Volume 27 Issue s1
Dec.  2019
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DENG Jianliang, ZHANG Xiangxia, HUANG Fengrong. 2019: STUDY ON TRANSPORT MECHANISM OF BLOCKS BY SUBAQUEOUS DEBRIS FLOW IN ROTATING FLUME TEST. JOURNAL OF ENGINEERING GEOLOGY, 27(s1): 251-256. doi: 10.13544/j.cnki.jeg.2019098
Citation: DENG Jianliang, ZHANG Xiangxia, HUANG Fengrong. 2019: STUDY ON TRANSPORT MECHANISM OF BLOCKS BY SUBAQUEOUS DEBRIS FLOW IN ROTATING FLUME TEST. JOURNAL OF ENGINEERING GEOLOGY, 27(s1): 251-256. doi: 10.13544/j.cnki.jeg.2019098

STUDY ON TRANSPORT MECHANISM OF BLOCKS BY SUBAQUEOUS DEBRIS FLOW IN ROTATING FLUME TEST

doi: 10.13544/j.cnki.jeg.2019098
Funds:

This study is supported by the National Key R&D Program of China(Grant No.2016YFC0401908) and Construction of Scientific Research Projects in Zhejiang Province (Grant No.2018K104)

  • Received Date: 2019-05-31
  • Rev Recd Date: 2019-07-03
  • The subaqueous debris flow and its huge block transport capacity have attracted wide attention. In this study, a self-developed rotating flume was used to make a stable circulating subaqueous debris flow, and the location of transported block in subaqueous debris flow was measured. The 300-mesh silica sand was used to make the subaqueous debris flow; the blocks such as quartz rock block, PVC block and glass bead was used to observe the transport phenomenon. The observations confirmed that the subaqueous debris flow can transport the block to the vicinity of the head, and the transport capacity is related to the underwater debris flow and the nature of the block:ifthe bulk density is lower than the dense flow density, the subaqueous debris flow can transport the block to the head position; if the bulk density is much larger than the dense flow density, then the block can only be in the tail or middle location of dense flow, always unable to reach the head position; the stability of the block motion in the subaqueous debris flow is related to the thickness of the block. Considering the effects of dense flow rate, density of the block and size of the block, the transport mechanism of blocks by subaqueous debris flow in rotating flume test was proposed.
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