Abstract：Exploitation of mine resources will exert potential threats upon the safe operation of important hydraulic engineering projects in China. Based on practical projects and field monitoring curves of coal mining near an ore district，numerical simulation method is employed for the back analysis of mechanical parameters of rocks and soils in Yangcun Ore District. The impacts on the security of Xifeihe River left embankment under coal mining are evaluated with elastoplastic model，two-exponent rheological model and probability integral method. Based on current national regulations or codes and over 40-year practical mine experiences in China，the controlling indices and the reduction factor for deformation of Xifei River left embankment by coal mining are primarily presented. On the basis of above results，the proposed scheme 3(600 m far from embankment) is recommended for a formal mining scheme；and corresponding comprehensive protection measures are presented. It can offer a scientific basis and can be served as a reference to the similar projects，such as mining at Nansi Lake and mining at the major channels of Middle Route of South-to-North Water Transfer Project.
