Side Shear Induced in Drilled Shaft by Suction Change
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 124, Issue 8
Abstract
This paper describes an experimental study in which a 305 mm diameter instrumented drilled shaft was installed in a moderately expansive clay soil during the dry season and monitored over a period of about 15 months. The purpose of the study was to investigate the effects of seasonal moisture changes in the soil on the unit shear stresses imposed on the sides of the drilled shaft. The soil in the vicinity of the test shaft was instrumented to measure suction and ground surface movement. The relation between total suction, total stress, and shear strength of the soil at the test site was determined through laboratory triaxial compression testing. Daily rainfall and temperatures were also monitored. Over the course of the study, induced side shear stresses of up to 54 kPa were measured in the test shaft. A simple computational model was developed to relate observed suction changes to unit side shear stresses induced by the expansion of the soil through the use of the laboratory total suction-total-stress-shear strength relation.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Escario, V., and Juca, J. (1989). “Strength and deformation of partially saturated soils.”Proc., 12th Int. Conf. on Soil Mech. and Found. Engrg., ISSMFE, Rio de Janeiro, Vol. 3, 43–46.
2.
Fredlund, D. G. (1983). “Prediction of ground movements in swelling clays.”Proc., 31st Annu. Soil Mech. & Found. Engrg. Conf., ASCE, Reston, Va.
3.
Fredlund, D. G., Morgenstern, N. R., and Widger, R. A.(1978). “The shear strength of unsaturated soils.”Can. Geotech. J., 15, 313–321.
4.
Gan, J. K. M., Fredlund, D. G., and Rahardjo, H.(1988). “Determination of the shear strength parameters of an unsaturated soil using the direct shear test.”Can. Geotech. J., 25, 500–510.
5.
Johnson, L. D., and Snethen, D. R.(1978). “Prediction of potential heave of swelling soils.”Geotech. Testing J., 1(3), 117–124.
6.
Karube, D. (1988). “New concept of effective stress in unsaturated soil and its proving test.”Advanced triaxial testing of soil and rock, ASTM Special Tech. Publ. No. 977, 539–552.
7.
Kim, M. H. (1996). “Effect of an expansive clay on the behavior of drilled shafts,” PhD dissertation, Univ. of Houston, Houston, Tex.
8.
O'Neill, M. W. (1988). Adaptive model for drilled shafts in expansive clay. ASCE Geotech. Special Pub. No. 16, 1–20.
9.
O'Neill, M. W., and Poormoayed, N.(1980). “Methodology for foundations on expansive clays.”J. Geotech. Engrg. Div., ASCE, 106(12), 1465–1488.
10.
Vanapalli, S. K. (1994). “Simple test procedures and their interpretation in evaluating the shear strength of unsaturated soils,” PhD dissertation, Univ. of Saskatchewan, Saskatoon, Canada.
11.
Wheeler, S. J., and Sivakumar, V.(1995). “An elastic-plastic critical state framework for unsaturated soil.”Geotechnique, 45(1), 35–53.
Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 124 • Issue 8 • August 1998
Pages: 771 - 780
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Aug 1, 1998
Published in print: Aug 1998
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.