| The numbers and the height of tailings dams increase quickly with the increase of the need for mineral in China. The mine company is in urgent need to solve the problems of tailings disposal for sustainable development and environmental protection. The tailing dam at tiger rock in Huidong of Sichuan province are taken as example. The main research work of this dissertation is as follow:1. The chemic element, particle distribution and seepage condition of tailings material are investigated by a lot of physical experiment. Compress and strength properties are studied by compress test and direct tests experiment.2. Through the cyclic triaxial instrument, the dynamic modulus, damping ratio and dynamic properties of the silty sand and the silt of the tailing dam are studied. The dynamical strength and parameters were ensured and some affecting factors such as confining pressure, consolidated stress ratio and dry density are discussed. Because of the high dry density the dynamical strength of silty sand is higher than those of ordinary sands. If the dry density is less than or equals to 1.96 g/cm~3 and the consolidated stress ratio "K_c" less than or equals to 1.5, the samples could be liquefied. If the dry density exceeds or equals to 2.02 g/cm~3 or the consolidated stress ratio exceeds or equals to 2.0, the samples could not be liquefied in the condition of equivalent-pressure. The dynamic modulus of two material is higher and damping ratio is lower, so the material has well properties of anti_liquefaction.3. the stability of tailing dam is analysed with strength reduction methods using the physical and parameters of tailings. The safety factor of are 2.36 and 1.79. Some...
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