Investigation on the Triaxial Mechanical Characteristics of Cement-Treated Subgrade Soil Admixed with Polypropylene Fiber
| Autor: | Zhou Hang, Wei Wang, Na Li, Li Yuan, Yong Liu, Jia Guo, Chen Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
0211 other engineering and technologies failure angle 02 engineering and technology mechanical properties Triaxial shear test lcsh:Technology lcsh:Chemistry Stress (mechanics) Brittleness Residual stress 021105 building & construction Cohesion (geology) General Materials Science Fiber Composite material lcsh:QH301-705.5 Instrumentation triaxial test brittleness index 021101 geological & geomatics engineering Fluid Flow and Transfer Processes lcsh:T Process Chemistry and Technology General Engineering Subgrade Overburden pressure lcsh:QC1-999 Computer Science Applications fiber-cement-treated subgrade soil lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences Volume 9 Issue 21 Applied Sciences, Vol 9, Iss 21, p 4557 (2019) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app9214557 |
| Popis: | In order to evaluate the improvement effect of fiber on the brittle failure of cement-treated subgrade soil, a series of triaxial unconsolidated undrained (UU) tests were carried out on samples of polypropylene fiber-cement-treated subgrade soil (PCS) with polypropylene fiber mass content of 0&permil 2&permil 4&permil 6&permil and 10&permil The results showed that, (1) the deviatoric stress-axial strain curve of PCS samples were all strain-softening curves. (2) For the same fiber mass content, the peak stress, residual stress, and strain at peak stress of PCS samples gradually increases with the increase in the confining pressure, while their brittleness index gradually decreases. (3) With the increase in confining pressure, compared with that of the 0&permil PCS sample, the increase in peak stress, residual stress, and strain at peak stress of 6&permil PCS sample were in the ranges of 24%&ndash 29%, 87%&ndash 110%, and 85%&ndash 120%, respectively. The decrease in the brittleness index and failure angle was 52%&ndash 79% and 16%, while the cohesion and internal friction angle increased by 25.9% and 7.4%, respectively. The results of this study indicate that it is feasible to modify cement subgrade soil with an appropriate amount of polypropylene fiber to mitigate its brittle failure. |
| Databáze: | OpenAIRE |
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