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Geomechanics and Engineering Volume 13, Number 6, December 2017 , pages 1027-1044 DOI: https://doi.org/10.12989/gae.2017.13.6.1027 |
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Analytical solution and experimental study of membrane penetration in triaxial test |
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Enyue Ji, Jungao Zhu, Shengshui Chen and Wei Jin
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| Abstract | ||
| Membrane penetration is the most important factor influencing the measurement of volume change for triaxial consolidated-drained shear test for coarse-grained soil. The effective pressure p, average particle size d50, thickness tm and elastic modulus Em of membrane, contact area between membrane and soil Am as well as the initial void ratio e are the major factors influencing membrane penetration. According to the membrane deformation model given by Kramer and Sivaneswaran, an analytical solution of the membrane penetration considering the initial void ratio is deduced using the energy conservation law. The basic equations from theory of plates and shells and the elastic mechanics are employed during the derivation. To verify the presented solution, isotropic consolidation tests of a coarse-grained soil are performed by using the method of embedding different diameter of iron rods in the triaxial samples, and volume changes due to membrane penetration are obtained. The predictions from presented solution and previous analytical solutions are compared with the test results. It is found that the prediction from presented analytical solution agrees well with the test results. | ||
| Key Words | ||
| membrane penetration; membrane deformation model; isotropic consolidation test; analytical solution | ||
| Address | ||
| Enyue Ji: Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China Jungao Zhu: 1.) Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China 2.) Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing 210029, China Shengshui Chen: Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-Rock Dam of the Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing 210029, China Wei Jin: Chengdu Engineering Corporation Limited, Power China, Chengdu 610072, China | ||