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, The installation and preparation of the cell for the following phase is here described. The soil sample should be installed in a way that good contact is guaranteed with the porous stone at the bottom. 1. Remove excess water from the chamber. The level should be maintained low but water is
, Zero all the readings
, Remove the screws of the upper box and then remove the metallic strips
, Zero the horizontal load cell
, The suction is measured using axis translation technique by applying an air pressure higher than the suction in the sample. The water pressure is measured and so the suction is the difference between the applied cell pressure (air) and the
, Add air pressure up to 100 kPa in steps of 10 kPa
, Use suggestive names for the files and phases, vol.22
, Vertical tram-no control
, Start value-100kPa ii. End value-100kPa iii
, Phase 2: Application of water pressure The water pressure is applied in the sample in order to be able to maintain a constant suction during the consolidation and shear
, Current control-10 s c. Pump-use a very high value so that the pump is not activated
, Apply water pressure of the same value of the previously measured one by increments of 10 kPa
, Vertical tram-no control
, Start value-assigned value of water pressure ii. End value-assigned value of water pressure iii
, Start value-100kPa ii. End value-100kPa iii. Rate-3kPa
, Remove the long screw on the vertical load and replace it by a tap. 2. Stop the control
, Increase the pressure in the vertical tram in steps of 50kPa until an increase in the pressure in the pipe is felt
, The pipe is connected to the vertical tram and pressure is increased in steps of 10kPa until the movement of the piston initiates
, Start value-the initial measured value plus the value of air pressure in the cell ii. End value-the consolidation stress value plus the value of air pressure in the cell iii
, Start value-100kPa ii. End value-100kPa iii. Rate-3kPa
, Start value-the consolidation stress value plus the value of air pressure in the cell
, Start value-100kPa ii. End value-100kPa iii. Rate-3kPa
, Close the horizontal tram
, Close water pressure
, Decrease the pressure of the vertical tram in steps of-30 kPa
, Add the long screw to the vertical tram to hold the vertical loading cell. 9. Decrease all the pressures
, Box 9 and two text files with the depth and respective RAR of each diameter class. Box 7-MATLAB function to calculate the roots tensile strength of Castanea sativa
,