摘要
研究目的:隧道变形监控量测是判断施工和支护安全性的重要手段,因而允许变形值的取值是隧道设计和施工中的一个关键技术参数。但目前支护参数设计以工程类比法为主,设计中难以针对某一具体支护参数给出对应的变形监测控制值,即使在现场根据监测值对支护参数进行动态调整,也无法直观地评价支护参数的合理性。本文基于总安全系数设计法提出现场监控量测控制值的计算方法与调整方法。研究结论:(1)施工中所监测的变形值实际上是支护结构的变形值,因此可以将支护结构的允许变形值作为现场监测的控制值;(2)提出了基于总安全系数设计法的支护结构允许变形值和极限变形值的计算方法,可以得出与设计安全系数相对应的变形监测控制值;(3)提出了现场变形监测值安全性的判别方法及支护参数与支护时机的现场调整方法;(4)本研究可以为隧道动态设计提供思路和方法。
Research purposes:Tunnel deformation monitoring and measurement is an important means to judge the safety of construction and support,so the allowable deformation value is a key technical parameter in tunnel design and construction.However,at present,the design of support parameters is mainly based on engineering analogy method.It is difficult to give the corresponding deformation monitoring control values for specific support parameters in the design.Even if the support parameters are dynamically adjusted according to the monitoring values in the field,the rationality of the support parameters can not be evaluated intuitively.Based on the total safety factor design method,this paper presents the calculation method of field measurement control value and adjustment scheme of construction measures.Research conclusions:(1)The deformation value monitored in construction is actually the deformation value of support structure,so the allowable deformation value of support structure can be used as the control value of field monitoring.(2)The calculation method of allowable deformation value and ultimate deformation value of support structure based on total safety factor design method is proposed.Besides,deformation monitoring control values corresponding to the design safety factor can be obtained.(3)The method of judging the safety of field deformation monitoring values and the method of adjusting support parameters and support timing are put forward.(4)The research results can provide ideas and methods for dynamic design of tunnels.
作者
肖明清
徐晨
XIAO Mingqing;XU Chen(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)
出处
《铁道工程学报》
EI
北大核心
2019年第12期48-52,70,共6页
Journal of Railway Engineering Society
基金
铁路隧道智能化建造设计技术研究(2019K042)
关键词
隧道允许变形值
总安全系数设计法
监控量测
极限变形值
动态设计
allowable deformation value of tunnel
total safety factor design method
in-situ monitoring and measurement
ultimate deformation value
dynamic design
