Volumetric Changes and Point of Saturation around a Pressuremeter Probe Used in Unsaturated Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 141, Issue 11
Abstract
The interpretation of pressuremeter test results in cohesive soils assumes that the soil is saturated and the rate of loading is such that undrained conditions apply. Pressuremeter tests in compacted soils or heavily overconsolidated clays may have a degree of saturation that is less than 100%. Consequently, the soil may undergo volume changes during the initial stages of loading. Loading of the soil will result in the compression of occluded air and consequently the initial circumferential strains may be a function of volumetric changes and not a result of borehole expansion alone. A method to determine the applied radial total stress that will result in saturation for the pressuremeter test is developed based on Hilf’s method of pore water pressure prediction during compressive loading of an unsaturated soil. A method to quantify the volume change that will occur within the plastic region around the pressuremeter probe prior to saturation is also developed.
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Acknowledgments
The authors would like to acknowledge the contributions of the City of Edmonton, AECOM, the Ledcor Group for their roles in funding this work and providing access to the site, In Situ Engineering for providing the pressuremeter probe, Jacob Dafni for his help in carrying out the pressuremeter tests, and Mobile Augers for providing the drilling equipment and staff. This work was financially supported by Natural Sciences and Engineering Research Council of Canada (NSERC).
References
Bishop, A. W. (1954). “The use of pore-pressure coefficients in practice.” Geotechnique, 4(4), 148–152.
Clarke, B. G., Carter, J. P., and Wroth, C. P. (1979). “In situ determination of the consolidation characteristics of saturated clays. Design parameters in geotechnical engineering.” Proc., 7th European Conf. of Soil Mechanics and Foundation Engineering, Vol. 2, ISSMGE, Rotterdam, Netherlands, 207–211.
DeJong, J., and Harris, M. C. (1971). “Settlements of two multistory buildings in Edmonton.” Can. Geotech. J., 8(2), 217–235.
Doohan, J., and McLean, D. B. (1975). “Northeast rail rapid transit line.”, EBA Engineering Consultants, Edmonton, AB, Canada.
El-Nahhas, F. (1978). “Field measurements in two tunnels in the City of Edmonton.” M.Sc. thesis, Dept. of Civil Engineering, Univ. of Alberta, Edmonton, AB, Canada.
Fredlund, D. G., Rahardjo, H., and Fredlund, M. D. (2012). Unsaturated soil mechanics in engineering practice, Wiley, New York.
Gibson, R. E., and Anderson, W. F. (1961). “In situ measurement of soil properties with the pressuremeter.” Civil Eng. Public Works Rev., 56(658), 615–618.
Hilf, J. W. (1948). “Estimating construction pore pressures in rolled earth dams.” Proc., 2nd Int. Conf. on Soil Mechanics and Foundation Engineering, Vol. 111, ISSMGE, Rotterdam, Netherlands, 234–240.
May, R. W., and Thomson, S. (1978). “The geology and geotechnical properties of till and related deposits in the Edmonton, Alberta, area.” Can. Geotech. J., 15(3), 362–370.
Morgenstern, N. R., and Thomson, S. (1971). “Comparative observations on the use of the pitcher sampler in stiff clay.” Sampling of Soil and Rock: A Symp. Presented at the 73rd Annual Meeting, Vol. 483, ASTM, Toronto, 180.
Randolph, M. F., Carter, J. P., and Wroth, C. P. (1979). “Driven piles in clay—The effects of installation and subsequent consolidation.” Geotechnique, 29(4), 361–393.
Shaw, J. (1982). “Melt-out till in the Edmonton area, Alberta, Canada.” Can. J. Earth Sci., 19(8), 1548–1569.
Skempton, A. W. (1954). “The pore-pressure coefficients A and B.” Geotechnique, 4(4), 143–147.
Terzaghi, K. V. (1936). “The shearing resistance of saturated soils and the angle between the planes of shear.” Proc., 1st Int. Conf. on Soil Mechanics and Foundation Engineering, Vol. 1, ISSMGE, Rotterdam, Netherlands, 54–56.
Wittebolle, R. J. (1983). “The influence of microfabric on the engineering properties of glacial till.” M.Sc. thesis, Univ. of Alberta, Edmonton, AB, Canada.
Wroth, C. P., and Hughes, J. M. O. (1973). “An instrument for the in situ measurement of the properties of soft clays.” Proc., 8th Int. Conf. of Soil Mechanics and Foundation Engineering, Vol. 1, ISSMGE, Rotterdam, Netherlands, 487–494.
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© 2015 American Society of Civil Engineers.
History
Received: Aug 19, 2014
Accepted: Apr 17, 2015
Published online: Jun 5, 2015
Published in print: Nov 1, 2015
Discussion open until: Nov 5, 2015
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