Method for in situ determination of porous medium permeability and skin effect in underground mines

摘要

method for determining permeability of "in situ" centre in the groundwater and porous skin effect using the probe areometrycznej is suchthat record the times of measurement and the corresponding pressure, calculated dimensionless pressure and pressure bezwymiarowych logarithms.and then in a rectangular coordinate system corresponding to the applied points pomierzonym times and logarytmom decimal pressures bezwymiarowych,which the aproksymuje to straight lines by the method of least squares, separately for short and long times of measurement, the measurement data for short times are considered.as the corresponding parameters zone around the aperture, and the measurement data for long time are considered.as the corresponding parameters on remote batch of porous and on the basis of these straight lines and the coordinate of intersection of line corresponding to long times with the axis.which reference values bezwymiarowego logarithm pressure is calculated permeability zone around the opening k1, k2 centre on permeability of porous located,and skin effect s and the zone? r of altered permeability around the aperture.