考虑到岩体尺寸效应的深凹岩石边坡角的确定

Way to Determine Stable Slope Angle of Furrow Pits Considering Size Effects of Rock Mass

以喇叭形曲面边坡上环岩体为力学模型 ,分析其临界下滑时的应力状态 ,以库仑准则作为环岩体的破坏准则 ,并考虑到环岩体的尺寸效应 ,推导出了深凹边坡的临界稳定性坡角与岩体的物理参数 ,及边坡水平半径之间的关系式。该式反应了深凹边坡的稳定性坡角可随着开挖深度增加而增大的规律 ,为采用减少深凹露天矿底部废石剥离量的凸曲线形边坡奠定了理论基础 。

By means of taking the circle rock on the trumpet slope as a mechanics model, analyzing its stress state using Coulomb's criterion and considering size effects of the rock mass, the relation function for stable slope angle, the angle of internal friction, the cohesion, the unit weight and the horizontal radius of furrow pit is derived in this paper. The relation function shows that the deeper the furrow pit is excavated, the greater the stable slope angle is. Both the theory base for reducing stripping in furrow pits and the basic way to determine the configuration of the stable slope are developed from the function.