2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Ashutosh Dhar, Memorial University of Newfoundland
Mr. Abu Hena Muntakim, Memorial University of Newfoundland
Dr. Bipul Chandra Hawlader, Memorial University of Newfoundland
Behavior of buried structure is significantly governed by the strength and deformation parameters of the surrounding soil. In conventional analysis for assessing soil–structure interaction, soil parameters are selected based on typical values available in published literature. Published literature includes extensive information on soil parameters obtained from various laboratory tests. However, most of these parameters were obtained from testing of standard soils, which are likely to be different from those of local soil where a buried structure is located. The objective of the current study is to investigate the strength and deformation parameters of a local sandy soil used as a backfill material in a buried pipeline test. The soil is used in a buried pipe test facility recently developed at Memorial University of Newfoundland. The test facility is designed to simulate a ground condition to study the response of buried pipeline. The soil is classified as a well-graded clean sand (SW) according to the Unified Soil Classification System (USCS). Direct shear and triaxial tests were conducted with the local soil to examine the stress–strain response and shearing mechanisms at different confining pressures and densities. The study reveals that the presence of some coarse particles in the local soil significantly alters the shearing response, when compared with test results without the coarse fraction. The effects of the presence of different sizes of coarse particles are investigated through performing tests on sample with removal of the coarse particles. Tests are also conducted for laboratory silica sand at similar densities and confining pressures. Test results for the local soil are compared with those for the silica sand. The paper concludes with the recommendations for strength and deformation parameters of the local soil.