| Author | Azhar, Mohammed Mowjood Mohammed |
| Call Number | AIT Thesis no.GE-18-06 |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geotechnical and Earth Resources Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Foundations on expansive soils pose a unique challenge to a geotechnical engineer. The construction and design for foundations on expansive soils cost more as well.’ Free-field heave is the fundamental parameter on which foundation heave is calculated. A method for heave prediction using oedometer test data was outlined in Nelson and Miller (1992). The method is further studied and, is presented in Nelson et al. (2006). The free-field heave for a soil layer is calculated using the measured percent swell from a consolidation-swell (CS) test and the swelling pressure, σ'cv, measured in a constant volume (CV) test. Geotechnical engineers commonly use the CS test to determine swelling pressures. Therefore, it is convenient to develop a relationship between the swelling pressures, σ'cs, and σ'cv, so that that heave prediction can be determined from only a single test. Several investigators have proposed relationships between σ'cv and σ'cs (Edil & Alanazy, 1992; Reichler, 1997; Bonner, 1998; Thompson et al., 2006; Nelson et al., 2006 & 2012). Nelson and Chao (2014) proposed a relationship between σ'cv and σ'cs based on the experimental results of expansive soil behavior and facilitates the heave prediction from a single oedometer test for each soil. Their method used the parameter “m” which relies on specific soil property. This study further investigated the change of parameter” “m” for various soil samples. The soil sample used in this study was obtained from Lampang, Thailand. Furthermore, the effect of the degree of saturation, overburden stress and physical state of soil on the parameter “m” was evaluated in this study. One of the conclusions is that the “m” parameter decreases as the degree of saturation of the soil samples increases. The “m” parameter was found to increase with increasing overburden stresses. The trend of heave index with increasing inundation stresses was also evaluated. It was found that the heave index is a polynomial function of the applied stress. |
| Year | 2019 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Chao, Kuo-Chieh |
| Examination Committee(s) | Giao, Pham Huy;Noppadol Phien-Wej |
| Scholarship Donor(s) | AIT Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2019 |