Use of cyclic tri-axial apparatus to assess cyclic strength of soils | |
| Author | Dikshit, Saransh |
| Call Number | AIT Caps. Proj. no.CIE-16-06 |
| Subject(s) | Sandy soils--Testing Terminology |
| Note | A capstone project report submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Engineering Civil And Infrastructure Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Caps. Proj. ; no. CIE-16-06 |
| Abstract | In order to assess the cyclic behavior of sandy soils from northern part of India, stress and strain controlled cyclic tri-axial tests were carried out for Ganga and Yamuna Sand. The effects of relative density, confining pressure, cyclic stress ratio (stress controlled tests) and shear strain (strain controlled tests) on cyclic strength of the soils were studied. Also, the effects of relative density and shear strain on the shear modulus and damping ratio were also studied for the strain controlled tests. For a given relative density, the liquefaction resistance of the soil can be shown by a cyclic stress ratio and number of loading cycles required to cause liquefaction, in case of stress controlled tests. For strain controlled tests, the same resistance is measured by the shear strain and the number of loading cycles required to cause liquefaction. For a given relative density, it was found that the number of cycles required to cause liq- uefaction of the sand sample increased with decreasing cyclic stress ratio (stress controlled tests) and shear strain (strain controlled tests). Thus, the resistance to liquefaction increased with decreasing cyclic stress ratio or shear strain. The effects of relative density showed that as the density of sand sample increased,the resistance to liquefaction is also increased. This behavior was shown by both the sands under both stress and strain controlled tests. The ef- fects of confining pressure showed that resistance to liquefaction increased as the confining pressure was increased. The dynamic properties of both the sands namely the shear modulus and damping ratio were evaluated under strain controlled tests. The shear modulus and the damping ratio both showed a decreasing trend with the number of loading cycles irrespective of the sand type, relative density or shear strain. Also, the shear modulus and damping ratio calculated during the tests were found to decrease and to increase with increasing shear strain, respectively. For a given relative density, for a given number of cycles, the shear modulus decreases as the amplitude of cyclic shear strain increases and damping ratio increases with increasing strain amplitudes. For different relative densities, it was observed that both shear modulus and damping ratio decreased with decreasing relative density for a given shear strain level. |
| Year | 2016 |
| Corresponding Series Added Entry | Asian Institute of Technology. Caps. Proj. ; no. CIE-16-06 |
| Type | Capstone Project |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Civil and Infrastructure Engineering (CIE) |
| Chairperson(s) | Noppadol Phien-wej |
| Examination Committee(s) | Tian Ho Seah |
| Degree | Capstone Project (B.Sc.)-Asian Institute of Technology, 2016 |