Designing and Evaluation of Low-Cost Dynamic Triaxial Apparatus
By: Afshin Shafigh
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Contributor(s): Pakbaz, Mohammad Siroos.
Publisher: Germany Springer 2021Edition: Vol.51(2), April.Description: 397-404p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: Dynamic triaxial test is one of the most common geotechnical laboratory tests to measure the dynamic properties of soils. Therefore, dynamic triaxial devices have been developed to increase the accuracy of measuring dynamic soil parameters as well as to automate the test steps. However, this matter requires complex design and modern instruments that can considerably increase the cost of construction. In this paper, a dynamic triaxial test apparatus was made with an emphasis on cost reduction by using inexpensive and available devices. In this regard, an open-loop control system has been used instead of a conventional closed-loop control system. However, there are two limitations for using this system as follows: (a) the tests can be conducted only in strain-controlled conditions and (b) dynamic loading must be applied at the frequency range of 0.5 Hz or less. The frequency of 0.5 Hz is recommended in relevant standards. To evaluate the performance of the apparatus, two tests were performed according to the conditions of a test conducted by a standard apparatus, and the results were compared together. The tests were performed in consolidated–undrained conditions on saturated sand specimens at 0.5 Hz loading frequency for a peak axial strain of 0.2% and 0.7%. The results showed the apparatus can be used to conduct the dynamic triaxial tests if these limitations are considered.
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2021-2022206 |
Dynamic triaxial test is one of the most common geotechnical laboratory tests to measure the dynamic properties of soils. Therefore, dynamic triaxial devices have been developed to increase the accuracy of measuring dynamic soil parameters as well as to automate the test steps. However, this matter requires complex design and modern instruments that can considerably increase the cost of construction. In this paper, a dynamic triaxial test apparatus was made with an emphasis on cost reduction by using inexpensive and available devices. In this regard, an open-loop control system has been used instead of a conventional closed-loop control system. However, there are two limitations for using this system as follows: (a) the tests can be conducted only in strain-controlled conditions and (b) dynamic loading must be applied at the frequency range of 0.5 Hz or less. The frequency of 0.5 Hz is recommended in relevant standards. To evaluate the performance of the apparatus, two tests were performed according to the conditions of a test conducted by a standard apparatus, and the results were compared together. The tests were performed in consolidated–undrained conditions on saturated sand specimens at 0.5 Hz loading frequency for a peak axial strain of 0.2% and 0.7%. The results showed the apparatus can be used to conduct the dynamic triaxial tests if these limitations are considered.
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