输水隧洞竖井马头门衬砌结构有限元分析

Finite Element Analysis of the Lining Structure of the Ingate of the Vertical Shaft of the Water Conveyance Tunnel

基于有限元分析法对输水隧洞竖井马头门开展设计研究,结合工程的实际特点以及使用功能和建设条件等要求,对隧洞的衬砌等进行了综合设计。通过有限元分析软件Midas GTS NX,创建隧洞竖井马头门空间三维分析模型,对隧洞马头门衬砌结构在不同工况荷载作用下的受力情况进行重点分析,得到结构变形及内力分布的规律。分析结果显示,隧洞主支洞交叉口连接处拱顶和侧墙变形量较大,内力最大值位于底板与侧墙连接处。施工时,可利用固结灌浆提升围岩自稳性,加密钢拱架提高一次支护强度,加强侧墙与底板连接处局部配筋,从而达到结构设计优化的目的。

Based on the finite element analysis method,the design and research of the ingate of the water conveyance tunnel shaft are carried out.Combined with the actual characteristics of the project,the use function and construction conditions,the lining of the tunnel is comprehensively designed.Through the finite element analysis software MIDAS GTS NX,the three-dimensional analysis model of the ingate of the tunnel shaft is created.The stress of the tunnel ingate lining structure under different working conditions is analyzed,and the laws of structural deformation and internal force distribution are obtained.The analysis results show that the deformation of the vault and side wall at the intersection of the main adit of the tunnel is large,and the maximum internal force is located at the connection between the bottom plate and the side wall.During construction,consolidation grouting can be used to improve the self stability of surrounding rock,densify steel arch,improve the primary support strength,and strengthen the local reinforcement at the connection between side wall and bottom plate,so as to achieve the purpose of structural design optimization.