Permeability and peculiarities of grounting in tuffaceous foundation rocks of the Araks hydroelectric development
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On the whole, the tuffaceous rocks at the site are only slightly permeable and, therefore, there was no need for a grout curtain to reduce water losses. However, a grout curtain of a control character made it possible to reveal and seal larger joints, especially steeply dipping ones, which were not uncovered in the engineering-geology surveys and could have led to concentrated percolating streams.
The sloping mode of occurrence of the tuffaceous rocks and the presence of weathered and saturated interlayers in the strata led to a highly unproductive consumption of cement. Under such conditions a cautious approach is needed when selecting the injection pressure. Special experiments can establish these allowable pressures which do not cause hydraulic fracturing of the beds and yet ensure successful grouting.
KeywordsPermeability Renewable Energy Source Hydraulic Engineer Hydraulic Fracture Percolate
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