| Summary: | 博士 === 國立中央大學 === 土木工程學系 === 104 === Coal is the most common material used in thermal power plant, and coal ash is the end product after the power generation. The main treatment of coal ash is to hydraulically transport to the ash pound which was built near the power plant, then it become a newly reclaimed land. The new power generator, coal bunker, and wind turbines can be built on this newly land because these facilities always use pile as its foundations. Therefore the pile loading behavior in ash pound is very important for engineer to study. In this study, undisturbed samples and remolded samples are used to conduct a series of laboratories including physical, chemical, and mechanical tests to study the geotechnical properties of coal ash. The test results show that specific gravity of coal ash is 2.29 to 2.37, and complete the primary consolidation in very short time. The filed axial pile load test results in coal ash pound built in Taichung and Linkou thermal power plant show that the effect of improvement is more significant in strain softerning zone. This study designs a model pile test which can provide one way and two way cyclic loading which the highest frequency is up to 0.1Hz and at least 10000 cycles. By using this test equipment, this reserch study the relationship of pile head stiffness, axial load on pile, pile head displacement, and the load cycles. The test results show that the pile displacement will not increase at the small cyclic amplitude after high cycles. The loading type will effect the pile displacement. The cyclic amplitude and number of cycles will not effet resudial load along the pile, and the nuber of cycles will effect the resudial end bearing load of the pile.
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