论文部分内容阅读
土石混合体作为自然界中常见的一类岩土体,尤其在我国西南地区存在着不同成因及规模的土石混合体边坡,这些边坡的稳定性问题对于工程在施工及运营期间的安全性有着重要的意义。在传统的边坡稳定性分析中,通常将土石混合体边坡视为均质土坡,忽略其内部块石的存在,这给计算结果带来了很大的误差。运用数字图像处理技术,对西南地区一土石混合体边坡进行分析,建立其细观结构模型。在此基础上,运用有限元强度折减法开展相应的稳定性研究。结果表明,块石的存在使边坡内部应力场分布变得极其不均匀,计算搜索得到的滑动带具有明显的绕石特征,考虑块石时计算得到的稳定系数要较等效均质土坡的稳定系数高。
As a common type of rock and soil mass in nature, the mixture of rock and soil has many different causes and sizes of rock-soil mixture slopes in southwestern China. The stability of these slopes has a great influence on the safety during construction and operation Significance. In the traditional slope stability analysis, the slope of soil-rock mixture is usually regarded as a homogeneous soil slope, ignoring the existence of internal stones, which brings great error to the calculation results. Using digital image processing technology, an earth-rock mixture slope in Southwest China is analyzed, and its meso-structure model is established. On the basis of this, the corresponding stability study is carried out by using finite element strength reduction method. The results show that the existence of rock mass makes the distribution of stress field in the slope extremely uneven, and the calculated slip band has obvious characteristics of winding stone. The stability coefficient calculated from the rock mass is more equal than that of the equivalent homogeneous soil slope The stability factor is high.