DISCUSSIONS ON CHAIN OF 3F PROBLEM FOR ENGINEERING GEOLOGICAL ENVIRONMENT IN SHANXI

The fragile geological environment and fulsome engineering activities can cause frequent geological disasters in Shanxi(referred to as the 3F problem chain). The fragile geological environment has many performances, including：gully topography in the East Loess Plateau, mountainous topography pattern inLvliang(Mountain) Taihang(Mountain) sandwiched five basins,the Fen River passes through the middle of Shanxi, active new tectonic activities, distribution of loess, red clay, soft soil, saline soil and other special soil, sparse vegetation and serious soil erosion. The excessive human engineering activities including the construction of towns in mountain areas, engineering exploration and mining activities have the characteristics of high density and strength, which has a strong influence on the geological environment. The induced various engineering or mining geological disasters have associated with the characteristics in a chain or a family. The diversification rend of geological environment damage is obvious. Based on the analysis of 3F chain issues, this paper discusses on the oretical issues, the whole idea need to be solved and the scientific solution for such problems with systematic concept and global outlook. A profound understanding and in-depth study of 3F chain is also the fundamental way to solve the problems of geological disasters and geological environmental issues in Shanxi.