Comparative Study on Deformation Characteristics of Large-span Tunnels under Different Support Parameters
姜艳JIANG Yan
（青岛利业建设咨询有限公司,青岛266000 )
( Qingdao Liye Construction Consulting Co.,Ltd. , Qingdao 266000,China )
摘要:为探究不同支护参数下大跨隧道变形特征,采用FLAC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。
Abstract: To investigate the deformation characteristics of large-span tunnel under different support parameters，FLAC”numericalsimulation software is used to establish a calculation model to stuly the deformation control mechanism of different support parameters onshallow buried large-span tunnel. By analyzing the distribution of plastic zone of suroundling rock and deformation of surounding rockunder different pre-stress and different support density, the following conclusions are drawn:①The value of pre-stress is the key parameterof compensation support, and the plastic zone of surounding rnock of the tunnel basically disappears, which greatly inmproves the overallstress state of surrounding rock of the tunnel.②The prestressing anchor increases with the support density, and its abiliy to contml thesurroundig 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
Key words: shallow buried large span tunnel; numerical simulation; support parameters; deformation control
价值工程-文章出处：姜艳.不同支护参数下大跨隧道变形特征对比研究[J].价值工程,2023,42(19):121-123. |
