G MS THESIS_final version_Maxim Prokudin.pdf - Digital Repository ...

159Groups of PiersGroup of Aggregate PiersSeveral findings were discovered associated with the behavior of the aggregate piers withinthe group:the stress imposed on group of short piers was twice as less as the stress carried bythe group of long piers at the same amount of settlement,stiffness modulus values obtained in the lab were found to be higher than the oncetypically obtained in the field,short groups of aggregate piers at service load had a consistent group efficiency valueranging between two and three independently of the number of piers within the group,long groups of aggregate piers at service load had a consistent group efficiency valueranging between one and two independently of the number of piers within the group,Major findings for groups of aggregate piers have shown relationship between imposed stressand group efficiency factors in terms of pier lengths. Also, the scaling may have contributedtowards the stiffer response of lab piers, thus, methods of scaling must be revisited.Group of C(I) + C(K) PiersSeveral findings were discovered associated with the behavior of the cement type I and Kcomposition piers within the group:a single cement type I and K composition pier within the group of piers couldn’tachieve efficiency of an isolated pier efficiency of 1.0,group efficiency lab generated values were found to closely correlate to the fieldgroup efficiency values,at the same amount of settlement short piers were able to resist less load than longpiers.