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In the Geotechnical laboratory, experiments in the soil mechanics course content of the Civil Engineering undergraduate program are carried out. In addition, it is open to Gebze Technical University students for many experimental master's and doctoral theses. The Geotechnical Laboratory, which has an area of 150 m², allows classes to be held with groups of 25 students.
The equipment in the laboratory is in accordance with ASTM requirements. Many tests such as sieve analysis, hydrometer test, liquid and plastic limit tests, constant and falling head permeability tests, proctor tests, CBR test, consolidation test can be performed here. Information about the tests is provided below.
(Gebze Technical University Civil Engineering Geotechnical Laboratory) Location: https://maps.app.goo.gl/63eowDtbTXNJdzbf9
Available Materials and Experimental Equipments
1. Hand Operated Auger Boring Set
The Hand operated auger boring set allows manual sampling of up to 5 meters from the field. The materials in the set are shown in Figure 1.
Figure 1. Hand Operated Auger Boring Set
Hand Operated Auger Boring Set consists of a T-Handle with 1 m Rod, 1 m Extension Rod, 80 mm, 100 mm and 150 mm diameter Auger Heads.
2. Sieve Analysis
Sieve analysis test is performed to determine the grain size distribution in soils. The soil material is passed through a series of standard sieves with different opening values and the test is performed. The amount of material remaining on each sieve is measured and the grain size distribution graph of the soil is drawn. The sieves available in our laboratory are presented in Table 1 and Figure 2.
Table 1. Testing Sieves
Figure 2. Soil Mechanics Sieves
3. Hydrometer Test
The hydrometer test is a test used to experimentally determine the grain size distribution of fine-grained soils (silts and clays). This test uses Stoke's law, which shows that the sedimentation rate of spherical solids in a suspension varies depending on their grain size. The materials of hydrometer test set are shown in Figure 3.
Figure 3. Hydrometer Test Set
The following materials are included in the Hydrometer Test Set;
4. Plastic Limit Test Set
This test is perform to find the plastic limit value of the soil. The test equipment are shown in Figure 4.
Figure 4. Plastic Limit Test Equipments
The following equipment is included in this set:
5. Liquid Limit Test
The water content at which the soil changes from a plastic consistency to a viscous liquid consistency is called the liquid limit. In order to find this value, a liquid limit test is performed. The test equipment is shown in Figure 5.
Figure 5. Liquid Limit Test Equipments
6. Permeability Tests
The tests performed to calculate the hydraulic conductivity (coefficient of permeability) in soils are the constant head permeability test and the falling head permeability test.
6.1. Constant Head Permeability Test
The equipment for the constant head permeability test performed to calculate the coefficient of permeability (k) of coarse-grained soils is shown in Figure 6.
6.2. Falling Head Permeability Test
The equipment for the falling head permeability test performed to calculate the coefficient of permeability (k) of fine-grained soils is shown in Figure 6.
Figure 6. Constant and Falling Head Permeability Test Equipments
7. Proctor Tests
The importance of the effect of the water content of soil on compaction properties is known. For this reason, the optimum water content value must be determined by laboratory tests. For this purpose, Standard Proctor and Modified Proctor tests are porformed. The test equipment is shown in Figure 7.
Figure 7. Proctor Tests Equipments
8. CBR Test
CBR test is one of the tests performed to evaluate the strength properties of sub-base and base layer material in road embankments. The test equipment is shown in Figure 8.
Figure 8. CBR Test Equipments
9. Consolidation Test
Oedometer (consolidation) test is performed in the laboratory to determine the consolidation parameters of the soils. The test equipment is shown in Figure 9.
Figure 9. Consolidation Test Equipments |
