摘要
主要对平底隧道和仰拱隧道二者的围岩受力和隧道周围位移进行对比分析,得到以下结论:开挖过程中两种隧道模型最大压应力值存在差别,且上台阶开挖要比下台阶开挖时最大压应力值要大;开挖过程中仰拱隧道的最大拉应力一直略小于平底隧道,说明施加仰拱对围岩整体受力较好;随着隧道开挖步的进行,两种隧道模型均呈现出拱顶沉降和拱底隆起位移增长的趋势,且仰拱隧道拱顶沉降值一直略大于平底隧道,而仰拱隧道拱底隆起值一直略小于平底隧道;两种隧道模型上拱墙竖向沉降基本一致,而仰拱隧道底部隆起位移均小于平底隧道,且仰拱隧道隆起位移最大值要比平底隧道小6. 78%,这与仰拱隧道底部围岩和衬砌的"拱作用"有关。实际工程中应综合考虑各方面进行方案选取。
This paper mainly compares the surrounding rock forces and the displacement around the tunnel between the flat-bottom tunnel and the inverted arch tunnel,and obtains the following conclusions:There are differences in the maximum compressive stress values of the two tunnel models during excavation,and the upper step excavation is better than The maximum compressive stress value of the lower step excavation is large;the maximum tensile stress of the inverted arch tunnel during the excavation process is always slightly smaller than that of the flat bottom tunnel,indicating that the application of the inverting arch to the surrounding rock is better,as the tunnel excavation step proceeds.Both tunnel models show a tendency of arch settlement and arch bottom ridge displacement growth,and the settlement value of the arch of the inverted arch tunnel is always slightly larger than that of the flat bottom tunnel,while the value of the arch bottom of the inverted arch tunnel has been slightly smaller than that of the flat bottom tunnel;The vertical settlement of the arch wall on the tunnel model is basically the same,and the uplift displacement of the bottom of the inverted arch tunnel is smaller than that of the flat bottom tunnel,and the maximum displacement of the inverted arch tunnel is 6.78%smaller than that of the flat tunnel.This is related to the surrounding rock and lining of the bottom of the inverted arch tunnel."Arch effect"is related.In the actual project,the analysis of various aspects should be considered comprehensively.
作者
彭玉麒
PENG Yuqi(Chongqing Nanan District Municipal Facilities Management Office,Chongqing 400060,China)
出处
《公路工程》
北大核心
2018年第5期284-288,共5页
Highway Engineering
关键词
隧道工程
结构形式
围岩应力
位移
tunnel engineering
structural form
surrounding rock stress
displacement
作者简介
彭玉麒(1963-),女,湖南长沙人,副教授,研究方向:市政工程。
