On how to accurately testing compressive strength of soils under low confining pressure

LI Xiaomei; LING Xiaodong; WANG Fang; MI Zhankuan; ZHAN Xinjie

doi:10.11779/CJGE2023S10023

Volume 45 Issue S1

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Chinese Journal of Geotechnical Engineering > 2023 > 45(S1): 148-152. > DOI: 10.11779/CJGE2023S10023

LI Xiaomei, LING Xiaodong, WANG Fang, MI Zhankuan, ZHAN Xinjie. On how to accurately testing compressive strength of soils under low confining pressure[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(S1): 148-152. DOI: 10.11779/CJGE2023S10023

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On how to accurately testing compressive strength of soils under low confining pressure

1.
Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China
2.
College of Overseas Education, Nanjing Tech University, Nanjing 211816, China

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Received Date: July 04, 2023
Available Online: November 23, 2023

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Abstract

Abstract

It is important to study the stress deformation and stability of foundation by accurately testing the strength index of soils. For the triaxial tests under low confining pressures (less than 100 kPa), the influences of the piston friction and the rubber membrane can not be ignored. At the same time, the test accuracy and measuring range of equipments are also the important factors that should be considered. This study attempts to explore the influences of factors such as the piston friction and the rubber membrane on the test results by carrying out unconfined compressive strength tests under different conditions and triaxial consolidated undrained shear tests of different equipments, and to explore how to measure the compressive and shear strengths of samples according to the existing test conditions, so as to provide reliable data for design, construction and numerical calculation. In view of the shortcomings of domestic triaxial test equipments, reasonable suggestions are put forward, and it is expected that the triaxial test equipments should be further transformed and upgraded from mechanical manufacturing so as to promote the researches and development of precise triaxial test equipments in China.
- low confining pressure,
- piston friction,
- rubber membrane,
- measuring range,
- triaxial test

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References

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