The GPR-method showing high resolution, great performance and sensitivity to minor variations in the composition and conditions of soils and material has assumed a role of the leading geophysical method for looking at the upper part of the geological section. This paper presents the advanced directions of GPR prospecting for engineering problems solution.
The GPR-method showing high resolution, great performance and sensitivity to minor variations in the composition and conditions of soils and material has assumed a role of the leading geophysical method for looking at the upper part of the geological section. This paper presents the advanced directions of GPR application for engineering problems solution.
The saved up experience allows to judge ample opportunities of GPR method for nondestructive control of operational reliability of hydraulic engineering and transport constructions. The GPR method is intended, first of all, for quality standard of a condition of constructions. High sensitivity of this method minor alterations in a structure, structure and a condition of materials of a design of a construction, do its irreplaceable for revealing the defects collecting, external loadings developing and shown under action and causing decrease in durability and bearing ability of designs as a whole. On examples of results of georadar-tracking inspection of concrete fastening of a pressure head slope of a soil dam of the Nizhniy Novgorod hydroelectric power station and a site of the October railway high efficiency of application of a method for revealing and estimations of geometrical parameters of defects of hydraulic engineering constructions and is shown to an earthen embankment of a railway way.
A complex of geophysical and geoelectrochemical methods for diagnostics of corrosion danger of gas pipelines is offered. On the basis of complex geophysical and geoelectrochemical information it is possible to solve the following problems: high-precision determination of the location and depth of the gas pipeline; detection of places and degree of violations of insulating coating of gas pipelines, accompanying metal corrosion damage; evaluation of attenuation factor of variable component of cathodic protection currents; determination of cathodic protection potential in places of gas pipeline insulation damage; identification of corrosion dangerous areas and evaluation of corrosion hazard of pipelines. The relative contrast of geoelectrochemical anomalies characterizes the duration and intensity of corrosion. The suggested methodology complements the existing methods of gas pipelines condition diagnostics. New method was tested at gas pipelines of Lentransgaz enterprise in 1999-2000. According to the results of complex researches the areas of gas pipelines isolation coating violation were marked with indication of places of corrosion damages of pipelines.
