Triaxial compression characteristics and brittleness evaluation of calcareous sand cemented with EICP and coir fiber
Enzyme-induced carbonate precipitation (EICP) technology was used to cement calcareous sand. Consolidated drained triaxial compression tests were conducted to investigate the mechanical properties of EICP-cemented calcareous sand (EICP-S) and EICP-cemented calcareous sand mixed with coir fiber (EICP...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025001781 |
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| Summary: | Enzyme-induced carbonate precipitation (EICP) technology was used to cement calcareous sand. Consolidated drained triaxial compression tests were conducted to investigate the mechanical properties of EICP-cemented calcareous sand (EICP-S) and EICP-cemented calcareous sand mixed with coir fiber (EICP-FS) under varying levels of cementation and confining pressures. Based on the stress-strain curves, a brittleness evaluation index (BEICP) suitable for cemented calcareous sand was developed. The research results indicate: (1) The EICP technique exhibits a pronounced cementation effect on calcareous sand. With the number of grouting operations escalating from 1 to 9, or the confining pressure incrementing from 100 kPa to 300 kPa, the peak deviatoric stress of the cemented mass progressively improves. Furthermore, the EICP-FS specimens display a higher strain at failure and demonstrate a more gradual post-peak stress reduction characteristic. (2) At low cementation levels, coir fiber can effectively enhance the peak deviatoric stress of the samples. However, the enhancement effect diminishes at high cementation levels, and the peak deviatoric stress of the EICP-FS samples can even be lower than that of the EICP-S samples without fiber. (3) At low cementation levels, coir fiber can effectively mitigate the post-peak strength loss of the cemented body. However, this mitigating effect diminishes at high cementation levels. (4) Parameters such as the pre-peak elastic energy ratio, failure strain, maximum post-peak average modulus, peak deviatoric stress, and residual stress of the cemented calcareous sand highly correlate with its brittleness characteristics. The brittleness evaluation index (BEICP) constructed based on these parameters can effectively evaluate its brittleness properties. (5) Under different confining pressures, the BEICP of EICP-FS samples is generally lower than that of EICP-S samples. However, under higher confining pressure conditions, the BEICP values of both types of samples are similar. The research results can provide a theoretical basis for a deeper understanding of the brittleness characteristics of calcareous sand treated with EICP technology and can serve as a reference for brittleness evaluation in related engineering applications. |
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| ISSN: | 2590-1230 |