小湾水电站左岸坝前堆积体在自然状态下稳定性的平面离散元与有限元分析

2 D DEM AND FEM ANALYSES ON STABILITY OF DEPOSIT BODY IN FRONT OF DAM ON THE LEFT BANK OF XIAOWAN HYDROPOWER STATION

使用平面离散元法（ＵＤＥＣ）和有限元法对小湾水电站左岸坝前堆积体在自然状态下的稳定性初步进行了二维数值计算与分析， 得到该堆积体应力和变形状态的定量结果， 对堆积体的稳定性有了相应的认识。

The deposit body in front of dam on the left bank of Xiaowan hydropower station is the largest deposit body neighboring closely with the dame foundation. According to the geological investigation, no relative weak surfaces which are unfavorable to the stability of whole deposit body exist in the lower bed rock, so the relative weak plane should be the talus material on the bed rock or the contact surface between the talus material and the bed rock, and the stability of the relative weak surface depends on the shear strength of the talus material (or the contact surface). For this reason the 2D DEM (UDEC) and FEM are used to analyze primarily the stability of the deposit body under natural state, and the corresponding knowledge is obtained.