基于ANSYS的输水隧洞围岩及衬砌结构有限元分析

Finite Element Analysis of Wall Rock and Lining of Diversion Tunnel Based on Ansys

根据某配水工程输水隧洞的实际情况,利用ANSYS对V类围岩隧洞典型支护断面建立二维有限元模型,仿真模拟了初始应力状态、毛洞开挖、毛洞支护等施工过程,并拟定内、外水压力不同工况组合,研究了围岩和衬砌的应力、应变状态。结果表明,隧洞周边围岩拉应力值较小,压应力较大值主要集中在隧洞中部;衬砌变形呈现向下变位的特点,拐角处可能存在应力集中现象,弯矩最大值出现在衬砌中部,衬砌的最大拉应力超过了混凝土的抗拉设计强度,最大压应力未超过抗压设计强度。

According to the actual situation of a diversion tunnel, the typical section of V - class wall rock of tunnel is selected to establish two - dimension finite element model based on ANSYS. The process of construction from excavation to support is simulated so as to learn the ess - strain of wall rock and lining with different working conditions of the combination of the internal and external water pressure. The results show that, the tensile stress of wall rock around tunnel is small and the big value of compressive stress is mainly concentrated in the central tunnel. Meanwhile, there is a trend of downward deflection as well as stress concentration around the corner for the lining. The maximum bending moment occurred in the middle of lining. What＇s more, the maximum tensile stress of lining is over the design strength of concrete, but not so as the maximum compressive stress.