TECHNICAL PAPERS
Dec 1, 1988

In‐Situ Shear Test of Soil‐Root Systems

Publication: Journal of Geotechnical Engineering
Volume 114, Issue 12

Abstract

In situ shear tests were performed on soils reinforced by roots. Analytical models of soil‐root interaction presented in a companion paper were used to compute the forces in the roots and the contribution of the roots to the shearing resistance of the soil‐root system. General agreement between measured and computed shearing resistances was taken as verification of the analytical models. Results of the computations also showed the influence of the dimensions of the shear box on the measured shear strength. The shear strengths measured by the in situ tests were found to be less than the shear strength along a potential slip surface in slope stability problems. Methods for estimating the shear strengths for stability analysis are presented.

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References

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Broms, B. B. (1964). “Lateral resistance of piles in cohesive soils.” J. Soil Mech. Found. Engrg. Div., ASCE, 90(SM2), 27–63.
2.
Endo, T., and Tsuruta, T. (1969). “The effect of tree roots upon the shearing strength of soil.” Annual Report No. 18 (in Japanese), Hokkaido Branch, Tokyo Forest Experiment Station, Sapporo, Japan.
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Oden, J. T., and Ripperger, E. A. (1981). Mechanics of elastic structures. 2nd ed., McGraw‐Hill Book Co., New York, N.Y.
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O'Loughlin, C. L. (1974). “The effect of timber removal on the stability of forest soils.” J. of Hydrology, New Zealand, 13, 121–134.
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“Soil interpretation record.” (1975). File Code Soils‐12, U.S.D.A. Soil Conservation Service, Corvallis, Oreg.
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“Soil survey of Franklin County, Ohio,” (1980). U.S.D.A. Soil Conservation Service.
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Wu, T. H., McOmber, R. M., Erb, R. T., and Beal, P. E. (1988). “Study of soilroot interaction.” J. of Geotech. Engrg., ASCE, 114(12), 1351–1375.
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Wu, T. H., et al. (1985). “Root geometry model and simulation.” Civ. Engrg. Dept., Ohio State Univ., Columbus, Ohio.
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Published In

Go to Journal of Geotechnical Engineering
Journal of Geotechnical Engineering
Volume 114Issue 12December 1988
Pages: 1376 - 1394

History

Published online: Dec 1, 1988
Published in print: Dec 1988

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Authors

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Tien H. Wu, Fellow, ASCE
Prof. of Civ. Engrg., Ohio State Univ., Columbus, OH 43210
Philip E. Beal
Proj. Engr., Burgess and Niple, Ltd., 5085 Reed Rd., Columbus, OH 43220
Chinchun Lan
Research Graduate Assoc., Civ. Engrg. Dept., Univ. of Illinois, Urbana, IL 61801

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