压力隧洞衬砌计算方法

本文介绍一种压力隧洞的衬砌计算方法，并利用该方法对某水电站压力斜井进行了计算分析。该方法根据工程区域实测地应力资料回归拟合初始应力场，在此基础上模拟隧洞开挖、衬砌及衬砌与围岩间的初始缝隙，考虑在内水压力作用下衬砌与围岩联合作用，计算衬砌裂缝的分布，裂缝开展宽度及相应的配筋率等。

A Computational Method for the Lining of Pressure Tunnel

A method of 3D FEM for pressure tunnel is introduced.An example is included by using the method in a real project.The method used here begings with simulating the initial stress field by regressing and fitting on the basis of measured data.Then it is possible to simulate the excavation of the tunnel,the lining of tunnel, and the initial crack between the concrete and the rocks.The reinforced concretes action together with the surrounding rocks under the internal water pressure may be analysed.In further computation, the method can give the crack distribution,the crack width of concrete,the reinforced ratio,etc.