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中文摘要：
三维变形体离散元是模拟不连续介质力学行为的有效数值分析方法，在拱坝-坝肩整体耦合系统静、动力力抗滑稳定分析方面有突出的优点。本文利用三维变形体离散元（3DEC）考虑坝体与坝肩的相互作用，采用坝肩滑裂体动态安全系数时程、坝体应力、坝肩推力、坝肩滑裂体位移曲线联合对拱坝．坝肩系统的稳定进行安全评估。算例分析结果表明：某拱坝-坝肩系统在峰值强度为0．321g的三向地震荷载作用下，该拱坝坝肩最危险滑裂体最小瞬时抗滑稳定安全系数为2．14，同时拱坝坝体压应力没有超过容许应力，坝肩滑裂体顺河向位移收敛，因而拱坝．坝肩整体系统满足抗滑稳定安全要求。
英文摘要：
3-D deformable distinct element method（3-D DEM） is an efficient numerical method for simulation of mechanical behaviors of discontinuous media. So it is useful in the dynamic analysis of arch dam-abutment stability. Herein, analysis of the dynamic stability against sliding of an arch dam-abutment system is performed by 3-D DEM, and the dynamic safety factor, arch dam stress, dam abutment pushing force, displacement of abutment sliding blocks are used to evaluate the safety of the arch dam-abutment system. From the measured data of the threedimensional earthquake excitation with 0.321g peak acceleration, the least safety factor of the most dangerous sliding block is 2.14. The displacements of the abutment sliding blocks are convergence. The stresses of the arch dam are under the allowable stress. So the arch dam-abutment system is stable.
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