摘要
针对内水压力对盾构隧洞复合衬砌结构力学特性的影响,结合滇中引水工程龙泉倒虹吸隧洞,对复合衬砌壳-弹簧模型进行改进,对内水压作用下双层衬砌结构力学行为进行分析。结果表明,管片结构弯矩受内水压力影响较小,而管片轴力及纵向接头抗弯刚度随内水压力增加而减小;二次衬砌轴力及弯矩受内水压力影响较大;内水压力对弯矩较大处接头抗弯刚度有较大影响,接头抗弯刚度最大减小47.97%;外部水土荷载作用下管片变形呈现竖向收敛、水平扩张趋势,充水后衬砌结构整体向下位移,竖向进一步收敛;内水压力作用下,管片与二次衬砌间以径向受压作用为主,当管片纵向接头受正弯矩作用时,压应力显著增加,受负弯矩作用时,径向相互作用力为零,层间存在分离趋势。
In view of the influence of internal water pressure on the mechanical characteristics of the composite lining structure of the shield tunnel,and in combination with the Longquan Inverted Siphon Tunnel of the Central Yunnan Water Diversion Project,the shell-spring model of the composite lining is improved,and the mechanical behaviors of the double-layer lining structure under the internal water pressure are analyzed.The results show that the bending moment of the segment structure is less affected by internal water pressure,while the axial force of the segment and the flexural rigidity of the longitudinal joint decrease with the increase of internal water pressure;The axial force and the bending moment of the secondary lining are greatly affected by internal water pressure;The internal water pressure has a significant effect on the flexural rigidity of the joint with a larger bending moment,with a maximum decrease of 47.97%in the flexural rigidity of the joint;Under external soil and water loads,the deformation of the segment shows a trend of vertical convergence and horizontal expansion.After filled with water,the overall downward displacement of the lining structure leads to its further vertical convergence.Under the action of internal water pressure,the force between the segment lining and the secondary lining is mainly radial compression.When the longitudinal joint of the segment is subjected to a positive bending moment,the compressive stress significantly increases.When subjected to a negative bending moment,the radial interaction force is zero,and there is a separation trend between layers.
作者
孟庆辉
封坤
杨国栋
何骁
杨兆
黄青富
高崇
MENG Qinghui;FENG Kun;YANG Guodong;HE Xiao;YANG Zhao;HUANG Qingfu;GAO Chong(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031;Yunnan Province Central Yunnan Water Diversion Engineering Co.,Ltd.,Kunming 650000;Powerchina Kunming Engineering Corporation Limited,Kunming 650041;China Railway 19th Bureau Group Rail Transit Engineering Co.Ltd.,Beijing 101300)
出处
《现代隧道技术》
CSCD
北大核心
2023年第4期33-42,共10页
Modern Tunnelling Technology
基金
云南省重大科技专项计划(202002AF080003).
关键词
输水盾构隧洞
双层衬砌
内水压力
接头刚度
受力特征
Water conveyance shield tunnel
Double-layer lining
Internal water pressure
Joint stiffness
Mechanical characteristics
