Research conclusions: Taking construction of large railway tunnel as an example,this paper mainly studies the activities and balance laws of underground water,the influence of geological disasters caused by underground water and water leakage on tunnel construction,the importance of underground water control,and the technical standards and measures for underground water control.

Hydrogeology character and flood prevention and cure in Balitang Coal Mine;

Twofold significance of ground water pollution prevention in China's water pollution control

In this article,author describes different constitution measures of construction joint in underground waterproof structure,analyses and compares advantages and disadvantages of different measures,and presents selection measures of the constitution of construction joints which might provide guidance for engineering design and construction.

On the basis of the practical project,author introduces the construction and supervision control points of EPDM in underground waterproof engineering,which contribute to ensure the quilt of the underground waterproof engineering.

In construction of the underground waterproofing engineering of the nuclear island of Tianwan Nuclear Power Station, engineers adopted self\|waterproof concrete structures and an overall outer\|pack waterproof coiled material layer as main waterproof measures, and used a layered drain system as secondary waterproof measures to form a compound waterproof and drain construction method.