RADAR DETERMINATION OF GROUNDS AND GROUNDWATER

Contact: B.Kazarin
Laboratory "Bridges and engineering installations"
Tel.: (+375 17) 2029667, 2029769


Belarusian National Technical University
Address: 65, Nezalejnastsi ave., 220013,
Minsk, Republic of Belarus

 

Purpose: 

There was developed and tested a way of radiolocation observation of grounds, including method of geo-radar measurements, processing method of radiolocation signals and method of interpretation of the processing results. The processing method of radiolocation signals provide for usage of the main physical properties of the grounds.

Area of application:

  • detection of characteristics of the ground stratifications, levels of groundwater and directions of their flows.
  • determination of availability of foreign inclusions, cavities and old footings in the ground medium.
  • determination of the man-caused zones of groundwater pollutions.
  • more precise definition of exploration places assignment for boreholes and examination places with help of probing.

    • Advantages:

  • possibility of definition of position data and recognition of physical properties of the grounds and groundwater for compact urban planning and absence of data about underground communications.
  • efficiency of information receiving on the ground properties.
  • reliability of the received information on the ground properties

    • Technical characteristics:

  • depth of the radiolocation observation: in the sand - up to 40-45 meter, in the clay soils and stratified medium - up to 30-35 meter.
  • Ğallowable sizes of volume recognized by the geo-radar are up to 30x30x30 sm.
  • research results are represented as two- and three-dimensional color radiolocation pictures of density, humidity and type of a ground.

    •  

Implementation:




Breakdown wall of circular pumping station.

The collapse of some sections of the wall has taken place because of temporary break off a work of the drainage system.



On the figure it can be noticed, that the depth of the placement of the base of footing is up to 4 meter, and the ground is friable. The project depth of the base of footing is 9 meter.
 

Under construction line of the underground station.

The cost of the drilling work in the station trench of the underground has increased, and terms of the building end have became unforeseen because of the presence of the boulders in the ground.





The two-dimensional radiolocation figure of the ground density near one of the routes on the trench bottom. There are noticed clearly some boulders of up to 0,5 meter and groups of boulders of length about 3-4 meter.

 

Car park

The ground depressions are up to 2,5 meter. The radiolocation images have made able to notice waterproof layers, decompressed places of ground and air holes in them, system of drain wells and remains of the buildings taken down, as well as places of the waterlogged ground. 
On the radiolocation two-dimensional picture of the relative humidity of ground is shown availability of filtration flows on 3 and 6 meter of depth (dark color).



 

Control of the grounds on railway embankment.

  The piece of the railway with slump of ties and railing construction.




 

 

 

The main reason for subsidence is cavity with depth up to 1 meter and considerable sizes of the area of a very friable ground. In the center of lower part of the figure is shown the drainage pipe.




 


The two-dimensional radiolocation picture of the ground density of the control piece of an embankment. Availability in the embankment of railway of dense ground layers (artificial filling).
 
For additional information please contact us at:
phone: (+ 375 17) 2928342
fax: (+375 17) 2327183
e-mail:		 Ministry of Education for the Republic of Belarus