Analýza fyzikálně - mechanických vlastností injektážních směsí určených pro výplň vertikálních kolektorů tepelných čerpadel

Abstract

Grouting mixtures are linked to the proper equipment of boreholes for heat exchangers (BHEs). The mixtures fill the space between the collector tube and the rock massif. Nowadays, when the organizations carrying out drilling work already have enough experience, there are no excesses (completely inadequate injection in the form of backfill material from borehole) which occured, for example, at the beginning of the current millennium. Organizations conscientiously use mixtures with predicted good properties. However, the question remains as to whether the grouting mixtures that are currently available sufficiently meet the requirements. Grouting mixtures undergo research before they are put on the market, which verifies that they achieve the required qualities. At the beginning of boreholes operation, the mixtures therefore have sufficient quality. However, a problem can arise when the mixtures in the boreholes are exposed to various loading factors that cause degradation of the mixture in the long term. It is natural for mixtures to degrade over time. However, it is essential that the degraded mixture still has sufficient quality. The question remains whether today's grouting mixtures can withstand loading factors enough to meet the requirements. As part of the dissertation, samples of two grouting mixtures were analyzed. The name of the mixtures under which these are sold on the market is not given. The reason is simple. The aim of the dissertation research is not to compare the samples of the tested mixtures with each other, but to point out whether the degradation of the mixtures is recorded after the application of different loading factors. If so, then the effect of degradation on the development (decrease) of the values of the tested physical-mechanical properties is interpreted. Although dissertation research brings interesting results, it is necessary to mention that it is purely laboratory research. The reported and interpreted results must therefore be viewed with caution. The grout sector has enormous scientific research potential. If this interesting research at the Department of Geological Engineering continues, it can then be stated that the processed results represent a starting point that can be continually followed up on. In the final, an original recipe of a quality grouting mixture can be created, for example.