摘要
以某引水工程项目典型输水隧洞断面为研究对象,采用正交试验法,建立开挖进尺、钢拱架间距、初衬厚度为影响因素的9种工况,并使用有限元软件对其进行数值模拟。通过极差法分析,得出开挖进尺、钢拱架间距、初衬厚度因素对安全指标、经济指标影响的主次顺序。最后评价得到输水隧洞最优支护参数。结果表明:初衬拱顶应力主要由钢拱架间距、初衬厚度、开挖进尺影响。拱顶下层位移主要由开挖进尺、钢拱架间、距初衬厚度影响。优化后输水隧洞施工支护参数为:初衬厚度16 cm、钢拱架间距0.60 m、开挖进尺1.50 m。
Taking the cross-section of a typical water diversion tunnel as the research object, the orthogonal test method is adopted to establish nine working conditions, which are the influencing factors of excavation length, steel arch spacing and initial lining thickness,and the finite element software is used to carry out numerical simulation. Through the analysis of range method, the main order of the influence of excavation length, steel arch spacing and initial lining thickness on safety and economic indexes is obtained. Finally, the optimal supporting parameters of water tunnel are evaluated. The results show that the stress of initial lining vault is mainly affected by the space between steel arch frames, the thickness of the initial lining and the excavation footage. The displacement of the lower layer of the vault is mainly influenced by the thickness of the excavation footage, the thickness between steel arch frames and the distance from the primary lining. The optimized construction support parameters of the water conveyance tunnel are as follows: the initial lining thickness is 16cm, the steel arch frame spacing is 0.6m, and the excavation footage is 1.5m.
作者
赵玉龙
ZHAO Yulong(Guazhou Yulin River Irrigation District Water Conservancy Service Institute,Jiuquan 736115,China)
出处
《河南水利与南水北调》
2022年第5期75-76,101,共3页
Henan Water Resources & South-to-North Water Diversion
关键词
输水隧洞
隧洞施工
正交试验
极差法
支护参数
water conveyance tunnel
tunnel construction
orthogonal test
range method
support parameters