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Groundwater flow and the stability of heterogeneous infinite slopes underlain by impervious substrata

By
William C. Haneberg
William C. Haneberg
New Mexico Bureau of Mines and Mineral Resources, Socorro, New Mexico 87801
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Published:
January 1995

Abstract

The effects of steady groundwater flow on the stability of heterogeneous infinite slopes underlain by impervious substrata were investigated using a series of computer simulations. A preliminary one-dimensional analysis shows that the magnitude of hydraulic head perturbation that can be attributed to flow across an idealized heterogeneity is controlled by both the size of the heterogeneity and the hydraulic conductivity contrast. In the limit, a perfectly impermeable heterogeneity will give rise to hydraulic gradients that are controlled by the normalized length of the heterogeneity, whereas an infinitely permeable heterogeneity will cause the hydraulic gradient to vanish across the heterogeneity. A series of two-dimensional finite-difference models shows that individual heterogeneities occupying 10% of the slope area can significantly perturb flow fields and influence local factors of safety in hypothetical slopes. Although local factors of safety are reduced enough to indicate the development of small secondary slides as a consequence of flow through or around heterogeneities, overall factors of safety remain unchanged. When heterogeneities are closely spaced, however, their effects on the stability of the model slopes are cumulative and in one case the overall factor of safety was increased by about 2%.

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Contents

Reviews in Engineering Geology

Clay and Shale Slope Instability

Edited by
William C. Haneberg
William C. Haneberg
New Mexico Bureau of Mines and Mineral Resources Campus Station Socorro, New Mexico 87801
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Scott A. Anderson
Scott A. Anderson
Department of Civil Engineering University of Hawaii Holmes Hall 383 2540 Dole Street Honolulu, Hawaii 96822
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Geological Society of America
Volume
10
ISBN electronic:
9780813758107
Publication date:
1995

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