| 节理倾角对软岩隧道掌子面变形及失稳模式的影响 |
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| 引用本文： | 周君,周洋,陈林,张卓英.节理倾角对软岩隧道掌子面变形及失稳模式的影响[J].路基工程,2022,0(6):196-200. |
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| 作者姓名： | 周君 周洋 陈林 张卓英 |
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| 作者单位： | 中交第二航务工程有限公司第五工程分公司，武汉 430014 |
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| 摘 要： | 依托玉磨铁路西双版纳隧道工程，运用有限元软件ABAQUS，研究不同节理倾角下掌子面变形和失稳模式。结果表明:掌子面最大挤出变形以90°为中心呈“M”型分布，倾角为60°或120°时掌子面挤出变形最大；最不利节理角度影响下，隧道开挖对掌子面前方岩体的最大影响范围约为1倍洞径；隧道穿越节理岩体且不加以控制或控制不当时，随节理倾角变化，掌子面失稳模式有圆弧型、三角型和倒三角型；随节理面倾角增大，掌子面变形从弹性变形向塑性变形发展，当倾角为30°时，掌子面岩体由弹性变形转变为塑性变形。
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| 关 键 词： | 隧道 节理岩体 围岩变形 节理倾角 掌子面失稳 |
| 收稿时间： | 2022-08-11 |
Influence of Joint Dip Angle on Deformation and Instability Mode of Soft Rock Tunnel Face |
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| Abstract: | Based on the Xishuangbanna tunnel project of Yumo railway, by using finite element software ABAQUS, the deformation and instability modes of tunnel face under different joint dip angles are studied. The result shows that the maximum extrusion deformation of the face was “M” distribution with 90° as the center, and the extrusion deformation of the face was the largest when the dip angles were 60° or 120°. Under the influence of the most unfavorable joint angle, the maximum influence range of tunnel excavation on the rock mass ahead of the tunnel face is about 1 times of the hole diameter. When the tunnel passes through the jointed rock mass and is not controlled or controlled improperly, with the change of joint dip angle, the instability modes of the tunnel face are arc type, triangle type and inverted triangle type. With the increase of joint plane dip angle, the deformation of working face develops from elastic deformation to plastic deformation. When the dip angle is 30°, the rock mass of working face changes from elastic deformation to plastic deformation. |
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