Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (6): 1773-1781.doi: 10.13229/j.cnki.jdxbgxb.20230069

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Toughness analysis and improvement of road structure under action of debris flow

Zhi-jia XUE1(),Zhao-yang WANG1,Jiu-peng ZHANG1(),Chang-gen YAN1,Zi-kai XU1,Ying-li ZHANG1,Xiao-ming Huang2,Tao Ma2   

  1. 1.School of Highway，Chang'an University，Xi'an 710064，China
    2.School of Transportation，Southeast University，Nanjing 211189，China
  • Received:2023-01-28 Online:2023-06-01 Published:2023-07-23
  • Contact: Jiu-peng ZHANG E-mail:xuegeneral@126.com;zhjiupeng@chd.edu.cn

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Abstract:

Due to the deficiency of the study on the resilience of road structure， the response function of road structure performance under the impact and siltation of debris flow was proposed. And the response function was solved by analyzing the characteristics of debris flow protection and toughness of road structure. Furthermore， the cumulative loss degree of road structure performance after debris flow is used to characterize the safety toughness， and a theoretical model of road structure safety toughness is established. Taking Shuiyugou debris flow in Shawan Town， Gansu Province as an example， the toughness curve and safety toughness of road structure at 394 km+800 m of Shuiyugou National Road was analyzed. The results show that the safety toughness value of road structure is only 63.92% when no measures are taken. After taking the emergency treatment， the safety toughness value of road structure increased to 81.98%. After taking measures to resist debris flow， the ability of road structure to deal with disasters further increased to 85.76%， which significantly improved the toughness. The results quantified the resistance and resilience of road structure under the impact and siltation of debris flow and provided a decision basis for improving the toughness of road structure under the impact and siltation of debris flow.

Key words: engineering of communications and transportation system, road structure, toughness improvement, debris flow, defensive measures

CLC Number: 

  • U491

Fig.1

Comprehensive treatment scheme focusing on "Stability""

Fig.2

Comprehensive treatment scheme focusing on "Barrier""

Fig.3

Comprehensive treatment scheme focusing on "Drainage""

Fig.4

Toughness curve of road structure"

Table 1

Toughness component of Shuiyugou National Road 394 km+800 m"

时间/min韧性分量数值
t0=0惯性分量R01.1×107
t1=90抵抗韧性R1583.504
t2=9000恢复韧性R20.033

Fig.5

Toughness curve and safety toughness at 394 km +800 m of Shuiyugou National Road"

Table 2

Toughness component at 394 km+800 m of Shuiyugou National Road after emergency treatment"

时间/min韧性分量数值
t0=0惯性分量R01.1×107
t1=90抵抗韧性R1583.504
t2=4410恢复韧性R21.396

Fig.6

Toughness curve at 394 km+800 m of Shuiyugou National Road after taking emergency response measures"

Fig.7

Safety toughness at 394 km+800 m of Shuiyugou National Road under three different conditions"

Fig.8

Comparison of toughness curve between taking emergency response measures and taking mitigation measures during disaster"

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