填方边坡碎石填土配比优化研究

在我国黄土丘陵地区,每年因为高填方边坡失稳而造成的人员伤亡和财产损失数不胜数,有必要从高填方边坡的填料入手,开展高填方边坡失稳问题研究。以陕西某高填方边坡为例,将高填方边坡的碎石填料作为主要研究控制对象,取其边坡正在填筑的碎石填料,通过诸多室内试验测定物理力学参数、渗透性等,并借助FLAC 3D数值模拟计算其稳定性,先确定最优土石比,再确定在最优土石比下的优选级配。择优选择的级配相比之前的填料,力学性能更好,强度更高,隔水效果控制更明显,坡体的整体稳定性加强。从填方填料入手,能有效降低因回填材料不合理而引发的边坡失稳。

On the Optimal Gravel Filling Ratio of High Fill Slope

In the Loess Hilly Region of China, there are numerous casualties and property losses caused by the instability of high fill slope every year. Therefore, the significance of this study is to reduce the instability of high fill slope from its fillings. Taking a high filling slope in Shaanxi Province as an example, this paper takes the gravel filling of high filling slope as the main research control object. The physical and mechanical parameters and permeability of the gravel filling are determined through many laboratory tests, and the stability of the slope is calculated by numerical simulation using FLAC 3D. First the optimal soil-rock ratio is determined, and then the optimal gradation under the optimal soil-rock ratio is obtained. Compared with previous fillings, the filling with a selected gradation has better mechanical properties, higher strength, and better water-proof performance, and, hence, the overall stability of the slope will be strengthened. With selected fillings, the instability of slope caused by unreasonable backfill materials can be effectively reduced.