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Estimation of Micropile Capacity Grouted under Pressure
Current Issue
Volume 1, 2014
Issue 2 (May)
Pages: 11-14   |   Vol. 1, No. 2, May 2014   |   Follow on         
Paper in PDF Downloads: 60   Since Aug. 28, 2015 Views: 1641   Since Aug. 28, 2015
Authors
[1]
H. Elarabi, Building and Road Research Institute, University of Khartoum, Khartoum, Sudan.
[2]
M. Alhadi Alshareef, Building and Road Research Institute, University of Khartoum, Khartoum, Sudan.
Abstract
The aim of this paper is to study the behavior of micropile type B where neat cement grout is placed into the hole under pressure. Numerical analysis is used to simulate this behavior. The model was verified against field test data performed on Khartoum soil. These models are introduced briefly, and then used to investigate the effect of pressure grouting on micropile. For micropiles of diameter less than 25cm a considerable increase in their capacities was deduced due to increase in pressure. For any diameter larger than 30cm it is expected that, the pressure will have no effect on increasing the pile diameter and thus the capacity of pile. This why micropiles diameter are assumed ≤ 30cm. Though the factor (f) for micropiles with diameters greater than 10cm and less than 20cm can be estimated using certain equation developed in this study. The results of the developed model are in good agreement with the experimental results.
Keywords
Micropile, Finite Element, Grouting, Failure Load, Cohesive Soil
Reference
[1]
Federal Highway Administration 2005. Micropile Design and Construction Guidelines – Implementation Manual, FHWA Publication No. FHWA-SA-97–070, US Department of Transportation, McLean, VA, USA.
[2]
Chin, F.K. (1970) “Estimation of ultimate load of piles not carried to failure” Proceedings, 2nd Southeast Asia Conference on Soil Engineering, 81-90.
[3]
Davisson, M.T. (1972) “High capacity piles” Proceedings, Lecture Series, Innovations in Foundation Construction, ASCE, Illinois Section, 52 pp
[4]
Hirany, A. and Kulhawy, F.H. (1989) “Interpretation of load tests on drilled shafts – Pt. 1: Axial compression” Fndn. Eng. Current Principles and Practices, GSP 22, Ed. Fred Kulhawy, ASCE, New York, 1132-1149.
[5]
Brinkgreve, R.B.J., (1994). Geomaterial Models and Numerical Analysis of Softening. Dissertation. Delft University of Technology.
[6]
FHWA, Drilled and Grouted Micropiles State-of-the-Practice Review. Report No. FHWA-RD-96-016/019, United States Department of Transportation, July 1997,
[7]
Hirany, A. and Kulhawy, F., “On the Interpretation of Drilled Foundation Load Test Results,” Deep Foundations 2002, ASCE Special Publication No. 116, Orlando, Florida, February 2002.Four Volumes.
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