Abstract
Abstract DMT is one of the most popular methods of determining soil parameters needed to design a safe construction. Apart from the basic outcome parameter obtained from DMT measurements hydraulic conductivity (k) can be determined, previously proposed DMTA and DMTC methods were modified. The basic idea of the method is that the return of the deformed membrane is due to soil and water pressure. In the proposed SASK method the hydraulic conductivity of the soil is determined by measuring time-varying pressures A and C. Research has been performed at the experimental site of the Department of Geotechnical Engineering, WULS. In the paper, the assumptions of the new method for determining the hydraulic conductivity k are presented. The proposed method allows us to determine a reliable value for the hydraulic conductivity of clay soils. Using this method, the value of hydraulic conductivity (k = 5,47*10-11) is similar to the results of BAT, DMTA and laboratory measurements.
Highlights
Probings with Marchetti dilatometer (DMT) along with CPTU are included to standard tests commonly used in the assessment of geotechnical conditions of designed structures [2], [8], [9]
DMT test allows us to determine the standard soil parameters – strength and deformation, and the hydraulic parameters needed for the design of hydraulic structures and for assessment of the environmental impact of buildings
The key parameter in the hydraulic design and environmental assessment of the soil–water conditions is coefficient of permeability k commonly called hydraulic conductivity, for which two methods of determination according to DMT test were proposed: DMTC [10], [4], [5] and DMTA method [7]
Summary
Probings with Marchetti dilatometer (DMT) along with CPTU are included to standard tests commonly used in the assessment of geotechnical conditions of designed structures [2], [8], [9]. DMT test allows us to determine the standard soil parameters – strength and deformation, and the hydraulic parameters needed for the design of hydraulic structures and for assessment of the environmental impact of buildings. The key parameter in the hydraulic design and environmental assessment of the soil–water conditions is coefficient of permeability k commonly called hydraulic conductivity, for which two methods of determination according to DMT test were proposed: DMTC [10], [4], [5] and DMTA method [7]. The value of C is the pressure that occurs during the return of the deformed membrane of 1.1 mm in the direction of the surrounding ground to the plane of the blade (Fig. 1). The proposed method for determining hydraulic permeability assumes that the return to the position of the deformed membrane to plane blade is thrust through the groundwater flowing from the surrounding fully saturated ground.
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