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

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (34684 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要柔性防护网是一种广泛应用于碎屑流防治的防护结构，目前缺乏综合考虑碎屑流冲击荷载组成特征及支撑绳受力特征的力学模型对其防护特性进行评估。基于碎屑流冲击拦挡结构的2种冲击模式，并考虑动、静及摩擦冲击荷载的组成，构建碎屑流的冲击荷载计算模型，并在考虑碎屑流不同冲击阶段和冲击模式的基础上，结合索结构力学，建立考虑碎屑流荷载组成和支撑绳受力特征的柔性防护网力学简化模型。对比碎屑流冲击柔性网的室内滑槽模型试验结果发现，底部支撑绳冲击荷载计算结果比试验值偏大，坡面堆积工况下的冲击荷载和柔性网受力计算结果基本符合试验结果，而连续冲击工况的计算结果大于试验结果。总体上，力学理论模型可以有效地描述其余支撑绳上所受荷载的非线性分布特征，且计算结果偏保守。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	邬泽1
	姜元俊2
	肖思友3
	夏鑫2
	宁坡2

关键词 ：灾害地质学, 碎屑流, 柔性网, 冲击模型, 力学模型

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

引用本文:

邬泽1，姜元俊2，肖思友3，夏鑫2，宁坡2. 碎屑流冲击下柔性防护网的力学简化模型[J]. 岩石力学与工程学报, 2022, 41(5): 1008-1019.
WU Ze1，JIANG Yuanjun2，XIAO Siyou3，XIA Xin2，NING Po2. A simplified mechanical model of flexible barriers under granular flow impact. , 2022, 41(5): 1008-1019.

链接本文:

