Use of Dilatometer test as an effective tool for the determination of important engineering properties from in-situ tests

The Flat Dilatometer Test (DMT) is an in-situ testing method used to determine the strength and deformation characteristics of fine-grained soils. This method involves a stainless blade shaped probe with a thin circular steel membrane mounted on one side. The blade has a cutting edge to penetrate the soil and is inserted into the ground at the desired depth. It is connected to a control unit on the ground surface. After the penetration, pressure by a gas tank is applied to inflate the membrane. The pressure required to initiate the movement of the membrane against the soil is recorded and is called “A-pressure”. The inflation continues until the center of the membrane is moved 1.1 mm against the soil. The required pressure to achieve that is called “B-pressure”. If the required depth is below the water table, the membrane can be slowly deflated to record “C-pressure”, which represents the pore pressure acting on the membrane. The corrected DMT results are used to obtain information on soil stratigraphy, in situ state of stress, shear strength and deformation properties.



Event Details

DATE: 16th September 2021

Time: 2.00 PM to 3.00 PM IST


Dr.Kaushik Bandyopadhyay, Professor and former head of the Department of Construction Engineering, Jadavpur University, Kolkata.

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