Experimental investigation of dry granular flow impact via both normal and tangential force measurements
Experimental investigation of dry granular flow impact via both normal and tangential force measurements
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DOI：
10.1680/geolett.15.00003
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发表时间：
2015-09
影响因子：
2.1
通讯作者：
Yuan-jun Jiang;Y. Zhao
中科院分区：
文献类型：
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作者：
Yuan-jun Jiang;Y. Zhao
颗粒流的研究对崩塌、泥石流等自然灾害的研究具有重要意义。在这种情况下，颗粒流对挡土墙的冲击进行了研究，通过测量法向和切向的子力。在冲击过程中，切向子力相对于壁面由正向变为负向，根据滞止区的发展可分为两种冲击状态。在此过程中，颗粒材料与壁面之间的界面摩擦力是根据法向力和切向力计算的，并定义为等效界面摩擦角，观察到该摩擦角是变化的，并且小于界面摩擦试验中测量的值。等效界面摩擦角的绝对值随边坡角的增大而减小。还观察到，壁的界面摩擦角的减小对冲击力计算的影响可以忽略不计，而水槽底部的界面摩擦角的减小导致力的显著高估。这些发现将对颗粒流的研究及其应用有重要的帮助。
The study of granular flow is important for natural hazards such as avalanche and debris flow. In this context, granular flow impact against a retaining wall was investigated through the measurement of both normal and tangential sub-forces. The tangential sub-forces change from positive to negative with respect to the wall in the impact process, which can be classified into two impact states according to the development of the stagnant zone. In the process, interface friction between the granular material and the wall is calculated according to normal and tangential forces and defined as the equivalent interface friction angle, which is observed to vary, and is smaller than the value measured in interface friction tests. The absolute value of the equivalent interface friction angle decreases with slope angle. It was also observed that a reduction in the interface friction angle of the wall has a negligible influence on the impact force calculation, while a reduction in the interface friction angle of the flume base leads to a significant overestimation of the force. These findings should significantly aid the study of granular flow and its applications.