摘要: 松散体结构松散，是崩塌、滑坡等地质灾害的主要物源，致灾范围受含石量和坡度等因素影响较大；传统方法对松散体滑动堆积特性研究多为定性，很难对其内在机理进行解释. 而基于离散元方法可定量研究不同含石量和坡度对松散颗粒滑动后的冲程、堆积宽度、最大厚度、堆积面积、堆积轮廓形状、堆积区体积折减、静堆积角、累积质量等堆积特征值的影响规律，并从粒子能量和接触力角度解释了松散颗粒堆积特性的内在机理. 计算结果表明：含石量在0%～70%范围增加，冲程、堆积宽度和堆积面积均先增大后递减，最终累积质量越小，含石量与静堆积角呈二次多项式关系模型；坡度在30°～65°范围增大，冲程、堆积宽度、堆积面积和累积质量均会变大，最大厚度均会变小，坡度与静堆积角呈对数关系模型，坡度对堆积轮廓平面形状影响显著；在堆积区颗粒分布中，细、粗颗粒的体积占比出现拐点. 研究结果可为深入分析松散颗粒滑动堆积特性和该类灾害范围预测及评估提供参考.
Sliding accumulation characteristics of loose materials and its influencing factors based on discrete element method
- Received Date:
14 February 2020
- Available Online:
18 May 2020
Abstract: Loose materials is the main source of geological disasters such as collapse and landslide. The disaster range is greatly affected by factors such as rock content and slope. The research on the sliding and accumulation characteristics of loose materials by traditional methods is mostly qualitative, and it is difficult to explain its internal mechanism. And based on the discrete element method can be quantitative research of different rock content and slope of granular sliding after stroke, accumulation width, thickness and accumulation area, accumulation profile shape, accumulation zone volume reduction, static accumulation Angle and cumulative mass the influence law of accumulation characteristic values, and explained from of particle energy and contact force the internal mechanism of granular accumulation characteristics. The results show that: the rock content increases in the range of 0% ~ 70%, the stroke, the accumulation width and the accumulation area all increase first and then decrease, the final cumulative mass is smaller, and the relationship between the rock content and the static accumulation Angle is quadratic polynomial. When the slope increases in the range of 30° ~ 65°, the stroke, accumulation width, accumulation area and cumulative mass will all increase, and the maximum thickness will decrease. The slope and static accumulation Angle show a logarithmic relation model, and the slope has a significant influence on the contour shape of plane accumulation. In the distribution of particles in the accumulation area, the volume proportion of fine and coarse particles all appeared inflection point. The results can be used as a reference for the