Method of and arrangement for determining geohydraulic permeability of ground regions through which ground water flows
AssigneeIEG Industrie-Engineering GmbH
InventorBruno Bernhardt
Life of this patent
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Abstract
A measurement of geohydraulic permeability of ground regions is performed by producing a negative pressure in a well shaft and a measuring of the resulting raise or lowering of the ground water level in the well shaft without pumping out of ground water from the shaft.
Claims18
A method of determining geohydraulic permeability of ground regions through which ground water flows for dimensioning of a well providing ground water circulation, the method comprising the steps of producing a negative pressure of an adjustable magnitude above a ground water level in a well shaft in a ground region to be investigated;
- measuring a raise of the water level produced by the negative pressure in the well shaft per unit time and also measuring at least one of the negative pressure acting in the well shaft and lowering of the ground water level per unit time after elimination of the negative pressure to obtain respective measuring values;
- and determining a geohydraulic permeability of the ground level to be investigated from the obtained measuring values.
An arrangement for determining geohydraulic permeability of ground regions through which ground water flows for dimensioning wells for producing a ground water circulation, the arrangement comprising a locally water permeable shaft wall defining a well shaft which is air- and water-impermeably closed above a ground water level;
- means for producing a negative pressure in the well shaft above the ground water level in the shaft;
- and a measuring probe for measuring a change of the ground water level produced by the negative pressure per unit time in the well shaft and also for measuring the negative pressure acting in the well shaft to obtain respective measuring values so as to determine the geohydraulic permeability from the obtained measuring values.
An arrangement for determining geohydraulic permeability of ground regions through which ground water flows for dimensioning wells for producing a ground water circulation, the arrangement comprising a locally water permeable shaft wall which defines a well shaft, which is air-and water-impermeably closed above a ground water level;
- means for producing a negative pressure in the well shaft;
- and a measuring probe for measuring change of the ground water level per unit time and the negative pressure acting in the shaft so as to determine the geohydraulic permeability from thusly measured values, said well shaft being formed by three concentric tubes including a central tube provided having a lower end provided with a cutting tool and an upper end connectable with a rotary drive, an inner tube which together with a bore core is removable from said central tube and an outer tube.
Dependencies are inferred from the claim text.