不同支护参数下大跨隧道变形特征对比研究  

Comparative Study on Deformation Characteristics of Large-span Tunnels under Different Support Parameters

作　　者：姜艳 JIANG Yan(Qingdao Liye Construction Consulting Co.,Ltd.,Qingdao 266000,China)

机构地区：[1]青岛利业建设咨询有限公司,青岛266000

出　　处：《价值工程》2023年第19期121-123,共3页Value Engineering

摘　　要：为探究不同支护参数下大跨隧道变形特征,采用FLAC3D数值模拟软件建立计算模型,研究不同支护参数对浅埋大跨隧道变形控制机制。通过分析不同预应力、不同支护密度下围岩塑性区分布、围岩变形情况,得出以下结论:①预应力数值是补偿支护的关键参数,隧道围岩塑性区基本消失,极大地改善了隧道整体的围岩应力状态。②预应力锚杆随支护密度增加,其围岩变形控制能力也逐渐增强,在一定范围内的增长趋势是近似线性增加。To investigate the deformation characteristics of large-span tunnel under different support parameters,FLAC3D numerical simulation software is used to establish a calculation model to study the deformation control mechanism of different support parameters on shallow buried large-span tunnel.By analyzing the distribution of plastic zone of surrounding rock and deformation of surrounding rock under different pre-stress and different support density,the following conclusions are drawn:①The value of pre-stress is the key parameter of compensation support,and the plastic zone of surrounding rock of the tunnel basically disappears,which greatly improves the overall stress state of surrounding rock of the tunnel.②The prestressing anchor increases with the support density,and its ability to control the surrounding rock deformation is gradually enhanced,and the growth trend in a certain range is an approximately linear increase.

关 键 词：浅埋大跨度隧道 数值模拟 支护参数 变形控制 

分 类 号：U452[建筑科学—桥梁与隧道工程]