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<p>Rapid infrastructure growth demands competent foundation soils; however, suitable conditions are not always available. Soil stabilization techniques therefore play an important role in improving the engineering behavior of weak soils. In addition to conventional stabilizers, several industrial by-products have been successfully used for sustainable soil improvement. However, chemical stabilizers often have limitations in terms of environmental impact and optimal dosage. Microbially Induced Calcite Precipitation (MICP) provides an environmentally friendly alternative that can be used in combination with chemical stabilization methods. In the present study, expansive soil was stabilized using 10% Ground Granulated Blast Furnace Slag (GGBS) along with biostimulation-induced MICP. The improvement in soil properties was evaluated through unconfined compressive strength tests and consolidation tests to assess changes in swelling pressure and compression index. Microstructural analyses were conducted using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to confirm the stabilization mechanisms. In addition, model tank experiments were performed to evaluate the effectiveness of the stabilized soil in reducing rainfall-induced erosion and improving slope load-carrying capacity. The results show that the combined stabilization approach produced a 67% increase in compressive strength and an 88% reduction in swelling pressure compared with untreated soil. Model tank experiments demonstrated a significant reduction in rainfall-induced erosion and improved load-carrying capacity of the slope.</p>

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Application of biomineral and chemical stabilized soil to moderate the rainfall based slope erosion and to improve the stability of slopes

  • 期刊论文

  • 发表日期：

    2026年6月26日

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  • Janaki Ramudu Dudekula,
  • Sudharani Chigurupati,
  • Venkatesh Noolu

摘要

Rapid infrastructure growth demands competent foundation soils; however, suitable conditions are not always available. Soil stabilization techniques therefore play an important role in improving the engineering behavior of weak soils. In addition to conventional stabilizers, several industrial by-products have been successfully used for sustainable soil improvement. However, chemical stabilizers often have limitations in terms of environmental impact and optimal dosage. Microbially Induced Calcite Precipitation (MICP) provides an environmentally friendly alternative that can be used in combination with chemical stabilization methods. In the present study, expansive soil was stabilized using 10% Ground Granulated Blast Furnace Slag (GGBS) along with biostimulation-induced MICP. The improvement in soil properties was evaluated through unconfined compressive strength tests and consolidation tests to assess changes in swelling pressure and compression index. Microstructural analyses were conducted using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to confirm the stabilization mechanisms. In addition, model tank experiments were performed to evaluate the effectiveness of the stabilized soil in reducing rainfall-induced erosion and improving slope load-carrying capacity. The results show that the combined stabilization approach produced a 67% increase in compressive strength and an 88% reduction in swelling pressure compared with untreated soil. Model tank experiments demonstrated a significant reduction in rainfall-induced erosion and improved load-carrying capacity of the slope.