长江科学院院报2019，Vol.36Issue(4)：49-54,6.DOI:10.11988/ckyyb.20171069
基于PFC2D的土体缓冲落石冲击能力研究
Cushioning Capacity of Soils Against Rockfall’s Impact Force Based on Two-dimensional Particle Flow Code
摘要
Abstract
In the design of rockfall protection structure, the cushioning capacity of soils on stone cutoff wall or shed-tunnel against rockfall’s impact force should be taken into consideration properly. PFC2D could simulate the dy-namic process of rockfall impacting on the soil and structure effectively. The calculated result of rockfall’s impact force by PFC2D with no consideration of soil’s cushioning capacity is consistent with that by Swedish algorithm ( proposed by Dr. Vincent Labiouse) and slightly larger than that by Japanese algorithm ( proposed by Japanese Road Association) . Furthermore, the impact forces of rockfall from different heights on structure with soil cush-ions—plain filling soil, silty clay, and sandy silty soil each of different thicknesses—are analyzed. The cushioning capacity of soil is in exponential function relation with soil cushion’s thickness and rockfall’s height; while the in-fluence of falling height on cushioning capacity does not change with the change of soil material. Given the same soil thickness, the cushion capacity of silty clay is the largest, followed by that of plain filling soil and sandy silty soil in sequence. From an economic point of view, the thickness of soil cushion is recommended to be within 2-3 meters in engineering practice.关键词
落石防护措施/土体缓冲能力/落石冲击力/ PFC2D/缓冲土层厚度Key words
protective measures against rockfall/ cushioning capacity of soil/ rockfall’s impact force/ PFC2D/thickness of soil cushion分类
建筑与水利引用本文复制引用
江巍,宋鹏程,陈玮,王彦海,毛聪..基于PFC2D的土体缓冲落石冲击能力研究[J].长江科学院院报,2019,36(4):49-54,6.基金项目
国家重点研发计划项目(2016YFC0401909) （2016YFC0401909）
