Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Geomechanics and Engineering Volume 9, Number 6, December 2015 , pages 743-755 DOI: https://doi.org/10.12989/gae.2015.9.6.743 |
|
|
|
An analytical investigation of soil disturbance due to sampling penetration |
||
Hongguo Diao, Yuedong Wu, Jian Liu and Ruping Luo
|
||
| Abstract | ||
| It is well known that the quality of sample significantly determines the accuracy of soil parameters for laboratory testing. Although sampling disturbance has been studied over the last few decades, the theoretical investigation of soil disturbance due to sampling penetration has been rarely reported. In this paper, an analytical solution for estimating the soil disturbance due to sampling penetration was presented using cavity expansion method. Analytical results in several cases reveal that the soil at different location along the sample centerline experiences distinct phases of strain during the process of sampling penetration. The magnitude of induced strain is dependent on the position of the soil element within the sampler and the sampler geometry expressed as diameter-thickness ratio D/t and length-diameter ratio L/D. Effects of sampler features on soil disturbance were also studied. It is found that the induced maximum strain decreases exponentially with increasing diameter-thickness ratio, indicating that the sampling disturbance will reduce with increasing diameter or decreasing wall thickness of sampler. It is also found that a large length-diameter ratio does not necessarily reduce the disturbance. An optimal length-diameter ratio is suggested for the further design of improved sampler in this study. | ||
| Key Words | ||
| sampling penetration; soil disturbance; cavity expansion; analytical solution; sampler features | ||
| Address | ||
| (1) Hongguo Diao, Yuedong Wu, Ruping Luo: Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; (2) Jian Liu: Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China. | ||