blocking process and blocking recognition of viscous debris flow by a grid-type dam. The degree of blocking was affected by bulk density of debris flow，grid size of dam and flume slope. There are three kinds of blocked types of grid-type dam for viscous debris flow，which are total-blocked type，part-blocked type and opening type. In this study，a critical comprehensive criterion (F) of blocking performance of grid-type dam is proposed. Experimental results show that when F≤0.99，the type of blocking is total-blocked type；when 0.99＜F＜2.92，the type of blocking is part-blocked type；when F≥2.92，the type of blocking is opening type. Finally，based on the experimental data，this paper presents the empirical formula for the quantitative calculation of the blocking degree of grid-type dam，which can be used to recognize blocking degree of grid-type dam and design of grid size of grid-type dam. And the practical value of the empirical formula is illustrated，which can provide the technical support for practical engineering applications further.

Key words： geological engineering viscous debris flow grid-type dam；blocking process blocking critical comprehensive criterion blocking degree

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	Articles by authors
	YUAN Dong1
	2
	3
	LIU Jinfeng1
	2
	YOU Yong1
	2
	ZHOU Wenbing1
	2
	3
	JIAO Liang1
	2
	3

Cite this article:

YUAN Dong1,2,3, et al. Experimental study on characteristic of blocking process and blocking recognition of grid-type dam by viscous debris flow[J]. , 2019, 38(S1): 2881-2888.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0228 OR http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2881

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