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Abstract Concrete-rockfill combination dam(CRC dam) is a new type of dams. The stability of the concrete wall and the whole dam was influenced by the value and distribution of earth pressure. A model test was carried out to measure the distribution of earth pressure along the height of the wall and to investigate the displacement mode in rock filling and water impoundment periods. According to the results of loading and unloading triaxial test，the non-linear relationships between the wall displacement and the mobilized internal friction angle，the friction angle between the concrete wall and the rockfill were established under the quasi-limit state. The concept of initial displacement was proposed，and a calculation method of quasi-limit state earth pressure considering the displacement was deduced. The result shows that the displacement of the concrete wall was mainly the mode of translation. Earth pressure varied with the displacement of the concrete wall obviously，and the earth pressure at the end of impoundment period was approximate twice than that in the filling period. The proposed formula reflected well the change of earth pressure with wall displacement and is an effective supplement to Coulomb?s theoretical formula.
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2016, Vol. 35 
