摘要
目前,随着我国社会经济的快速发展,对隧道工程的建设提出了较高的要求,在隧道施工建设过程中存在较多的环境和施工问题。通过有限元数值模拟软件建立模型,在原有15°接缝倾角的基础上设置0°、9°和18°作为三组工况,研究分析接缝倾斜角度对水工隧道衬砌管片受力的影响。研究结果表明,当接缝倾角为0°时,管片轴向位移变化均匀;当接缝倾角为9°和18°时,管片轴向位移变化不均匀,且接缝倾角越大,不均匀性尤为明显;衬砌管片的径向变形随着接缝倾角的增大,径向向外变形和向内变形最值均逐渐增大,当倾角为18°时,管片第一主应力最值远远超过混凝土的抗拉强度,发生局部拉裂破坏的可能性较大;管片环间接缝面纵向力随着与千斤顶距离的缩短而逐渐增大,而随着接缝倾角的增大,纵向力的衰减逐渐加快。通过上述研究,探究不同接缝倾斜角度对衬砌管片的影响,以期为衬砌隧道设计中管片接缝角度选择提供参考。
At present,with the rapid development of China's social economy,higher requirements are put forward for the construction of tunnel engineering.There are many environmental and construction problems in the process of tunnel construction.In this study,the finite element numerical simulation software was used to establish the model.Based on the original 15°joint inclination angle,0°,9°and 18°were set as three groups of working conditions to study and analyze the influence of joint inclination angle on the stress of hydraulic tunnel lining segment.The results show that when the joint angle is 0°,the axial displacement of the segment changes uniformly.When the joint angle is 9°and 18°,the axial displacement of the segment changes unevenly,and the greater the joint angle is,the more obvious the unevenness is.The radial deformation of lining segment increases with the increase of joint inclination angle,and the maximum values of radial outward deformation and inward deformation increase gradually.When the inclination angle is 18 degrees,the maximum value of the first principal stress of the segment is far more than the tensile strength of the concrete,and the possibility of local tensile cracking is greater.The longitudinal force of the joint surface between segment rings increases with the shortening of the distance from the jack,and the attenuation of the longitudinal force increases with the increase of the joint angle.Through the above research,this paper explores the influence of different joint inclination angles on lining segments,in order to provide reference for segment joint angle selection in lining tunnel design.
作者
刘登新
Liu Dengxin(Yangtze River Water Resources and Hydropower Development Group(Hubei)Co.,Ltd.,Wuhan 430010,Hubei)
出处
《陕西水利》
2022年第1期14-17,共4页
Shaanxi Water Resources
