Journal Published Online: 27 July 2018
Volume 41, Issue 5

The Use of the DMT for the Evaluation of Changes in Stress State in Overconsolidated Clay in Geotechnical Applications



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 Information

Peiffer, Herman
Department of Geotechnics, Ghent University, Ghent, Belgium
Malengier, Benny
Department of Materials, Textiles, and Chemical Engineering, Ghent University, Ghent, Belgium
Haegeman, Wim
Department of Geotechnics, Ghent University, Ghent, Belgium
Shen, Hao
Department of Geotechnics, Ghent University, Ghent, Belgium
Pages: 13
Price: $25.00
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Stock #: GTJ20170387
ISSN: 0149-6115
DOI: 10.1520/GTJ20170387