Research of the technogenic fixed grounds of the bottom of foundations by radar and seismic methods in conditions of the long-term used object of the cultural heritage

Abstract

The relevance of the research is determined by the growing demands to using volumetric geophysical methods of non/destroyed control for diagnostic of foundation bottom grounds fixed by special cementing works where the mandatory attribute is a geophysical control of the quality of strengthening in addition to the discrete measurements on samples taken in special pits and wells. The aim of the research: 1) analysis of physic/geological and technical situation on the research object with subsequent composing of physic/geological and physic/technical models for choosing the complex of modern geophysical non/destructive control technologies and methods of measurement results processing by using specialized processing complexes; 2) research of condition of technogenic fixed grounds of foundation bottom by GPR/radar and seismic methods in conditions of the long/term used object of the cultural heritage of the regional importance «Memorial building B. Dom Alfuzova», 1880, Taganrog. Methods of research: 1) GPR/radar survey inside and outside the building by parallel profiles laid along the walls on distance of 2,5 m from each other; 2) seismic survey by the methods: a) longitudinal profiling with many/point system of observations; b) seismo/translucency by the scheme of surface-basement with step between fluctuation receiving points 1 m and record of seismograms with the time of registration 256 ms, sampling frequency 4000 Gz and the evolvent 100 ms. Results. The authors have implemented the specific example of setting and resolving the tasks of the quality control of the grouting of foundation bottom using geophysical methods in conditions of long/term exploitation of buildings and structures, and namely: 1) the zone of grouting by Q/factor index on depth and as you move away from the faces of the foundation was determine by the GPR/radar survey; 2) the data on the: a) degree of grouting (K), right next to the foundation and as you move away from it at distance to 5 m; b) deformation module (Edef) of grounds near the side edges of foundation and away from them at distance to 5 m; v) distribution speed of the elastic waves into the grouting at horizontal section under foundation bottom, were obtained by seismic works. The results of research were analyzed on improvement of the complex of shallow depth geophysical methods. For this purpose the authors carried out the short review of domestic and foreign publications by shallow depth geophysics at building and archeological objects