HYDROGEOLOGY INVESTIGATION AND CHARACTERISTICS ANALYSIS OF SEEPAGE FIELD FOR COASTAL MINE IN DEEP EXPLOITATION

Sanshandao gold mine is located in coastal zone of Lai-Zhou Bay of Shandong Province. It is one of the main mines of Shandong(Laizhou) Gold Group Co.,Ltd. Owing to its special geographical location and complex hydrogeological conditions, large-scale mining engineering is confronted with water-bursting hidden danger. Based on this background, hydrogeological characteristics of the gold mine is regionally divided and evaluated through consideration of fault influence. Joint fracture survey work for 3 levels, where located in deep position of mine area, is implemented. In addition, joints distribution laws of hanging wall, orebody and footwall are studied. Permeability coefficient of deep rock is calculated and reasonably modified on basis of geometry parameters measurement and Monte-Carlo method. With the help of FLAC^3D numerical calculation means, evolution characteristics and influence scope of seepage field during future deep mining process are forecasted. Achieved results can provide certain guiding significance to safety ensuring projects of deep exploitation mine under complex hydrogeological conditions.