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

[6]	POULIQUEN O. Scaling laws in granular flows down rough inclined planes[J]. Physics of Fluids，1999，11(3)：542-548.
[1]	LI X，WU Y，HE S，et al. Application of the material point method to simulate the post-failure runout processes of the Wangjiayan landslide[J]. Engineering Geology，2016，212：1-9.
[3]	宋跃，姜元俊，王萌. 碎石垫层对碎屑流冲击棚洞的缓冲效应研究[J]. 岩石力学与工程学报，2018，37(10)：2 359-2 369.(SONG Yue，JIANG Yuanjun，WANG Meng. Buffering effect of gravel cushion layer on the impact of dry granular flow against a rock shed[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(10)：2 359-2 369.(in Chinese))
[5]	CAMPBELL C S，CLEARY P W，HOPKINS M. Large-scale landslide simulations：Global deformation，velocities and basal friction[J]. Journal of Geophysical Research：Solid Earth，1995，100(B5)：8 267- 8 283.
[12]	WENDELER C，VOLKWEIN A，ROTH A，et al. Hazard prevention using flexible multi-level debris flow barrier[C]// Interpraevent. [S. l.]：[s. n.]，2008：547-554.
[2]	XU Q，FAN X M，HUANG R Q，et al. Landslide dams triggered by the Wenchuan Earthquake，Sichuan Province，south west China[J]. Bulletin of Engineering Geology and the Environment，2009，68(3)：373-386.
[8]	KWAN J S H，KOO R C H，NG C W W. Landslide mobility analysis for design of multiple debris-resisting barrier[J]. Canadian Geotechnical Journal，2015，52(9)：1 345-1 359.
[9]	VOLKWEIN A，MELIS L，HALLER B，et al. Protection from landslides and high speed rockfall events：reconstruction of Chapman?s Peak Drive[C]// IABSE Symposium，Lisbon 2005：Structures and Extreme Events. [S. l.]：[s. n.]，2005：47-54.
[11]	肖思友，苏立君，姜元俊. 碎屑流冲击柔性网的离散元仿真研究[J].岩土工程学报，2019，41(3)：526-533.(XIAO Siyou，SU Lijun，JIANG Yuanjun. Numerical investigation on flexible barriers impacted by dry granular flows using DEM modeling[J]. Chinese Journal of Geotechnical Engineering，2019，41(3)：526-533.(in Chinese))
[13]	MARGRETH S，ROTH A. Interaction of flexible rockfall barriers with avalanches and snow pressure[J]. Cold Regions Science and Technology，2008，51 (2/3)：168-177.
[15]	BRIGHENTI R，SEGALINI A，FERRERO A M. Debris flow hazard mitigation：a simplified analytical model for the design of flexible barriers[J]. Computers and Geotechnics，2013，54：1-15.
[19]	FAUG T. Depth-averaged analytic solutions for free-surface granular flows impacting rigid walls down inclines[J]. Physical Review E，2015，92(6)：062310.
[21]	KOO R C H，KWAN J S H，NG C W W，et al. Velocity attenuation of debris flows and a new momentum-based load model for rigid barriers[J]. Landslides，2016，14 (2)：617-629.
[23]	JIANG Y J，ZHAO Y. Experimental investigation of dry granular flow impact via both normal and tangential force measurements[J]. Géotechnique Letters，2015，5 (1)：33-38.
[29]	LIU D C，YOU Y，LIU J F，et al. Spatial-temporal distribution of debris flow impact pressure on rigid barrier[J]. Journal of Mountain Science，2019，16(4)：793-805.
[4]	JIANG Y J，FAN X Y，SU L J，et al. Experimental validation of a new semi-empirical impact force model of the dry granular flow impact against a rigid barrier[J]. Landslides，2021，(18)：1 387-1 402.
[10]	SONG D，ZHOU G G D，XU M，et al. Quantitative analysis of debris-flow flexible barrier capacity from momentum and energy perspectives[J]. Engineering Geology，2019，251：81-92.
[14]	贺咏梅，成铭. 柔性防护技术在泥石流防护中的应用及研究进展[J]. 水土保持研究，2007，3(14)：292-294.(HE Yongmei，CHENG Ming. Research on the application of flexible system to mitigation of mudflow[J]. Research of Soil and Water Conservation，2007，3(14)：292-294.(in Chinese))
[20]	HE S，LIU W，LI X. Prediction of impact force of debris flows based on distribution and size of particles[J]. Environmental Earth Sciences，2016，75(4)，https://link.springer.com/article/10.1007/s12665-015- 5180-2.
[22]	JIANG Y J，TOWHATA I. Experimental study of dry granular flow and impact behavior against a rigid retaining wall[J]. Rock Mechanics and Rock Engineering，2012，46 (4)：713-729.
[24]	AHMADIPUR A，QIU T，SHEIKH B. Investigation of basal friction effects on impact force from a granular sliding mass to a rigid obstruction[J]. Landslides，2019，16 (6)：1 089-1 105.
[30]	阳友奎，原振华，杨涛. 柔性防护系统及其工程设计与应用[M]. 北京：科学出版社，2015：33-36.(YANG Youkui，YUAN Zhenghua，YANG Tao. Flexible protection system and its engineering design and Application[M]. Beijing：Science Press，2015：33-36.(in Chinese))
[7]	GOTTARDI G，GOVONI L. Full-scale modelling of falling rock protection barriers[J]. Rock Mechanics and Rock Engineering，2009，43(3)：261-274.
[16]	ASHWOOD W，HUNGR O. Estimating the total resisting force in a flexible barrier impacted by a granular avalanche using physical and numerical modeling[J]. Canadian Geotechnical Journal，2016，53(10)：1 700-1 717.
[26]	SHEN W G，ZHAO T，ZHAO J D，et al. Quantifying the impact of dry debris flow against a rigid barrier by DEM analyses[J]. Engineering Geology，2018，214(26)：86-96.
[17]	SONG D，NG C W W，CHOI C E，et al. Influence of debris flow solid fraction on rigid barrier impact[J]. Canadian Geotechnical Journal，2017，54 (10)：1 421-1 434.
[18]	SONG D，CHOI C E，NG C W W，et al. Geophysical flows impacting a flexible barrier：effects of solid-fluid interaction[J]. Landslides，2017，15(1)：99-110.
[25]	FERRERO A M，SEGALINI A，UMILI G. Experimental tests for the application of an analytical model for flexible debris flow barrier design[J]. Engineering Geology，2015，185：33-42.
[27]	SIYOU X，LIJUN S，YUANJUN J. et al. Experimental investigation on the impact force of the dry granular flow against a flexible barrier[J]. Landslides，2020，17：1 465-1 483.
[28]	KWAN J，CHEUNG R. Suggestion on design approaches for flexible debris-resisting barriers：Discussion Note DN1/2012[S]. Hong Kong，China：The Government of Hong Kong Standards and Testing Division，2012.