地形偏压对公路隧道偏压程度影响模型试验研究  

Model Experimental Investigation on the Effect of Terrain Bias on Highway Tunnel Bias Degree

作　　者：代树林[1] 杨有源 辛毓龙 左天宇 DAI Shu-lin;YANG You-yuan;XIN Yu-long;ZUO Tian-yu(Construction Engineering College of Jilin University, Changchun 130026, China;Qindao Geological Prospecting & Research Institute, Qingdao 266000, China)

机构地区：[1]吉林大学建设工程学院,长春130026 [2]青岛市勘察测绘研究院,青岛266000

出　　处：《科学技术与工程》2022年第7期2901-2906,共6页Science Technology and Engineering

基　　金：吉林省交通厅科技项目(2014-4-1-10-2)。

摘　　要：为研究地形偏压对公路隧道偏压程度影响,以鹤大高速回头沟隧道为依托工程,采用铁砂、汉白玉等材料,按照几何相似比1∶80,容重相似比1∶1制作隧道模型,结合现场试验验证模型试验的合理性,研究不同埋深、地表坡度对公路隧道偏压程度影响。试验表明:①随着埋深的增大,隧道偏压程度不断减小,当埋深达到35 m以上,偏压程度变化较小,多为轻微甚至可忽略偏压,对隧道影响较小;②随着坡度的增大,隧道偏压程度不断增大,当坡度小于10°时,多为可忽略偏压,坡度大于25°且埋深小于10 m时大多为严重偏压状态,易影响隧道稳定性;③根据不同埋深、地表坡度拱脚偏压系数变化规律并结合实际工程偏压程度,得到Ⅴ级围岩公路隧道偏压程度判定表,为公路偏压隧道偏压程度判定提供参考。To study the influence of terrain bias on the highway tunnels bias degree,the iron sand,white marble and other materials according to the similarity ratio of 1∶80 in geometry but 1∶1 in bulk density were used to make a tunnel model based on Huitougou Tunnel of Heda Expressway.Nextly,the variation law of tunnel bias degree under different surface slopes and buried depths was analyzed after the model rationality was verified through field test.Finally,the following results are found.The tunnels bias degree is negatively correlated with buried depth.However,when the thickness of overlying surrounding rock reaches more than 35 m,it changes little and most of them present as slight or even negligible bias,which causes little harm to the tunnel.The difference is that the tunnel bias degree is positively related to the slope.When the surface slope is less than 10°,the bias degree is mostly negligible.What needs attention is the tunnel is mostly in a severe bias state when the surface slope is more than 25°and the buried depth is less than 10 m,which poses a threat to the tunnel stability;According to the arch foot bias coefficient variation law of different buried depths and surface slopes,and combined with the actual engineering bias degree,the judgment table for the bias degree of grade V surrounding rock highway tunnels is obtained,which provides a reference for the judgment of highway tunnel bias degree.

关 键 词：公路隧道 偏压程度 模型试验 现场监测 

分 类 号：U452[建筑科学—桥梁与隧道工程]