摘要
针对公路隧道施工穿越粉质黏土地层时出现的沉降变形问题,分析了引起隧道沉降变形的原因,总结出了粉质黏土地层隧道沉降变形控制方法。以池州市汪家山隧道施工为背景,基于地表沉降、拱顶下沉、下台阶位移及周边位移等监测数据分析,总结了粉质黏土地层隧道结构受力和变形规律,对比分析了左、右线隧道采取的两种不同处治方案沉降变形控制效果。结果表明:粉质黏土地层隧道开挖时地表沉降与洞内沉降变形呈同步变化关系,同时采用基础注浆加固方案不仅有效地减小地表沉降和洞内变形,还可以缩短沉降变形稳定时间,且对隧道沉降变形控制效果比换填方案好。可为今后粉质黏土地层隧道的设计和施工提供参考。
Excessive settlement deformation problem in highway tunnel construction is frequently encountered when it passes through the silty clay soils.This paper evaluates potential factors that might induce the excessive deformations in the highway tunnel excavation in the silty clay soils.Deformation control measures are also summarized.The results of construction of Wangjiashan Tunnel in Chizhou are presented as a background.The monitoring data of ground subsidence,settlement at the crest as well as the side of the tunnel are compared and analyzed so that the stress and strain characteristics of the tunnel could be obtained.Based on the analytical information,different tunnel excavation induced settlement control measures could be implemented in both left and right tunnel excavations.The results show that there was a synchronous change relationship between the surface settlement and the settlement deformation during the tunnel excavation in silty clay soils;the foundation grouting reinforcement program could,not only rapidly and effectively reduce the surface settlement and the deformation in the tunnel,but also shorten the stability time of the settlement deformation.The control effect of the settlement deformation in the tunnel excavation is better than that of the filling replacement measure.
作者
张超
王飞
吴华
姜同虎
ZHANG Chao;WANG Fei;WU Hua;JIANG Tonghu(Anhui Transport Consulting&Design Institute Co.,Ltd.,Road Traffic Energy Saving and Environmental Protection Technology Transportation Industry R&D Center,Hefei 230088)
出处
《土工基础》
2021年第5期578-582,600,共6页
Soil Engineering and Foundation
关键词
粉质黏土地层
公路隧道
监控量测
沉降变形
silty clay soils
highway tunnel
monitoring and measurement
deformation
