Influence of Grouting Pressure and Overburden Stress on the Interface Resistance of a Soil Nail
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 9
Abstract
Grouted soil nails are widely used in slope stabilization. The influence of both grouting pressure and overburden stress on the soil-nail pullout interface shear resistance is still not well understood due to the complex of soil-grout interactions. A series of laboratory soil-nail pullout tests have been carried out on a completely decomposed granite soil in nearly saturated condition under a combination of different grouting pressures and overburden stresses. The pullout tests simulate the real construction process of a soil nail, including establishment of initial soil stresses in a soil slope, drilling a hole with stress release, grouting, and soil-nail pullout when the slope is sliding. The pullout box is well instrumented. Test data are collected automatically by a data logger. Typical test results are presented, explained, and discussed in this paper. The soil-nail interface shear resistance data from all tests are analyzed and interpreted. The study shows that the grouting pressure and overburden stress have interactional influence on the soil-nail pullout resistance. Based on the test results, a new empirical liner equation with two grouting pressure dependent parameters is proposed for calculation of soil-nail pullout resistance considering both grouting pressure and overburden stress. New understandings and findings from the study are presented.
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Acknowledgments
The writers thank Mr. C. Y. Hong and Ms. L. Lai for their assistance in carrying out the laboratory soil-nail pullout tests in this paper. Financial support from The Hong Kong Polytechnic University and a grant from Research Grants Committee (Grant No. UNSPECIFIEDPolyU 5174/04E) of the Hong Kong Special Administrative Region Government of China are gratefully acknowledged.UNSPECIFIED
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© 2009 ASCE.
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Received: Feb 5, 2008
Accepted: Jan 16, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
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