水工隧洞支护特性研究

Research on Support Characteristic of Hydraulic Tunnel

以某水工隧洞为工程背景,采用D-P屈服准则,考虑了水应力的影响范围,利用ANSYS软件进行了水工隧洞三维弹塑性有限元计算分析.分别研究了衬砌支护材料的选择对隧洞稳定性的影响、开挖过程和应力旋转对支护时机选择的影响.计算结果表明:随着衬砌支护材料弹性模量的提高,隧洞顶部和底部分别有上弹和下沉的趋势,隧洞的稳定性有所提高;隧洞的开挖步骤和应力旋转对衬砌支护施做时机的选择有重要影响.

According to a hydraulic tunnel project,using the D-P yield criterion and considering the incidence of the hydrostatic stress,the three-dimensional elasto-plastic FEM calculating analysis was done by ANSYS calculating software.The impact of the choice of the liner supporting material on the tunnel＇s stability and the impact of excavating course and rotation of stress direction on the choice of supporting time were studied in this paper.The calculating results showed that along with the increase of the liner supporting material＇s elastic modulus,the tunnel＇s top and bottom had the displacement trend of upwards and downwards and the tunnel＇s stability was increased too;the tunnel＇s excavating steps and the rotation of stress direction have an important impact on the choice of linear supporting time.