隧道开挖对沟谷坡体变形影响及衬砌结构力学特性分析
摘要:某公路隧道洞口穿越黄土沟谷,受沟谷地形影响,该隧道为典型的偏压双孔隧道。基于沟谷地形地貌、隧道分布情况、黄土地层及隧道结构物理力学参数建立有限元数值计算模型,采用强度折减法分析左洞(埋深大)先行方案与右洞(埋深小)先行方案对沟谷坡体稳定性的影响,进一步研究不同施工方案下隧道衬砌结构受力特性。研究结果表明,左洞开挖对坡体滑动面及塑性区影响较大,并对坡脚位移的影响程度最大;隧道开挖先行洞的衬砌结构受力较大,左洞先行方案对衬砌影响程度大于右洞先行方案,但左洞先行方案对坡体稳定性有利。据此,建议该偏压隧道采用左洞(埋深大)先行方案,以减小隧道开挖对坡体的扰动,同时根据衬砌结构内侧受力薄弱点分布规律加强左、右洞衬砌设计。
Abstract:Based on the topography of the loess tunnel entrance through the valley, the finite element numerical calculation model was established, and the strength reduction method was used to analyze the influence of the left tunnel and the right tunnel on the stability of the valley slope, and the mechanical characteristics of tunnel lining structures under different construction schemes were further studied. The research results show that in the two construction schemes, the left tunnel excavation has a greater impact on the sliding surface and plastic zone of the slope, and has the greatest impact on the displacement of the slope toe. In addition, the tunnel excavation makes the lining structure of the leading hole more stressed, and the left tunnel excavation has a greater impact on the lining than the right tunnel excavation, but the left tunnel excavation is beneficial to the slope stability. Therefore, left tunnel excavation should be adopted in this type of unsymmetrial loading tunnel to reduce the disturbance to the slope by the tunnel excavation. At the same time, the design of the left and right tunnel lining should be strengthen according to the distribution pattern of the weak points on the inner side of the lining structure.
中文标题:
隧道开挖对沟谷坡体变形影响及衬砌结构力学特性分析
Influence of Tunnel Excavation on Valley Slope Deformation and Mechanical Characteristics of Lining Structure
作者:
杨治军1,,刘泾堂1,胡金鑫1,洪铭2
Yang Zhijun1,,Liu Jingtang1,Hu Jinxin1,Hong Ming2
作者简介:杨治军,男,1993年生,汉族,甘肃白银人,硕士,助理工程师,主要从事隧道工程设计工作。E-mail:yzj43256@136.com
通讯地址:
1.甘肃省交通规划勘察设计院股份有限公司,甘肃兰州 730030 2.长安大学公路学院,陕西西安 710064
1.GansuProvinceTransportationPlanning,Survey&DesignInstituteCo.,Ltd.,Lanzhou730030,Gansu,China 2.SchoolofHighway,Chang’anUniversity,Xi’an710064,Shaanxi,China
中图分类号:U 451; U 459.4
doi:10.3969/j.issn.1007-2993.2023.03.012
出版物:岩土工程技术
收稿日期:2022-04-06
网络出版日期:2023-08-08
刊出日期:2023-06-08
关键词:隧道穿越沟谷,数值模拟,强度折减法,施工顺序,优化设计
Key words:tunnel crossing valley,numerical simulation,strength reduction method,construction sequence,optimized design
文档包含图片数量:图片(19)张
文档包含表格数量:表格(2)个
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