(1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400030，China；
2. College of Resources and Environmental Sciences，Chongqing University，Chongqing 400030，China；3. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam，Chongqing University，Chongqing 400030，China)
Abstract：The migration characteristics of pore water and its effect on meso-structure of tailings，which includes migration characteristics of pore water in water filling and draining processes，under load，and their effect on meso-structure of tailings，etc.，have been studied with a self-made observation testing apparatus of micro- mechanics and deformation of tailings. The results show that：the actual height of water level in tailings is higher than calculation value；the settlements of all tailings layers particles after water filling are larger than that of those without water filling under the same load；the settlements of the tailings particles after water filling could be divided into 3 stages as the increase of load：linear growth stage，steep growth stage and stable stage，and the steep growth stage occurs under the load of 200–400 kPa；the complex and tortuous channels for water migration caused by the effect of load on pore water pressure emerge in the meso-structure of tailings，which occurs at the steep growth stage；the pore water drives fine particles to move upward so as to the fine tailings become less in lower layer and more in upper layer；the settlements of tailings particles and meso-structure of tailings change little with the effect of drainage，which occurs in initial stage of drainage. This paper provides the concept and calculation method of actual saturated surface after capillary action in tailings dam，and studies the meso-structure failure mechanism by combined action of pore water migration and load，it has important actual significance to further explore for disaster mechanism affected by water and evaluate stability of tailings dam.
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YIN Guangzhi1，2，3，ZHANG Qiangui1，2，3，WEI Zuoan1，2，3，WANG Wensong1，2，GENG Weile1，2. EXPERIMENTAL STUDY OF MIGRATION CHARACTERISTICS OF PORE WATER AND ITS EFFECT ON MESO-STRUCTURE OF TAILINGS. , 2012, 31(1): 71-79.
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2012, Vol. 31 
