Abstract
There are many methods to measure the suction and saturation point of any soil and the most used is Tensiometer. The objective of this research is to investigate a new trend to measure the saturation point and suction by using soil moisture content sensors (SMCS) and compare the procedure with tensiometer for the granular soil. The soil in this study has been prepared at three relative densities (5%, 35% and 75%) used. The results show that the readings of SMCS become stable when the water content is more than 20% with different relative densities. The relative density did not affect the SMCS reading when approximately reaching the saturation point.
Highlights
The modeling attitude of an unsaturated soil requires measurement of suction in the soil and their difference with water content, which it is known as the soil-water-characteristic-curve (SWCC)
While Figure (8) illustrates the water content and soil moisture content sensors (SMCS) readings for sample prepared at the same relative density
Figure (9) illustrates the water content and tensiometer readings for sample prepared at R.D 75%, while Figure (10) illustrates the water content and SMCS readings for sample prepared at the same relative density
Summary
The modeling attitude of an unsaturated soil requires measurement of suction in the soil and their difference with water content, which it is known as the soil-water-characteristic-curve (SWCC). The matric suction in unsaturated soil is calculated directly by measuring the reflecting of the pore water pressure, [5]. When the high_air_entry material is saturated with water, the surface tension maintained at the gas-liquid interfaces formed in the material’s pores allows a pressure difference to be sustained between gas and liquid phases located on either side. Three soils from different sites from Baghdad were used in there study and Nacl salt was used to mix with soil They concluded that with increase of filter paper moisture content there is a linear decrease in both total and matric suctions. The main objective of this research is to investigate a new trend to measure suction and determine the saturation point by using soil moisture content sensor (SMCS)
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