地表倾角和埋深对浅埋偏压隧道塑性区的影响范围研究
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摘要
浅埋偏压隧道施工安全是隧道施工的常见问题.采用FLAC3D有限差分软件,针对地表倾角和埋深对隧道塑性区范围的影响,分为两组不同工况的隧道开挖进行了数值分析.结果表明:随着地表倾角增加,左边墙和左拱脚的水平位移逐渐减小,当地表倾角为35°时位移值为负,出现了向左的位移,右拱腰的竖向位移增大趋势要大于左拱腰,随着隧道埋深的增加,位移的大小随埋深的增大均逐渐增加;剪应力主要集中在左右拱脚和左右边墙处,塑性区首先出现在这些区域,并随着剪应力的增加范围逐渐增大.
Construction safety of shallow tunnel with unsymmetrical loadings is an important problem in tunnel construction.The paper use FLAC3 Dto analyse ten different conditions of tunneling for surface dip and buried depth of the tunnel and the plastic zone impact.The result show:With the increasing of the surface dip,the horizontal displacement of the left wall and the left arch reduce gradually,and when the surface dip was 35 degree,the horizontal displacement is negative;The increasing trend of the vertical displacement of Right hance is greater than left hance;With the increasing of tunnel depth,the displacement increase gradually;Sheer stress is mainly concentrated around the left and right arch and the left and right wall,and plastic zone first appears in these area and its scope enlarge with the increasing of sheer stress.
Construction safety of shallow tunnel with unsymmetrical loadings is an important problem in tunnel construction.The paper use FLAC3 Dto analyse ten different conditions of tunneling for surface dip and buried depth of the tunnel and the plastic zone impact.The result show:With the increasing of the surface dip,the horizontal displacement of the left wall and the left arch reduce gradually,and when the surface dip was 35 degree,the horizontal displacement is negative;The increasing trend of the vertical displacement of Right hance is greater than left hance;With the increasing of tunnel depth,the displacement increase gradually;Sheer stress is mainly concentrated around the left and right arch and the left and right wall,and plastic zone first appears in these area and its scope enlarge with the increasing of sheer stress.
引文
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[2]钟新樵.土质偏压隧道衬砌模型试验分析[J].西南交通大学学报,1996,31(6):602~606
[3]周晓军,高杨,李泽龙,杨昌宇.地质顺层偏压隧道围岩压力及其分布特点的试验研究[J].现代隧道技术,2006,43(1):12~21
[4]谢世平.偏压隧道稳定性分析及控制研究[D].重庆:重庆大学,2007
[5]沈春儒,蒋斌松.桦木沟隧道围岩偏压稳定性研究[J].公路交通科技,2011,000(009):164~166
[6]朱劲,徐幼建,许瑞宁.不同节理倾角对红层地区偏压隧道围岩稳定性的影响[J].四川建筑,2015,35(2):91~93
[7]乔雄,陈建勋,王梦恕.黄土公路隧道洞口段变形规律测试研究[J].岩石力学与工程学报,2013,32(z2):3552~3556
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