DIVISION AND QUALITATIVE EVALUATION OF ENGINNEERING GEOENVIRONMENT ON NANSHA ISLANDS

Nansha Islands have abundant natural resources, but there exist complex geoengineering conditions and frequent geological hazards.It is important and essential to survey and evaluate the engineering geoenvironment. On the basis of analyzing geological structure, active faults, volcanoes and earthquakes, and conbinination with the hydrodynamic conditions, the engineering geoenvironment in Nansha area is divided into 5 zones: southern continental shelf zone, western continental slope zone, Nansha trough zone, Liyuetan shoal zone and coral reef zone and the engineering-geological features in each zone are also analyzed. A fuzzy mathematic method is used to qualitatively assess the engineering geoenvironmental on Nansha Islands. the evaluation result is more objective and reasonable and provides a basis support of engineering geoenvironment for planning of resource development in Nansha Islands area.