摘要
华电灵武电厂向银川市智能化集中供热项目黄河穿跨越工程的河东侧盾构工作井埋深41.5 m,地下水位高;工作井为圆形结构,受力体系复杂,需对开洞工况下工作井结构进行分析与设计,以保证结构的安全性与经济性。基于此,文章针对中框架与底板之间的工作井结构,采用二维简化模式、简化梁单元模式与三维模式进行分析,结果表明:工作井开洞位置局部的情况类似拱形构件,随着暗柱等构造措施约束效果的增强,工作井开洞位置附近的受力和变形变小,但暗柱位置处负弯矩增加;设计时应通过设置暗柱、开洞位置内衬加厚的构造措施来改善结构的力学性能,并应合理选择暗柱的尺寸。
The buried depth of the shield working shaft on the east side of the Yellow River crossing project of the intelligent heating project from Huadian Lingwu power plant to Yinchuan city is 41.5 m, and the groundwater level is high. The working shaft is a circular structure with complex stress system. It is necessary to analyze and design the working shaft structure under the opening condition to ensure the safety and economy of the structure. Based on this, this paper analyzes the working shaft structure between the middle frame and the bottom plate by using two-dimensional simplified model, simplified beam element model and three-dimensional model. The results show that the local situation of the opening position of the working shaft is similar to the arch member. With the enhancement of the constraint effect of the structural measures such as the concealed column, the stress and deformation near the opening position of the working shaft become smaller, but the negative bending moment at the position of the concealed column increases. In the design, the mechanical properties of the structure should be improved by setting the concealed column and thickening the lining at the opening position,and the size of the concealed column should be reasonably selected.
作者
王明卓
WANG Mingzhuo(Shanghai Urban Construction Design and Research Institute(Group)Co.,Ltd.,Shanghai 200125,China)
出处
《工程技术研究》
2023年第3期173-175,共3页
Engineering and Technological Research
关键词
盾构隧道
工作井
结构设计
shield tunnel
working shaft
structural design
