Survey of Tunnel Construction and The Discussion of Construction Countermeasures Under Special Geological Conditions

Tunnel engineering surveying is an important part of underground engineering surveying,it isthe surveying at planning,survey design,construction and operation management of the tunnel engineering,It plays a key role to the construction of underground engineering.At the same time,A complex geological environment will also be a decisive influence on the tunnel construction.This article is as a case of Mao Tian-shan Tunnel in Bao-xi Railway,detailed control survey outside hole,plane control inside the hole,the control survey of mid-line and elevation and the calculation method of breakthrough error of the tunnel construction.And finally discusses the countermeasures of tunnel construction under special geological conditions.