Preguntas sobre succion en suelos

1. Which is the principle of the operation of the tensiometer?
A tensiometer consists of a small bore tube which is saturated with water. Water pressure in the tensiometer comes into equilibriumwith the pore-water pressure in the soil through a high-air entry ceramic cup. A vacuum gauge or a pressure transducer is connected to the tensiometer for measuring the equilibrium water pressure.Cavitations of water in the tensiometer tube at water pressures less than 90 kPa results in the maximum matric suction that can be effectively measured is 90 kPa.
2. What happened if the tensiometer isnot saturated?
If the tensiometer its not saturated we are going to measure the negative pressure.
3. Which is the range of measurements of tensiometer?
The range of measurement of the tensiometeris from 0 to 100 kPa.
4. Which is the range of the axis translation apparatus?
The range of the axis translation apparatus is from 100kPa to 1MPa.
5. Which are the components of the mini suctionprobe?
The mini suction probe has a plastic tube, a steel tube, a glass ring, a diaphragm, a ceramic disk and wires.
6. Which is the time of response of the mini probe?
Less than 3 seconds.
7.Which measures the filter paper suction that is in contact with the ground and why?
Matric suction is measured because a filter paper that is in contact with the soil specimen allows water in theliquid phase and solutes to exchange freely.
8. Which is the recommended time for the equilibration of the filter paper?
Its depends if the paper its in contact from 2-5 days and if the paper its notin contact then is from 2-14 days.
9. Which are the most commonly used filter papers?
The most commonly used filter papers for suction measurement are Whatman No.42 and Schleider &Schuell (S&S) No.589-WH.
10. Why the thermal sensor it has to be calibrated for each soil?
Because different soils have a different thermal conductivity, Johnston used plaster of Paris to encase the heating and...