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The use of the DMT for the evaluation of changes in stress state in overconsolidated clay in geotechnical applications

Herman Peiffer (UGent) , Benny Malengier (UGent) , Wim Haegeman (UGent) and Hao Shen (UGent)
(2018) GEOTECHNICAL TESTING JOURNAL. 41(5). p.902-914
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Abstract
This article concerns the experimental evaluation of changes in the stress state in overconsolidated clay for two geotechnical applications: pile installation and slope stability. The first topic focuses on the experimental evaluation of change in the stress state that is due to pile installation, especially on the measurements before and after pile installation. The procedure was carried out for the evaluation of the effect of the installation of auger cast in place piles in overconsolidated clay. The results show the problem of predicting the shaft capacity in a new light. They contradict simplified prediction models for evaluating the influenced zone and the magnitude of the soil stress changes. For the second topic, it is described how the dilatometer test (DMT) can be used to evaluate the stability of slopes, to determine the risk of instability, and how the cause of the failure can be directly related to the DMT measurement. The description involves discussing the results of tests before the period of instability, during the period of instability, and after stabilization, using the KD value (KD = horizontal stress index) as a representative value to assess the risk of instability.
Keywords
slope stability, dilatometer, pile installation, soil stresses, overconsolidated clay

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Chicago
Peiffer, Herman, Benny Malengier, Wim Haegeman, and Hao Shen. 2018. “The Use of the DMT for the Evaluation of Changes in Stress State in Overconsolidated Clay in Geotechnical Applications.” Geotechnical Testing Journal 41 (5): 902–914.
APA
Peiffer, Herman, Malengier, B., Haegeman, W., & Shen, H. (2018). The use of the DMT for the evaluation of changes in stress state in overconsolidated clay in geotechnical applications. GEOTECHNICAL TESTING JOURNAL, 41(5), 902–914.
Vancouver
1.
Peiffer H, Malengier B, Haegeman W, Shen H. The use of the DMT for the evaluation of changes in stress state in overconsolidated clay in geotechnical applications. GEOTECHNICAL TESTING JOURNAL. 2018;41(5):902–14.
MLA
Peiffer, Herman, Benny Malengier, Wim Haegeman, et al. “The Use of the DMT for the Evaluation of Changes in Stress State in Overconsolidated Clay in Geotechnical Applications.” GEOTECHNICAL TESTING JOURNAL 41.5 (2018): 902–914. Print.
@article{8573740,
  abstract     = {This article concerns the experimental evaluation of changes in the stress state in
overconsolidated clay for two geotechnical applications: pile installation and slope stability. The
first topic focuses on the experimental evaluation of change in the stress state that is due to pile
installation, especially on the measurements before and after pile installation. The procedure was
carried out for the evaluation of the effect of the installation of auger cast in place piles in
overconsolidated clay. The results show the problem of predicting the shaft capacity in a new
light. They contradict simplified prediction models for evaluating the influenced zone and the
magnitude of the soil stress changes. For the second topic, it is described how the dilatometer test
(DMT) can be used to evaluate the stability of slopes, to determine the risk of instability, and
how the cause of the failure can be directly related to the DMT measurement. The description
involves discussing the results of tests before the period of instability, during the period of
instability, and after stabilization, using the KD value (KD = horizontal stress index) as a
representative value to assess the risk of instability.},
  author       = {Peiffer, Herman and Malengier, Benny and Haegeman, Wim and Shen, Hao},
  issn         = {0149-6115 },
  journal      = {GEOTECHNICAL TESTING JOURNAL},
  keywords     = {slope stability,dilatometer,pile installation,soil stresses,overconsolidated clay},
  language     = {eng},
  number       = {5},
  pages        = {902--914},
  title        = {The use of the DMT for the evaluation of changes in stress state in overconsolidated clay in geotechnical applications},
  url          = {http://dx.doi.org/10.1520/GTJ20170387},
  volume       = {41},
  year         = {2018},
}

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