Doymamış Kumlarda Toprağın Suyu Tutma Eğrisi Tayini, Karşılaştırmalı Çalışma - Asılı Kolon Tekniğine Karşı Filtre Yöntemi

Abstract

Soil water retention characteristic is the key soil property used in many applications in the fields of irrigation, hydrology, geotechnical engineering and soil science in general and there are different methods used to obtain SWRC. Filter paper method and Hanging column test methods are two of them. The use of filter paper method for sands is quite limited in the literature in which only a number of studies have been conducted using this method. This study, therefore, aims to use the filter paper method for measuring matric suction for two different types of sands. Samples were prepared using the water pluviation technique. The samples were left to dry out and then monitored by weight to obtain different values of degree of saturation. This is to extend suction measurement beyond the residual suction and to fully define the shape of the soil water retention curve. The filter paper method then was validated with the hanging column technique, which is a method of controlling and applying suction. The obtained results are presented in order to highlight the differences / similarities between the methods and the advantages / disadvantages of each one. Although the FP is an indirect method of measuring suction in unsaturated soils, it has not been utilized broadly for fine-grained unsaturated sands. The use of the filter paper method for unsaturated fine sands is quite limited in the literature in which only a number of studies can be found using the filter paper method for unsaturated sands. Therefore, this paper provides an insight on the use of filter method for unsaturated fine sands. Testing two sand soil with different particle size distribution showed that Soil 1 is better than Soil 2 to be used for FP method. And this result is a good show for the range of utilization of FP method in fine sand soil.