高类别水工隧洞围岩稳定性数值分析

Numerical simulation analysis of surrounding rock stability of outlet tunnel of a water diversion project

通过有限元数值模拟软件ANSYS对十堰市中心城区引水工程出水口的围岩稳定性进行分析评价。模拟结果表明,该出水口的洞顶沉降和洞底隆起明显大于洞侧壁的卸荷回弹位移,在施加支护后,隧洞围岩在X方向和Y方向的位移减小幅度分别为42.47%和45.86%,支护效果明显。围岩的最大第一主应力和最大第三主应力分布在洞底和侧壁夹角和洞底处,在实际工程中,对该位置应重点关注。

Based on the water diversion project in the central area of Shiyan City,the stability of surrounding rock at the water outlet of the project is analyzed and evaluated by finite element numerical simulation software ANSYS according to the actual engineering background and engineering geological conditions.The simulation results show that the roof settlement and bottom uplift of the outlet are obviously larger than the unloading and rebound displacement of the side wall of the tunnel.After applying the support,the displacement of surrounding rock in the X direction and Y direction decreases by 42.47%and 45.86%,respectively,indicating that the support effect is obvious.The maximum first principal stress and the maximum third principal stress of the surrounding rock are distributed at the Angle between the bottom and the side wall and the bottom of the cave,which should be paid more attention to in practical engineering.