对《公路隧道设计细则》(JTG D70—2010)落石冲击力计算部分条文的修改意见  

Suggestions on Revision of the Provisions for Calculating the Impact Force of Rockfall in Guidelines for Design of Highway Tunnel(JTG D70-2010)

作　　者：黎良仆 袁松 廖沛源[1] 王希宝 LI Liangpu;YUAN Song;LIAO Peiyuan;WANG Xibao(Sichuan Communication Surveying&Design Institute Co.,Ltd.,Chengdu 610031;Southwest Jiaotong University,Chengdu 610031)

机构地区：[1]四川省交通勘察设计研究院有限公司,成都610031 [2]西南交通大学,成都610031

出　　处：《现代隧道技术》2023年第3期65-73,共9页Modern Tunnelling Technology

基　　金：交通运输行业重点科技项目(2020-MS3-101);四川省交通运输科技项目(2020-B-01).

摘　　要：落石冲击力由于其研究难度大,一直是业内难以解决的难题。现行《公路隧道设计细则》(JTG D70—2010)中对落石冲击力计算的规定存在一些问题,没有得到及时发现与修正,国内众多学者和设计人员认为其计算结果严重失真,致使细则指导意义不强。鉴于此,针对落石冲击结构物接触力与响应力的区别,落石冲击荷载作用范围、结构计算长度、最不利设防对象等细则没有明确规定的问题进行分析与探讨,并提出相应修改意见,建议在下一版细则修订时,使其更加完善,从而更好地用来指导明洞与棚洞结构计算与设计。The impact force of rockfall,as the main accidental load,must be considered in the design for the open cut tunnel section and the open cut tunnel and shed tunnel sections specifically designed to prevent high-level collapse and rockfall.Due to the high research difficulty and complexity,the impact force of rockfall has always been a difficult problem to be solved in the industry,which determines that the current design of open cut tunnels and shed tunnels still relies mainly on experience analogy,supplemented by structural calculation and analysis.There are some problems in the current Guidelines for Design of Highway Tunnel(JTG D70-2010)that have not been discovered and corrected in a timely manner for the calculation of impact force of rockfall.This has led many scholars and designers in China to believe that the calculation results are severely distorted,resulting in small guiding significance of the Guidelines.In this paper,the abovementioned problems are corrected.Meanwhile,the issues not clearly specified in the Guidelines are analyzed and discussed,such as the difference between the contact force and the response force while the rockfall impacting the structure,the scope of action of the rockfall impact load,the effective length of the structure and the most unfavorable fortification object,and the corresponding modification suggestions are proposed.It is suggested that when the Guidelines is revised in the next edition,it should be more perfect,so as to better guide the calculation and design of the open cut tunnel and shed tunnel structures.

关 键 词：公路隧道 明洞 棚洞 落石冲击力 响应力 设防对象 

分 类 号：U452[建筑科学—桥梁与隧道工程]