A new method for constructing a digital model of soil-rock mixture is proposed in this paper. Using this method, rock blocks of arbitrary shapes can be considered and the construction of soil-rock mixtures with different block size distribution and rock content can be realized. First, through digital image processing, a large number of rock block contours that are analogous with reality are obtained. Then, a corresponding rock block library is established. Next, an improved intersection detection algorithm based on axis-aligned bounding box is developed to construct the digital model of the soil-rock mixture slope. Furthermore, the stabilities of soil-rock mixture slopes with different block size distribution and rock content are investigated. The results show that the soil-rock mixture slope exhibits multiple sliding zone under the combined action of various plastic zone expansion. And the influence of block size distribution and rock content on the stability of soil-rock mixture slope has a coupling effect.

提出了一种建立土石混合体数字化模型的新方法。使用这种方法，可以考虑任意形状的岩石块，并且可以实现具有不同块尺寸分布和岩石含量的土石混合物的构造。首先，通过数字图像处理，获得了大量与现实相似的岩石块轮廓。然后，建立相应的岩石块库。其次，提出了一种改进的基于轴心边界框的相交检测算法，建立了土石混合体边坡的数字模型。此外，研究了不同块尺寸分布和岩石含量的土石混合体边坡的稳定性。结果表明，在各种塑性区扩展共同作用下，土石混合体边坡呈现出多个滑动带。块体分布和岩石含量对土石混合料边坡稳定性的影响具有耦合作用。