Journal of Yangtze River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (5): 118-124.DOI: 10.11988/ckyyb.20211280

• Rock-Soil Engineering • Previous Articles     Next Articles

Effect of Coarse-grain Content on Shear Properties of Coral Reef-Sand Mixtures

PAN Jian-feng1,2, LEI Xue-wen1, MENG Qing-shan2, QIN Dong-lai3,4, FU Jin-xin1,2   

  1. 1. School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;
    2. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics, Chinese Academy of Sciences,Wuhan 430071,China;
    3. University of Chinese Academy of Sciences, Beijing 100049,China;
    4. Southwest Engineering Corporation Limited of China Communications Construction First Harbor Engineering Bureau,Yulin 537000,China
  • Received:2021-11-29 Revised:2022-03-29 Online:2023-05-01 Published:2023-05-22

Abstract: Coral reef-sand mixture is an important supporting layer of infrastructure. To investigate the effect of particle gradation composition on shear strength and dilatation of coral reef-sand mixtures, simple shear tests were performed using fully automatic medium-sized stacked ring direct shear instrument. The tests were conducted on samples with varied P5 content and water content under four different normal stresses of 50, 100, 200, and 400 kPa. The experimental results show that the shear strength of coral reef-sand mixtures first increases and then decreases with the increase of P5 content. The shear strength reaches its maximum when P5 content is 25%-50%. In the shearing process, coral reef-sand mixtures contracted first and then dilated. P5 content has a significant effect on dilatation, internal friction angle, and apparent cohesion. Water content weakens the shear strength of coral reef sand mixture.

Key words: coral reef-sand mixtures, P5 content, simple shear test, shear properties, water content

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