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Volume 38 Issue 6
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MING Jing-ping, SUN Zhen-yuan. Experimental study on deformation of soil under vacuum unloading[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(6): 1081-1086. DOI: 10.11779/CJGE201606015
Citation: MING Jing-ping, SUN Zhen-yuan. Experimental study on deformation of soil under vacuum unloading[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(6): 1081-1086. DOI: 10.11779/CJGE201606015
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Experimental study on deformation of soil under vacuum unloading

  • Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China

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  • Received Date: March 15, 2015
  • Published Date: June 24, 2016
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    • Abstract
  • In order to study the deformation characteristics of soil under vacuum preloading when unloading vacuum pressure, compression-redound tests on undisturbed soft clay samples are performed to simulate different vacuum unloading case by normal using the triaxial apparatus and CKC triaxial apparatus. The test results indicate that the deformation caused by vacuum unloading includes elastic volumetric swelling and considerable shear deformation under high deviatoric stress level, and the vacuum unloading can induce the shear failure of ground when the deviatoric stress is high enough, especially in vacuum-surcharge preloading. So, both the volumetric swelling and the shear deformation should be considered in settlement analyzsis of vacuum preloading ground.
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