Disintegration Effect of Saturated Red Clay under the Action of (NH4)2CO3

LI Shan-mei; LIU Zhi-kui; MENG Jian-ping

doi:10.11988/ckyyb.20200707

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Journal of Changjiang River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (11) : 115-120. DOI: 10.11988/ckyyb.20200707

ROCKSOIL ENGINEERING

Disintegration Effect of Saturated Red Clay under the Action of (NH₄)₂CO₃

LI Shan-mei^1,2, LIU Zhi-kui^1,2, MENG Jian-ping^1,2

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Abstract

The disintegration characteristics of saturated red clay from Guilin were examined under the action of (NH₄)₂CO₃ solution of different concentrations through a self-made disintegration device. The microscopic mechanism of disintegration was analyzed from aspects including the pH value of solution, the content of elements C and N in the soil, as well as the micromorphology of soil before and after the action of (NH₄)₂CO₃. Meanwhile, the macroscopic effect of disintegration was discussed in terms of shear strength and permeability. Test results manifested that the disintegration of saturated red clay intensified with the increase of solution concentration, and the disintegration process was divided into rapid, constant and stable stages. The first stage, which lasted a short time, was mainly caused by disturbance of the ring cutter; and the second stage, as the main stage of disintegration and lasting long, was closely related with the thickness of water film, the intergranular forces, the cementation force, the strength and the permeability of soil.

Key words

saturated red clay / disintegration / (NH₄)₂CO₃ solution / shear strength / permeability coefficient / micromorphology

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LI Shan-mei, LIU Zhi-kui, MENG Jian-ping. Disintegration Effect of Saturated Red Clay under the Action of (NH₄)₂CO₃[J]. Journal of Changjiang River Scientific Research Institute. 2021, 38(11): 115-120 https://doi.org/10.11988/ckyyb.20200707

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