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

PAN Jian-feng; LEI Xue-wen; MENG Qing-shan; QIN Dong-lai; FU Jin-xin

doi:10.11988/ckyyb.20211280

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

Rock-Soil Engineering

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

PAN Jian-feng^1,2, LEI Xue-wen¹, MENG Qing-shan², QIN Dong-lai^3,4, FU Jin-xin^1,2

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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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PAN Jian-feng, LEI Xue-wen, MENG Qing-shan, QIN Dong-lai, FU Jin-xin. Effect of Coarse-grain Content on Shear Properties of Coral Reef-Sand Mixtures[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(5): 118-124 https://doi.org/10.11988/ckyyb.20211280

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