Experimental Study on Scour Process for Wide Graded Gravel
under Non-constant Flow Process
ZHAO Tianlong1, 2, MA Tingsen1, FU Changjing1, 2, XIAN Cailin1
(1. College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
2. Diagnostic Technology on Health of Hydraulic Structures Engineering Research Center of Chongqing
Education Commission of China, Chongqing Jiaotong University, Chongqing 400074, China)
Abstract:According to the characteristics of gravel transportation in the process of landslide dam break, three categories of seven groups of wide graded gravel were designed. The first category consisted of two groups of uniform gravel with particle size of 4 mm and 5 mm respectively, and the second one consisted of four groups of non-uniform gravel with maximum particle sizes of 20, 37.5, 53 and 75 mm respectively, and the third one was non-cohesive non-uniform gravel with the maximum particle size of 20 mm. Four groups of test flow conditions including constant flow A and B as well as non-constant flow C and D, and two types of tail-gate opening I and II were selected. A total of 25 groups test conditions were carried out. The flume scour test of wide graded gravel was carried out. The influence rule of discharge process, downstream discharge conditions and grading width of gravel on the scour characteristics of gravel was compared and analyzed. The results show that: for the non-cohesive gravel, the transportation of gravel under non-constant flow is more active than that under constant flow, which is characterized by large scouring and silting. The larger the opening of the tail-gate is, the better the downstream discharge conditions are, the more severe the scouring of gravel is, and the greater the scouring amount is. With the increase of the grading width of gravel, the position of the gravel with the largest scouring depth in the flume is gradually close to the downstream position of the flume, and the scouring amount decreases continuously.
赵天龙1,2,马廷森1,付长静1,2,冼才麟1. 非恒定流条件下宽级配土石料冲刷过程试验研究[J]. 重庆交通大学学报(自然科学版), 2020, 39(10): 93-118.
ZHAO Tianlong1, 2, MA Tingsen1, FU Changjing1, 2, XIAN Cailin1. Experimental Study on Scour Process for Wide Graded Gravel
under Non-constant Flow Process. Journal of Chongqing Jiaotong University(Natural Science), 2020, 39(10): 93-118.
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