铁道科学与工程学报2017，Vol.14Issue(7)：1398-1406,9.
细砂型泥石流诱发机制试验研究及数值分析
Experimental study and numerical analysis on triggering mechanism of fine-grained sand debris flow
摘要
Abstract
Combined with advanced digital imaging and processing technology, the refined model tests of fine-grained sand debris flow were carried out. Through the experiments, the debris flow could be divided into four stages of inflation,erosion,main damage and destruction. With the increase of fine sand content, the time of the main sliding soil was accelerated, and the soil mobility was strengthened. It showed different failure modes of flow types, composite and hierarchical macroscopically. From the meso view point, the soil porosity decreased and then increased, the average contact number increased and then decreased, the long axis of the particles was rotated, and the distribution of particles was uniform during the process of debris flow, which showed the interaction between soil and water was complex. Based on the finite element method, the transient analysis on sandy soil seepage during rainfall infiltration stage was carried out by considering the characteristics of unsaturated soil sand through soil water characteristics. The fluid velocity vector direction in the sand transited gradually from near vertical soil surface to the foot of the slope direction, equipotential lines gradually rotated to the direction of the slope, maximum seepage velocity and penetration appeared in the middle part of the triangular slope, which indicated the whole sliding failure coming soon, and the result of the experiment were verified.关键词
细砂型泥石流/诱发机制/细观角度/有限元方法/渗透力Key words
fine sand debris flow/triggering mechanism/mesoscopic view/finite element method/penetration分类
资源环境引用本文复制引用
姚志雄..细砂型泥石流诱发机制试验研究及数值分析[J].铁道科学与工程学报,2017,14(7):1398-1406,9.基金项目
国家自然科学基金资助项目(41272296,51504070) （41272296,51504070）
校科研启动基金资助项目(GY-Z14069) （GY-Z14069）
福建省自然科学基金面上项目(2016J01205) （2016J01205）
