Design and application of test device for tailings erosion under sand flow

doi:10.16265/j.cnki.issn 1003-3033.2020.11.024

Abstract

Abstract: In order to explore gradual failure and erosion characteristics of overtop of tailing dam, a tailing erosion test device under sand flow was developed based on dynamic theory of sediment. Then, height change of tailing sample before and after erosion was observed with horizontal pipe made of transparent acrylic plate, and water flow was continuously changed through frequency converter. Meanwhile, erosion height and time of sample before and after erosion were recorded with Vernier caliper and high-speed camera. Finally, erosion rate of tailings with different mass fraction (0%, 3%, 6%, 9%) was measured with test device, and erosion characteristics of sand bearing water flow and velocity on tailings were analyzed. The results show that erosion rate of tailings reaches its maximum under action of clean water, and it will decrease along with increase of sand content in water flow. This conclusion is consistent with previous research results, which verifies feasibility and effectiveness of the test device.

Key words: sand bearing water flow, tailings, erosion rate, test device, sand content

CLC Number:

X936

CAI Hai, WU Shangwei, WU Dongming, JING Xiaofei, WANG Wensong, KANG Qinrong. Design and application of test device for tailings erosion under sand flow[J]. China Safety Science Journal, 2020, 30(11): 162-167.

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