高陡岩质边坡稳定性三维离散元分析

某高陡岩质边坡地质条件复杂、软弱结构面发育、开挖高度大、坡度陡、临空面多,为边坡变形提供了有利的空间,边坡多处出现失稳破坏迹象。通过对边坡工程地质条件调查,岩体结构特征和边坡开挖等影响因素的分析,认为边坡变形主要发生在强风化强卸荷岩体内,受软弱结构面的控制比较明显,表现为结构面组合控制的块体变形失稳破坏模式。采用3DEC数值模拟软件,模拟了边坡开挖后坡体变形特征,数值模拟结果表明,边坡浅表层块体以及控制性块体稳定性差,可能导致边坡产生整体失稳。

3DEC STABILITY ANALYSIS OF HIGH AND STEEP ROCK SLOPE

The geological condition of a high and steep slope is complex.Its weak structural planes well develop.The excavated height and ratio are high.The excavated faces are many for the sake of the space of the deformation.There are many failure evidences at the slope.On the basis of geological condition investigation,the rock mass structure and the affected factors of the slope are studied.It indicates that the deformation of the slope is controlled by weak structural planes in weathered and off-loaded rock mass.The deformation and failure mode is block failure by combination relations of structural planes.The future deformation characters are simulated with 3DEC.The monitored data shows that the stability of the superficial and the manipulative block is low.The whole slope could fail.