Temperature Effects on Soil Suction for Compacted Clay Soils

Abstract

An investigation was conducted to determine the effects of temperature, compaction water content, and compaction efforts on soil suction of two expansive subgrade soils. For this purpose, two expansive soils were statically compacted at target water contents ranging from 5% to 20%. This made it possible to explore a broad spectrum of compaction conditions. Filter paper method and thermocouple psychrometer were used to measure soil suction at temperatures ranging from 10°C to 60°C. Experimental results show that compaction water content, compaction effort, and temperature have influences on soil suction. As water content increases, the influences of compaction effort and temperature on suction become less significant. Finally multiple regression formulations for predicting the soil suction of as-compacted clayey soil were established.

Water Evaporation and Soil Suction Measurements of Different Soil Types in Jordan

“…It is an indirect method and is widely used because of its simple setup, procedure, and data analysis. [4] adopted the thermocouple psychrometer as well as the filter paper method for determining soil suction. As per their outcomes, the filter paper method turned out to be reliable for soil suction measurements as long as the method was properly conducted.…”

“…It's important to determine the soil evaporation rates to, say, design soil cover systems for the long-term closure of hazardous-waste sites, to model the saturated and unsaturated groundwater flow, and to predict heave for shallow foundations on expansive soils. Many engineering-related problems are associated with partly saturated soils in which water and air fill the voids between particles, resulting in a negative-pore water pressure or soil suction, which is defined as the potential with which a given soil absorbs and retains pore water at given moisture contents [4]. At low moisture contents, soil suction becomes more difficult since the coefficient of permeability of the unsaturated soil can become extremely low [4].…”

“…Many engineering-related problems are associated with partly saturated soils in which water and air fill the voids between particles, resulting in a negative-pore water pressure or soil suction, which is defined as the potential with which a given soil absorbs and retains pore water at given moisture contents [4]. At low moisture contents, soil suction becomes more difficult since the coefficient of permeability of the unsaturated soil can become extremely low [4]. In engineering practice, soil suction is composed of two components, namely Matric and Osmotic suction, whose sum is called Total suction [5].…”

“…Barbour, S. L. [2] found that when the amount of water in soil decrease, the salt concentration increase resulting in an increase in Osmotic suction. Soil water characteristic curve (SWCC) labels the linkage between soil suction and moisture content in unsaturated soils, and it is also vital for learning the physical behavior of unsaturated soils [4].…”