渗流耦合作用下的输水隧洞稳定性数值研究

Numerical study on the stability of water conveyance tunnel under seepage coupling

为研究长距离深埋输水隧洞在渗流耦合作用下混凝土衬砌管片的稳定特性,建立有限元模型使用流体计算软件Star-CCM+进行数值模拟,分别对衬砌管片的变形、应力分布和轴力弯矩进行分析。得出以下结论:衬砌混凝土管片周围的变形和应力分布均呈现关于中间轴左右对称分布;考虑渗流耦合作用时衬砌管片的最大径向位移底部移动到顶端,大小由1.932 mm增加到3.108 mm;第一主应力最大值出现在管壁底部外侧,第三主应力最大值出现在管壁内侧;弯矩最大值为82.59 kN/m,该结论可为实际工程建设提供理论指导。

In order to study the stability characteristics of long distance deep buried water tunnel under the coupling effect of seepage,the finite element model was established and the fluid calculation software star-ccm+was used for numerical simulation,and the deformation,stress distribution and axial force bending moment of the lining were analyzed respectively.The following conclusions are drawn:the distribution of deformation and stress around the lining concrete segments is symmetrical about the middle axis.When considering the coupling effect of seepage,the maximum radial displacement of the lining piece moves from the bottom to the top,and the size increases from 1.932mm to 3.108mm.The maximum value of the first principal stress appears at the bottom and outside of the tube wall,and the maximum value of the third principal stress appears inside of the tube wall.The maximum bending moment is 82.59kN?m,which can provide reference for actual engineering construction.