Szybki sposób określania współczynnika filtracji dla celów geologiczno-inżynierskich

Abstract

QUICK TECHNIQUE IN DETERMINING PERMEABILITY COEFFICIENT FOR ENGINEERING-GEOLOGICAL PURPOSESSummaryAttempts made at solving various engineering-geological problems call also for investigation of changes in permeability coefficient with depth. To this end a new method has been worked out to measure the permeability coefficient using percussion hammer for driving in and out a special piezometer. According to this method, a piezometer, equipped with a filter, is being filled in with water under constant over-pressure. To measure the water yield a special reservoir has been constructed.To calculate the permeability coefficient the Kozlav's formula has been applied, and the values calculated have been corrected to avoid the influence of discontinuity on filter. To this end the experimental Abramov's formula has been used.Analysed is also the influence of the consolidation of milieu – which arises when the piezometer being driven in – upon the measurement of the coefficient considered.To prove the method here considered the results of the measurements have been compared with those of test pumping and bailing. The results obtained during the method of infilling with water, with or without regard to the jump on filter, are approximate to those of test pumping, calculated on the basis of the measurements made in a single well.Moreover, investigated is the dependence of the permeability coefficient upon both the filter length and the over-pressure value during the infilling with water.