Based on the engineering and hydrological geological condition in Chengmen Lake, the prop-erties of earthrock compound and silt at the lake bottom are analyzed and geo-mechanical model of the soft foundation earth-rock dam is established. The stability of the dam under the impact of fluctuating lake waters and lakebed silt extrusion is simulated with FLAC3D. The stability and safety of the dam are assessed under the criteria of displacement mutation as well as deformation. The results reveal the deformation and displacement law of the dam under various actions of external conditions, which provide certain theoretical guide to treatment and maintenance of the dam.
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