Determining method of cohesionless soil state parameter based on resistivity CPTU and liquefaction evaluation

DUAN Wei; CAI Guo-jun; LIU Song-yu; ZOU Hai-feng; CHU Ya

doi:10.19818/j.cnki.1671-1637.2019.02.006

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DUAN Wei, CAI Guo-jun, LIU Song-yu, ZOU Hai-feng, CHU Ya. Determining method of cohesionless soil state parameter based on resistivity CPTU and liquefaction evaluation[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 59-68. doi: 10.19818/j.cnki.1671-1637.2019.02.006

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DUAN Wei, CAI Guo-jun, LIU Song-yu, ZOU Hai-feng, CHU Ya. Determining method of cohesionless soil state parameter based on resistivity CPTU and liquefaction evaluation[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 59-68. doi: 10.19818/j.cnki.1671-1637.2019.02.006

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Determining method of cohesionless soil state parameter based on resistivity CPTU and liquefaction evaluation

doi: 10.19818/j.cnki.1671-1637.2019.02.006

School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China

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Author Bio:
DUAN Wei (1989-), male, doctoral student, zbdxdw@163.com

CAI Guo-jun (1977-), male, professor, PhD, focuscai@163.com
Received Date: 2018-09-03
Publish Date: 2019-04-25

Abstract

Abstract

In order to study a new method for evaluating the state parameter based on in-situ testing technology, the Suqian-Xinyi Expressway project was taken as the background, the in-situ test of saturated cohesionless soil was conducted by using the resistivity piezocone penetration test (CPTU). By referring to the mean values of the existing in-situ state parameter calculation methods in the literatures, the state parameter calculation method was established by combining the resistivity and soil behavior type index. The state parameter evaluated by the method was applied to the liquefaction evaluation. Analysis result shows that the state parameter is proportional to the soil behavior type index, while the soil behavior type index is inversely proportional to the resistivity and can be used as one of the effective indexes to connect the state and electrical properties of cohesionless soil. The trend of state parameter evaluated by the proposed calculation method of resistivity CPTU state parameters is in agreement with the values of the existing methods. The proposed resistivity CPTU method is mainly applicable to the silt and silty sand whose behavior type indexes are between 1.8 and 2.6. The in-situ state parameter of cohesionless soil calculated by the proposed method has good linear relationships with the relative density, the trend is opposite, and it can be used as an effective alternative parameter for the commonly used index of relative density to evaluate the compactness of soil. The liquefaction resistance ratio of cohesionless soil calculated based on the state parameter from the proposed method is basically consistent with the values of international general methods. It is concluded that the silty sand layer below 8 m is liquefaction layer, which is consistent with the standard penetration test results. The state parameter can be effectively used for the reliable discrimination of liquefaction potential.
- geotechnical engineering,
- cohesionless soil,
- state parameter,
- resistivity piezocone penetration test,
- relative density,
- liquefaction

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References(32)

References

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Determining method of cohesionless soil state parameter based on resistivity CPTU and liquefaction evaluation

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