摘要
既有隧道上方挖方工程已成为目前最常见的近接工程之一。文章依托郑西高铁阌乡隧道上方连霍高速公路扩建的路基开挖工程,采用模型试验、现场监测方法,开展了上方挖方施工对既有隧道结构安全性影响的研究。经研究得:初始埋深足够大时,既有隧道会随上方挖方经历无影响、弱影响和强影响等阶段,在强影响区内位移随挖方呈近线性变化;相同围岩条件下,既有隧道支护刚度越大,受上方开挖时结构弯矩的变化越大;对既有隧道上方挖方近接施工进行了影响分区划分,依托工程的现场监测进行验证。研究成果可为类似近接工程提供借鉴。
Excavating above existing tunnel is one of the most common engineerings in approaching engineering. This paper is based on the roadbed excavation of Lian—Huo Expressway which is above Wenxiang Tunnel in Zheng—Xi highspeed railway. In the paper,we carry out a research about the safety state of the existing tunnel by model tests and true monitoring measurement. The results shows that when excavating above the tunnel,the existing tunnel will have stages from no impact to slightly-influence and strongly-influence with the large enough initial buried depth. In the stronglyinfluence zone,the change of structure structure displacement are closed to linear with the excavation. In the same conditions of the surrounding rock,when excavating above the tunnel,the greater the supporting stiffness,the greater change of the structural bending moment is. The influence area of the excavating above existing tunnel is divided. The testament of the area is based on the monitoring measurement. The research can provide reference for similar approaching engineering.
出处
《土木工程学报》
EI
CSCD
北大核心
2017年第S2期249-254,共6页
China Civil Engineering Journal
基金
国家重点研发计划(2017YFC0806000)
国家自然科学基金(51178399
51478392
U1434206)
关键词
既有隧道
挖方
强-弱影响区
埋深
支护刚度
existing tunnel
excavating
strongly and slightly influence areas
depth
supporting stiffness
