Papers by Author: Jia Jun Pan

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Authors: Jia Jun Pan, Ling Jiang, Yun Chen
Abstract: No relevant high earth face rockfill dams built across a river valley with a width-to-depth ratio of more than 8.0 is reported both at home and abroad. In this paper, non-linear finite elements method is adopted to analyze the seismic response of a 139m high CFRD proposed across a river valley with a width-to-depth ratio of 9.5, and dynamic response conditions such as dam’s absolute acceleration, dynamic displacement and dynamic stress etc., are highlighted Analysis results show that under existing design conditions, due to great river valley’s width-to-depth ratio, dam’s seismic response under an earthquake action of 8 Richter Scale is not intense, but an evident whipping effect occurs at the crest, it is necessary to take corresponding anti-seismic engineering measures.
2283
Authors: Ling Jiang, Yu Juan Yang, Jia Jun Pan
Abstract: Existing research results have indicated that dam material’s rheology under a high stress state is quite evident. In order to study the influence of dam material’s rheology on the stress and deformation of a CFRD, a nine parameter power series rheology model is adopted to analyze the stress and deformation of a high CFRD considering the dam material’s rheology. Calculation results show that since an obvious increase in dam body’s deformation occurs after considering the rheology characteristics of rock-fills, dam body’s stress tends to relax. Rockfill’s rheology characteristics increases the deflection of a face slab to a certain degree, face slab’s slope and dam’s axial maximum tensile stresses rise somewhat as well. As for a high CFRD that face slabs are placed in stages and water impounds in stages, a proper rheology constitutive model is adopted to correctly simulate rock-fill’s rheology characteristics, and results from this modeling can be used for reference for the determination of dam’s filling schedule and face slab’s staged placing and have important meaning for correctly predicting dam’s stress and deformation.
2287
Authors: Jia Jun Pan, Xi Bao Rao, Yong Zhen Zuo
Abstract: Large-scale triaxial test has been conducted on various rockfill materials in an attempt to study the degrees of grain breakage. The result has shown that, the grain breakage occurred during sample preparation can not be neglected, and to maintain the initial gradation design prior to consolidation, the gradation design shall be adjusted downwards to a certain extent accordingly before sample preparation. The breakage of large-sized grains mainly occurs on the surface, and the grain breakage and confining pressure has shown linear relations after triaxial test.
1598
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