摘要
为分析计算岩体边坡开挖卸荷时地应力的释放对边坡松动的影响,基于卸荷岩体力学理论,考虑了节理加载和卸荷时不同的本构关系,采用离散元法进行计算。结果表明,节理面的松动和岩块的松动共同构成了边坡岩体的松动,随着侧压力系数的增大,岩体向开挖临空面的松动位移将迅速增加,二者之间大致呈线性关系,且随着水平地应力的增大,最大松动位移出现的位置将向坡顶方向转移,整个坡面的卸荷回弹特征趋于明显,建议开挖边坡的走向尽可能与较大的水平应力方向平行。
To analyze and calculate the effect of in-situ stress in the rock slope excavation unloading on slope loose- ning, based on the unloading rock mechanics theory, it applies the discrete element method and considers different consti- tutive relationship of the joints during loading and unloading. The results show that the rock loosing includes joint opening and roch stone deformation~ the displacement of the rock mass to the free surface increases quickly with the increase of the lateral pressure coefficient~ roughly, it is a linear relationship~ besides, the position of the maximum displacement moves to the slope crest and the unloading rebound feature of the slope surface tends apparent when horizontal crustal stress in- creases. Therefore, the suggestion of the slope excavation direction should be parallel to the maximum horizontal stress in practice as far as possible is put forward.
出处
《水电能源科学》
北大核心
2012年第12期104-106,51,共4页
Water Resources and Power
关键词
岩体
边坡
卸荷
初始地应力
松动
rock mass
side slope
unloading
in-situ stress
loosening
