Abstract
Biocement as an alternative to cement for soil improvement has been studied for the past decade. A comparative study on the cementation effect on the mechanical behavior of sand by biocement and Portland cement is presented. Drained triaxial tests were carried out on both cement- and biocement-treated sand. The yielding of cemented sand is largely associated with the breakage of bonding. Bonding ratio is defined in this paper to quantify the bonding effect. The bonding provided by biocement is stronger than that by cement, and as a result, the stress ratio at yielding for biocement-treated sand is higher than that for cement-treated sand given the other conditions the same. The shear resistance of cemented sand consists of bonding, dilation and friction. The stress–dilatancy relationship of biocement-treated sand is different from that of cement-treated sand or the Rowe’s stress–dilatancy equation. The increase in stress ratio with dilatancy ratio (1 − δεv/δε1) is higher for biocement-treated sand.
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Abbreviations
- A*:
-
Parameter of the power function y = A*•(1 + x)B*
- B*:
-
Parameter of the power function y = A*•(1 + x)B*
- bc :
-
Biocement content
- bc ave :
-
Average biocement content for each group of bifocement-treated specimens
- cc :
-
Cement content
- cc ave :
-
Average cement content for each group of biocement-treated specimens
- D 50 :
-
Mean grain size (mm)
- d :
-
Dilatancy ratio (− δεpv/δεps)
- e s :
-
Intergranular void ratio
- e s,c :
-
Intergranular void ratio after consolidation
- M :
-
Effective stress ratio at critical state
- M μ :
-
Effective stress ratio corresponding to interparticle friction angle
- p′ :
-
Mean effective stress (kPa)
- q :
-
Deviatoric stress (kPa)
- v v :
-
Volume of voids
- v c :
-
Volume of cement (or biocement)
- v s :
-
Volume of sand particles
- ΔW :
-
Total work
- ΔW fric :
-
Energy dissipated by frictional loss
- ΔW bond :
-
Energy dissipated by bonding breakage
- δε a :
-
Incremental axial strain
- δε 1 :
-
Major principal total strain increment
- δε 3 :
-
Minor principal total strain increment
- δε v :
-
Incremental total volumetric strain
- δε s :
-
Incremental total shear strain
- δε p p :
-
Incremental plastic volumetric strain
- δε p s :
-
Incremental plastic shear strain
- φ f :
-
Friction angle during shearing
- φ cs :
-
Friction angle of critical state
- φ μ :
-
Interparticle friction angle
- δq :
-
Incremental deviatoric stress (kPa)
- σ 1 ′ :
-
Major principal effective stress (kPa)
- σ 3 ′ :
-
Minor principal effective stress/effective confining pressure (kPa)
- (σ 1 ′/σ 3 ′)p :
-
Stress ratio at peak point
- (σ 1 ′/σ 3 ′)r :
-
Residual stress ratio
- (σ 1 ′/σ 3 ′)y :
-
Stress ratio at yielding point
- η :
-
Stress ratio (q/p′)
- η bond :
-
Bonding ratio (ΔWbond/p′δεps)
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Acknowledgements
We would like to acknowledge gratefully that the work presented in this paper is partially supported by the Ministry of Education (MOE2015-T2-2-142) and by Nanyang Technological University (NTU) for providing the scholarship to the first author and the support to Centre for Urban Solutions at NTU.
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Wang, L., Chu, J., Wu, S. et al. Stress–dilatancy behavior of cemented sand: comparison between bonding provided by cement and biocement. Acta Geotech. 16, 1441–1456 (2021). https://doi.org/10.1007/s11440-021-01146-4
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DOI: https://doi.org/10.1007/s11440-021-01146-4