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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。
In order to analyze and calculate the influence of the release of the geostress on slope loosening during rock excavation unloading, based on the mechanics theory of unloading rock mass, the different constitutive relations at joint loading and unloading are considered, and the discrete element method Calculate. The results show that the loosening of joints and the loosening of rock mass together constitute the loosening of slope rock mass. As the lateral pressure coefficient increases, the loose displacement of rock mass to the excavation face will increase rapidly. And the horizontal displacement increases with the increase of horizontal stress, the position where the maximum loosening displacement will shift toward the top of the slope, and the unloading rebound feature of the whole slope tends to be obvious. It is suggested that the direction of excavation slope should be as far as possible Parallel to the larger horizontal stress direction.