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作 者:孙海明 SUN Haiming(Yantai Longkou Highway Construction and Maintenance Center,Yantai Shandong 265701,China)
机构地区:[1]烟台市龙口公路建设养护中心,山东烟台265701
出 处:《交通节能与环保》2024年第3期230-233,共4页Transport Energy Conservation & Environmental Protection
摘 要:为探究下穿公路浅埋隧道开挖过程中的围岩稳定性与支护结构效能,本文采用三维数值模拟软件进行有无支护工况对比研究。主要结果如下:(1)在无支护条件下,双洞开挖完全时公路地表的变形由2.34mm增大为3.7mm,右洞的开挖对左洞的水平位移变形量影响较小,但对左洞左拱脚处塑性区变形量影响较大;(2)在有支护条件下,双洞开挖完全时公路地表的变形由0.73mm增大为1.3mm,支护设计下隧道开挖扰动对公路的影响降低了一个数量级,有效地控制了地表的沉降。In order to explore the stability of the surrounding rock and the efficiency of the supporting structure during the excavation of the highway through the tunnel,this paper uses the three-dimensional numerical simulation software to carry out a comparative study of the working conditions with or without support.The main results are as follows:(1)under the condition of no support,the deformation of the surface road increases from 2.34mm to 3.7mm when the excavation of the double hole is complete,and the excavation of the right hole has little influence on the horizontal displacement deformation of the left hole,but the plastic zone at the foot of the left arch of the left hole changes significantly;(2)under the condition of support,the deformation of the surface road increases from 0.73mm to 1.3mm when the excavation of the double hole is complete,and the influence of tunnel excavation disturbance on the road is reduced by an order of magnitude under the support design,which effectively controls the settlement of the surface.
关 键 词:公路工程 隧道下穿 初期支护 数值模拟 支护控制
分 类 号:U455[建筑科学—桥梁与隧道工程]
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