高铁长大隧道群独立控制网建立方法

雪峰山隧道群总长达27．628km，洞外地形复杂，按规范要求，应建立隧道洞外独立控制网。但如何在这样的隧道群中建立控制整个隧道群施工的统一的独立控制网，如何把不同投影带内的洞外控制点统一在一个坐标系中，都将是施工所面临的问题。本文首先将介绍雪峰山隧道群坐标系现状，在此基础上，根据建立独立控制网的一点一方向平差原理，介绍两种求解独立控制网方向角的方法，并利用这2种方法进行该隧道数据的计算和验证，从而证明利用该方法在长大隧道群的独立控制网建网是可行的。

Method about establishing the independent control network for long tunnel group in high -speed railway

The Xuefeng Mountain tunnel group has a total length of 27. 628 km, with a complex terrain outside the tunnels, thus the independent control network outside the tunnel should be established according to the speci- fications. But how to set up a unified independent control network which is employed to control the construction of the whole tunnel group in such a tunnel group and how to put the control points into a unified coordinate sys- tem which are outside the tunnel in different projecting zones are both problems facing the construction. The cur- rent situation of the coordinate system for the Xuefeng Mountain tunnel group was introduced first in this litera- ture. Based on this, according to the adjustment principle which uses one point and one direction to establish control network, two ways of solving the direction - angle of the independent control network were introduced. Then these two ways were employed to compute and prove the data gathered from the tunnel, which it proves that this method is practical when establishing the independent control network for long tunnel group.