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<p>Granite residual soil (GRS) is prone to settlement and instability in foundations, roadbeds, or slopes. Microbial-induced calcium carbonate precipitation (MICP), an emerging environmentally friendly technology, is widely applied in geotechnical improvement. However, the MICP-improved soil exhibits obvious brittle failure. To overcome this limitation, introduced jute fibers. This study systematically investigated the effects of five initial dry densities (1.70–1.90&#xa0;g/cm<sup>3</sup>) and six jute fiber contents (0–0.5%) on the mechanical properties of MICP-cured GRS. Unconfined compressive strength (UCS) tests, scanning electron microscopy (SEM) analysis, and X-ray diffraction (XRD) tests were conducted to verify the feasibility of MICP-fiber composite improvement on GRS. The composite reinforcement greatly improved sample UCS. At 0.5% fiber content, UCS reached 1.62&#xa0;MPa, 2.22 times the unimproved soil (0.73&#xa0;MPa) and 1.23 times the MICP-improved soil (1.33&#xa0;MPa). For the MICP-improved samples with 0.5% fiber content, UCS generally rose with dry density yet declined at 1.85&#xa0;g/cm³ before climbing again at 1.90&#xa0;g/cm³. The soil strength is governed by fiber dispersion and dry density under high fiber content. Besides, adding jute fibers greatly reduced brittle failure, and the ductility index was 2.62 times that of MICP-reinforced specimens. The XRD and SEM results indicated that the calcite precipitates produced by MICP adhere to the surfaces of soil particles and fibers, and filled the pores of the sample to enhance the integrity of the structure. The combined fiber reinforcement and MICP treatment effectively improves the strength and ductility of GRS, showing promising engineering application prospects.</p>

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Enhancing unconfined compressive strength of granite residual soil through synergistic application of microorganisms and jute fibers

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Jiaxin Kang,
  • Wenjing Liang,
  • Hao Peng,
  • Ya Wang,
  • Fang Dang,
  • Yunru Zhang,
  • Hong Guo,
  • Han Bao

摘要

Granite residual soil (GRS) is prone to settlement and instability in foundations, roadbeds, or slopes. Microbial-induced calcium carbonate precipitation (MICP), an emerging environmentally friendly technology, is widely applied in geotechnical improvement. However, the MICP-improved soil exhibits obvious brittle failure. To overcome this limitation, introduced jute fibers. This study systematically investigated the effects of five initial dry densities (1.70–1.90 g/cm3) and six jute fiber contents (0–0.5%) on the mechanical properties of MICP-cured GRS. Unconfined compressive strength (UCS) tests, scanning electron microscopy (SEM) analysis, and X-ray diffraction (XRD) tests were conducted to verify the feasibility of MICP-fiber composite improvement on GRS. The composite reinforcement greatly improved sample UCS. At 0.5% fiber content, UCS reached 1.62 MPa, 2.22 times the unimproved soil (0.73 MPa) and 1.23 times the MICP-improved soil (1.33 MPa). For the MICP-improved samples with 0.5% fiber content, UCS generally rose with dry density yet declined at 1.85 g/cm³ before climbing again at 1.90 g/cm³. The soil strength is governed by fiber dispersion and dry density under high fiber content. Besides, adding jute fibers greatly reduced brittle failure, and the ductility index was 2.62 times that of MICP-reinforced specimens. The XRD and SEM results indicated that the calcite precipitates produced by MICP adhere to the surfaces of soil particles and fibers, and filled the pores of the sample to enhance the integrity of the structure. The combined fiber reinforcement and MICP treatment effectively improves the strength and ductility of GRS, showing promising engineering application prospects.