Farmland dynamic construction elevation model of concurrent mining and reclamation and case study

In the progress of making Concurrent Mining and Reclamation ( CMR) plan,the construction of elevation model of reclaiming farmland is crucial for field implementation,and at the same time,it determines if the whole recla- mation project would be success or not. Based on the CMR,the theoretical model of farmland dynamic construction ele- vation was established with the careful analysis of its three influence factors. Then combined with dynamic subsidence model and probability integration theory,the mathematical models of farmland dynamic construction elevation were separately established in single and multiple coal seams mining conditions with the consideration of different subsid- ence situations on ground surface. Then,a coal mine with high groundwater table in Anhui province was selected as an example to verify the mode. Dynamic construction elevations of A1 and A2 were simulated and calculated by using cor- responding mathematical models in two different reclaiming construc-tion times. When the construction time was 210th day,the construction elevation of two points were 23. 6 m and 24. 2 m. While the construction time was 296th day,the construction elevation of two points were 22. 9 m and 23. 7 m. The result showed that this model had a favorable appli- cability and could conveniently guide the field con-struction which would promote the widespread utilization of CMR technology.