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This research paper deals with an area of subsidence monitored in association with sliding waste dump in Soma-Eynez colliery that is located in westen Turkey. Soma lignite basin is a predominant lignite source that accounts for one third of the total coal production of Turkey. In our case, the initial subsidence was observed after a heavy rain in December, 1992 and took the form of a collapse beneath a road surface on the west side of the permit area. Subsidences continued in the field until the underground coal mining acitivity was ceased in 1998. Besides, putting the situation in a more complicated nature, landslide occurred within the spoil tip which is located at the very cast of the subsidence field, and the spoil tip material moved to the west covering top of the northeastern boundary of subsidence areas. In this case, a complex geomorphological landform arose which is called the "subsidence + landslide influence zone". The accurate position of this boundary was crucial to find out the active influence angle. Pertaining to the determination of the subsidence boundary, three different methods were employed and the obtained results were correlated with each other. |
