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30-06-2020 | Original Paper | Issue 10/2020

Bulletin of Engineering Geology and the Environment 10/2020

Mechanical properties and stabilizing mechanism of stabilized saline soils with four stabilizers

Journal:
Bulletin of Engineering Geology and the Environment > Issue 10/2020
Authors:
Li Wei, Shouxi Chai, Qinglin Guo, Pei Wang, Fang Li
Important notes

Highlights

1. Optimization of stabilizing methods used with lime, cement, fly ash, and SH agent.
2. Unconfined compressive test, triaxial compressive test, splitting tensile test, and fatigue test were carried out.
3. Microstructure feature of stabilized soil was discovered on the basis of three parameters of SEM photos.
4. Stabilizing mechanism was investigated by means of SEM, XRD, FTIR, and TGA.

Abstract

Saline soil used in embankment construction causes dissolution falling and salt swelling, which results in embankment cracking. Therefore, saline soils should be stabilized in engineering. The unconfined compressive strength test, triaxial compressive test, splitting tensile test, and fatigue test were conducted on six types of stabilized soils. Subsequently, scanning electron microscopy test, X-ray diffraction test, Fourier transform infrared spectroscopy test, and thermogravimetric analysis were performed to discover the stabilizing mechanism. Test results indicated that the mechanical properties of saline soil were improved by adding lime, cement, fly ash, and SH agent (SH). In particular, after soaking, the strength of the stabilized soil with SH was significantly enhanced, the deviatoric stress-strain curves transformed from strain softening to strain hardening, and the tensile property and fatigue resistance were improved as well. The SH generated a film and silk-like web, wrapped the soil particles, and filled the soil pores, which improved the strength and anti-deformation abilities of the stabilized soils.

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