摘要
依托连霍高速公路改扩建工程,基于强度折减法,研究不同初始埋深下隧道上方填挖方时的影响分区,并结合实际工程进行了验证分析。结果表明:随着初始埋深的增加,填挖方时隧道的安全系数整体呈减小的趋势,埋深较浅时隧道的安全系数受初始埋深的影响较大,随着埋深增加,受初始埋深的影响越来越小,且每次填方高度对隧道结构也有一定影响,当填方高度不大于10m、初始埋深大于40m时,可认为填方时初始埋深对隧道结构无影响,当埋深大于80m时可认为填方高度对隧道结构无影响;当挖方高度不大于10m、初始埋深大于50m时,可认为挖方时初始埋深对隧道结构无影响。通过现场实测数据的分析,阌乡隧道和函谷关隧道受上方施工影响断面的水平收敛、轨道沉降和结构应力变化数据都远小于规定允许值,可认为无影响,同时验证了影响分区的合理性,对类似工程具有一定的指导意义。
Relying on high-speed Lianhuo through special Wenxiang Zhengxi passenger tunnel rural expansion project,based on the strength reduction method,the influence of the excavation at the top of the tunnel under different initial burial depth is studied,and the verification is carried out with the actual engineering. The results show: with the increase of the initial burial depth,the safety factor of the tunnels is decreasing as a whole. When the depth is shallow,the safety factor of the tunnel is greatly affected by the initial depth. With the increase of the buried depth,the influence of the initial burial depth is getting smaller and smaller,when the filling height is not more than 10 m and the initial burial depth is more than 40 m,it can be considered that the initial burial depth has no effect on the tunnel structure.When the depth is more than 80 m,the filling height can be considered to have no effect on the tunnel structure. When the excavation height is not more than 10 m and the initial burial depth is more than 50 m,it can be considered that the initial burial depth has no effect on the tunnel structure. Through the analysis of field test data,the horizontal convergence,orbital settlement and structural stress data of the tunnel affected by the construction of the tunnel and the tunnel are far less than the stipulated allowable value. It can be considered that the construction has no effect on the tunnel. At the same time,it proves the rationality of influence division,it has a guiding significance for similar projects.
出处
《土木工程学报》
EI
CSCD
北大核心
2017年第S1期8-13,共6页
China Civil Engineering Journal
基金
国家自然科学基金(51678497
51678495)
关键词
强度折减法
安全系数
近接施工
影响分区
initial burial depth
strength reduction method
safety factor
adjacent construction
influence division
