Apparatus and method for measuring salinity of interstitial water collected from soil sample

An apparatus for measuring salinity of interstitial water in a soil sample, comprising:

• an air supplier that generates a stream of high-pressure air;
• an air nozzle from which the high-pressure air, supplied from the air supplier, is ejected;
• a soil-compressing tank into which the high-pressure air, ejected from the air nozzle, is introduced and that compresses a soil sample disposed in a gap formed between an upper filter assembly and a lower filter assembly, producing interstitial water;
• and
• a water tank in which the interstitial water, drained from the soil-compressing tank, is collected and in which a salinity-measuring sensor for measuring salinity of the interstitial water is installed,
• wherein,
• a middle portion of the soil sample is pushed by the high-pressure air introduced into the soil-compressing tank connected to the air nozzle, creating a fault line in the soil sample, and shear stress applied to the soil sample is measured by a load cell installed on one side of the lower filter assembly.

An apparatus for measuring salinity of interstitial water in a soil sample, comprising:

• an air supplier that generates a stream of high-pressure air;
• an air nozzle from which the high-pressure air, supplied from the air supplier, is ejected;
• a soil-compressing tank into which the high-pressure air, ejected from the air nozzle, is introduced and that compresses a soil sample disposed in a gap formed between an upper filter assembly equipped with a gauge and a lower filter assembly, producing interstitial water;
• and
• a water tank in which the interstitial water, drained from the soil-compressing tank, is collected and in which a salinity-measuring sensor for measuring salinity of the interstitial water is installed,
• wherein,
• a distance between a wall of the soil-compressing tank and the soil sample increases with time due to the high-pressure air introduced into the soil-compressing tank connected to the air nozzle and the distance is measured by the gauge to determine consolidation of the soil sample.

A method for measuring salinity of interstitial water in a soil sample, comprising:

• removing an upper filter assembly from a soil-compressing tank;
• putting a predetermined amount of collected soil sample into the soil-compressing tank from which the upper filter assembly is removed;
• stacking and pressing the upper filer assembly on and against an upper surface of the soil sample;
• starting operation of an air supplier;
• introducing high-pressure air to the soil-compressing tank through an air nozzle in a state in which the upper filter assembly is stacked on and pressed against the soil sample;
• squeezing interstitial water contained in the soil sample using a pressure of the high-pressure air and draining the interstitial water;
• collecting the drained interstitial water in a water tank;
• measuring salinity of the interstitial water stored in the water tank using a salinity-measuring sensor after collection of the interstitial water is completed;
• and
• processing data of the measured salinity of the collected interstitial water stored in the water tank.