New simple method for measuring impact force on a flexible barrier from rockfall and debris flow based on large-scale flume tests

Tan，Dao Yuan1; Yin，Jian Hua1; Feng，Wei Qiang2; Qin，Jie Qiong1; Zhu，Zhuo Hui1

2020-12-20

10.1016/j.enggeo.2020.105881

ENGINEERING GEOLOGY   影响因子和分区

0013-7952

1872-6917

Accurate determination of impact loads is of great necessity for safe and economical design of flexible barriers. Nevertheless, measurement of the impact force on a flexible barrier is still an open problem due to the highly deformable flexible net under impact and stress concentration on force transducers. In this study, large-scale flume tests with new design of instrumentation were adopted to validate and optimise existing methods for measuring the impact forces on a flexible barrier. Specifically, single-boulder impact tests were conducted to verify the accuracy of those methods. A debris flow impact test was performed to quantitatively investigate the dynamic behaviour of a flexible barrier under the impact of a debris flow. Thanks to the well-designed instrumentation, the impact force distribution characteristics of a debris flow on a flexible barrier are discovered. During the interaction process, the debris flow first impacted on the bottom area of the flexible net, then the dynamic impact moved up with gradual deposition of debris material. It is found that the impact pressure on the central area of the net is much larger than that on two sides. Therefore, triangular-shaped load distribution is used to optimise the existing methods for measuring the impact force induced by a debris flow. Attributable to the good accuracy and simple instrumentation requirement, a new simple method can be generalized for real-time monitoring of impacts on flexible barriers installed in natural terrains

Debris flow Impact force measurement Large-scale flume test Rockfall

SCI ; EI

英语

其他

Collaborative Research Fund from Research Grants Council (RGC) of Hong Kong Special Administrative Region Government (HKSARG) of China[PolyU 12/CRF/13E] ; Research Impact Fund from Research Grants Council (RGC) of Hong Kong Special Administrative Region Government (HKSARG) of China[R5037-18] ; General Research Fund from Research Grants Council (RGC) of Hong Kong Special Administrative Region Government (HKSARG) of China["PolyU 152796/16E","PolyU 152209/17E","PolyU 152130/19E"]

Engineering ; Geology

Engineering, Geological ; Geosciences, Multidisciplinary

WOS:000597310200022

ELSEVIER

20204509466877

Debris

Mine and Quarry Operations:502.1 ; Accidents and Accident Prevention:914.1

GEOSCIENCES

2-s2.0-85095420172

Scopus

1.Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Kowloon,Hung Hom,Hong Kong
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Tan，Dao Yuan,Yin，Jian Hua,Feng，Wei Qiang,et al. New simple method for measuring impact force on a flexible barrier from rockfall and debris flow based on large-scale flume tests[J]. ENGINEERING GEOLOGY,2020,279.

Tan，Dao Yuan,Yin，Jian Hua,Feng，Wei Qiang,Qin，Jie Qiong,&Zhu，Zhuo Hui.(2020).New simple method for measuring impact force on a flexible barrier from rockfall and debris flow based on large-scale flume tests.ENGINEERING GEOLOGY,279.

Tan，Dao Yuan,et al."New simple method for measuring impact force on a flexible barrier from rockfall and debris flow based on large-scale flume tests".ENGINEERING GEOLOGY 279(2020).