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<p>Sulfate saline soil has caused great harm to engineering construction due to salt heave, corrosion and poor water stability. Zeolite significantly improves the strength and salt heave of sulfate saline soil, but there are few studies on the deformation resistance of its improved soil. Therefore, confined compression experiments were carried out on the improved soil under different salt content (0.5–5%), water content (10–16%), dry density (1.55–1.65&#xa0;g/cm<sup>3</sup>), zeolite content (0–20%) and dry–wet cycle times (0–10). The results show that the coefficient of compressibility of improved soil increases with the increase in salt content and water content, but gradually decreases with dry density and zeolite content increasing. When the dry density is 1.6&#xa0;g/cm<sup>3</sup> and the zeolite content is 20%, the coefficient of compressibility of the improved soil (water content 16%) increases by 33.3% with the salt content (from 0.5 to 5%) increasing; the coefficient of compressibility of the improved soil (salt content 5%) increases by 55.0% with the water content (from 10 to 16%) increasing. When the water content is 16% and the salt content is 5%, the coefficient of compressibility of the improved soil (zeolite content 10%) decreases by 32.6% with the dry density (from 1.55 to 1.65&#xa0;g/cm<sup>3</sup>) increasing; the coefficient of compressibility of the improved soil (dry density 1.6&#xa0;g/cm<sup>3</sup>) decreases by 34.0% with the zeolite content (from 0 to 20%) increasing. The compression deformation and coefficient increase with increasing cycle times. In particular, the first dry–wet cycle has the most significant effect on compressibility. When the dry density is constant, there is a logarithmic relationship between the coefficient of compressibility of improved soil and the dry–wet cycle times under different water contents. Additionally, the improvement mechanism of zeolite on the compressibility of saline soil was discussed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The improvement mechanisms of zeolite mainly include filling large pores, absorbing water, improving the mechanical composition of saline soil and enhancing the cementation between soil particles.</p>

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Study on the compressibility of sulfate saline soil improved by zeolite considering the dry–wet cycle

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Yaling Chou,
  • Dandan Li,
  • Lijie Wang,
  • Huimin Ren,
  • Erxing Peng,
  • Yabin Zhang,
  • Fengxi Zhou

摘要

Sulfate saline soil has caused great harm to engineering construction due to salt heave, corrosion and poor water stability. Zeolite significantly improves the strength and salt heave of sulfate saline soil, but there are few studies on the deformation resistance of its improved soil. Therefore, confined compression experiments were carried out on the improved soil under different salt content (0.5–5%), water content (10–16%), dry density (1.55–1.65 g/cm3), zeolite content (0–20%) and dry–wet cycle times (0–10). The results show that the coefficient of compressibility of improved soil increases with the increase in salt content and water content, but gradually decreases with dry density and zeolite content increasing. When the dry density is 1.6 g/cm3 and the zeolite content is 20%, the coefficient of compressibility of the improved soil (water content 16%) increases by 33.3% with the salt content (from 0.5 to 5%) increasing; the coefficient of compressibility of the improved soil (salt content 5%) increases by 55.0% with the water content (from 10 to 16%) increasing. When the water content is 16% and the salt content is 5%, the coefficient of compressibility of the improved soil (zeolite content 10%) decreases by 32.6% with the dry density (from 1.55 to 1.65 g/cm3) increasing; the coefficient of compressibility of the improved soil (dry density 1.6 g/cm3) decreases by 34.0% with the zeolite content (from 0 to 20%) increasing. The compression deformation and coefficient increase with increasing cycle times. In particular, the first dry–wet cycle has the most significant effect on compressibility. When the dry density is constant, there is a logarithmic relationship between the coefficient of compressibility of improved soil and the dry–wet cycle times under different water contents. Additionally, the improvement mechanism of zeolite on the compressibility of saline soil was discussed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The improvement mechanisms of zeolite mainly include filling large pores, absorbing water, improving the mechanical composition of saline soil and enhancing the cementation between soil particles.