The Geomechanical Analysis Of Fuxin Basin

By means of the theories and methods of Geomecha-nics, this paper presents analysis of the geological structure, structural systems and structural evolution of Fuxin Basin, explaination of the formation of basin, discussion of the regulation of structural system con- trol on coal-forming and distribution and prediction of some coalfields.There mainly exist the traces of the Latitudinal Structural System, the North-West Structural System and the Neocathaysian Structural System in Fuxin Basin and adjacent areas. Among them, the North-West Struc-tural System can be divided into former and later phase systems, the Neocathaysian Structural System includes early, middle and later phase systems. They occured in either sequence or intersection overlapped each other and constituted the present basin structural framework. The Latitudinal Structural System formed earliest, and laid the foundation of the basin. It belongs to the pre-basin forming structure. The Early Neocathaysian made up the embryamie form of Fuxin Basin. The North-West Structural System, being the main basin-forming structural system, played a decisive part in the formation and development of the basin. The Middle and the Later Neocathaysian Systems is paet of post basin forming structure basically. The syndepositional rise in depression which distributes approximately in the central part of the basin controlled coal accumu- lation belts. The first and the second scale NWW-NW anticlines controlled the coal auumulation centre and area of every coal-forming phase. The less scale NWW-NW anticlines controlled coal rich belts and bodies. The transposition compound parts between the NNE-NE and the NWW-NW anticlines often made up structural dome or short axis anticline, which made coal seamshallow and favoured open-cutting. According to the equal distance distribution feature of coal accumu- lation areas controlled by NWW-NW anticline, author predicts that the south area of Mahutun River is the long-range area that have not been cut and exploited before.Basing on above analysis and by means of the theories and methods of Geomechanics, the author reasonably explained a series of geological phenomena or problems that former geologists have not resolved yet.