Abstract：Research purposes: Taking construction of the Taoshuping Tunnel and Humaling Tunnel of Lanzhou －Chongqing Railway as the breakthrough point and Combined with the construction difficulty，this paper analyzes the geological background，diagenetic characteristics，physical and mechanical properties of the tertiary system sandstone in Lanzhou area and their adverse effects on tunnel construction． Base on a large number of construction data and the observational records，the special research was done on the water － stability characteristics in this area to better understanding of them．The advanced treatment methods was put forward for construction．
Research conclusions: The tertiary system sandstone has unusually complex water － stability characteristics． Affected by the disturbance of surrounding rock and groundwater，its stability becomes worse obviously with time going on． Such situation was rarely seen in construction of underground cavern at home and abroad． The advanced lowering the groundwater for controlling the rate of water content of the surrounding rock below the the rate of water content of the plastic deformation of the sandstone rock and keeping the surrounding rock in basic stable state are the effective ways to solve the stability of the tertiary system sandstone．
曹峰. 兰州第三系砂岩水稳性特征隧道施工研究[J]. 铁道工程学报, 2012, 29(12): 21-25.
CAO Feng. Special Research on Water － stability Characteristics of Tertiary System Sandstone in Lanzhou Area During Tunnel Construction. 铁道工程学报, 2012, 29(12): 21-25.
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2012, Vol. 29 
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