Abstract: In order to solve the problem of lack of irrigation water source for the ecological restoration of dump,this paper intends to build a reservoir on the top platform of the dump and analyze the influence of the reservoir on the stability of the dump. Taking a mine dump as the study object,based on the strength reduction principle,the stability of three kinds of support schemes (wall between piles,wall between piles-skeleton and wall between piles-skeleton-hardened platform) is trialed to be contrasted and analyzed by the finite element software MIDAS / GTS. The best support scheme was determined by combining the ecological restoration factors. On this basis,the influence of reservoir construction on the stability of the dump was discussed. The study results show that compared with the wall between piles support scheme,the wall between piles-skeleton support scheme and wall between piles-skeleton-hardened platform support scheme have higher safety. However,the wall between pilesskeleton-hardened platform support scheme can not significantly enhance the stability of the dump but cause part of land loss in the dump,which means the before and after reclamation available land area decreases. Therefore,the wall between piles-skeleton support scheme is considered as the best one. When the reservoir is constructed at the front of the top platform,the stability of the dump decreases with increasing reservoir capacity. When the reservoir is built in the middle or rear,the reservoir capacity increases while the stability of the dump remains basically unchanged. When the reservoir capacity is certain,the layout position moves from the front of the top platform to the middle,and the stability of the dump increases. When the layout position moves from the middle of the top platform to the rear,the stability of the dump remains basically unchanged. The study results can provide theoretical basis for the maintenance of dump slope platform and ecological restoration of dump. 

Key words: dump,reservoir,slope support,stability,ecological restoration