Braced Excavations: Temperature, Elastic Modulus, and Strut Loads
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 126, Issue 10
Abstract
Relationships between strut loads, earth pressures, temperatures, and the measurements provided by strain gauges are presented in this paper. A braced excavation up to 20-m deep, 9–20 m wide, and >650-m long constructed in competent glacially derived sand, silt, and clay soils (including glacial till) provided a significant amount of data for analysis. The excavation was supported by soldier piles and lagging with pipe struts and was covered with decking during construction. A direct correlation between incremental changes in strut load and temperature was observed during the course of the project. The few existing relationships between strut load and temperature were reexamined and were found to produce back-calculated elastic modulus values that were either without comparison or inconsistent with data from field tests and published sources. The relationships derived as a result of this work are supported by limited case-history data from other published sources and are consistent with practical application of elastic deformation concepts and published soil modulus values.
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References
1.
Base, G. D. ( 1955). “Further notes on the Demec, a demountable mechanical strain gage for concrete structures.” Mag. of Concrete Res., London, 7(19), 35–38.
2.
Batten, M., and Powrie, W. ( 1996). “Prop loads in large braced excavations.” Ground Engrg., London, October, 29–30.
3.
Boone, S. J., Bidhendi, H., Westland, J., and Grabinsky, M. ( 1999a). “Rationalizing the practice of strut preloading for braced excavations.” Geo-engineering for underground facilities, Geotech. Spec. Publ. No. 90, ASCE, Reston, Va., 393–404.
4.
Boone, S. J., Westland, J., and Nusink, R. ( 1999b). “Comparative evaluation of building responses to an adjacent deep braced excavation.” Can. Geotech. J., Ottawa, 36(2), 210–223.
5.
Briaud, J. L. ( 1986). “Pressuremeter and foundation design.” Use of in situ tests in geotech. engrg., Geotech. Spec. Publ. No. 6, ASCE, New York, 74–115.
6.
Chapman, K. R., Cording, E. J., and Schnabel, H. ( 1972). “Performance of a braced excavation in granular and cohesive soils.” Proc., Spec. Conf. on Perf. of Earth and Earth Supported Struct., Vol. 3, ASCE, New York, 271–293.
7.
D'Appolonia, D. J., D'Appolonia, E., and Brissette, R. F. (1968). “Settlement of spread footings on sand.”J. Soil Mech. and Found. Div., ASCE, 94(3), 735–760.
8.
D'Appolonia, D. J., D'Appolonia, E., and Brissette, R. F. (1970). “Settlement of spread footings on sand, closure.”J. Soil Mech. and Found. Div., ASCE, 96(2), 754–761.
9.
Dunnicliff, J. ( 1988). Geotechnical instrumentation for monitoring field performance, Wiley, New York.
10.
Endo, M., and Kawasaki, T. ( 1963). “Study of thermal stresses acting on struts.” Trans. Arch. Inst. of Japan, 63, 689–692.
11.
FLAC user's manual. (1996). Itasca Consulting Group Inc., Minneapolis.
12.
Goldberg, D. T., Jaworski, W. E., and Gordon, M. D. ( 1976). “Lateral support systems and underpinning: Vol. II—Design fundamentals, Vol. III—Construction methods.” Rep. No. FHWA-RD-75-130, Fed. Hwy. Admin., U.S. Department of Transportation, Washington, D.C.
13.
Ishii, Y., Miyazaki, Y., Murata, J., and Kazama, S. ( 1995). “Lateral pressures acting on earth retaining systems—A survey on Japanese literature.” Underground construction in soft ground, K. Fujita and O. Kusakabe, eds., Balkema, Rotterdam, The Netherlands, 283–290.
14.
Kulhawy, F. H., and Mayne, P. ( 1990). “Manual on estimating soil properties for foundation design.” Rep. EPRI EL-6800, Electric Power Research Institute, Palo Alto, Calif.
15.
Lateral earth pressure studies on strutted excavations of the Toronto subway system. (1967). Toronto Transit Commission, Toronto.
16.
Norwegian Geotechnical Institute (NGI). ( 1962a). “Measurements at a strutted excavation.” Oslo Tech. School, Tech. Rep. No. 2, Oslo.
17.
Norwegian Geotechnical Institute (NGI). ( 1962b). “Vibrating wire measuring devices used at strutted excavations.” Tech. Rep. No. 9, Oslo.
18.
Norwegian Geotechnical Institute (NGI). ( 1965). “Measurements at a strutted excavation, the new headquarters building of the Norwegian Telecommunication Administration, Oslo.” Tech. Rep. No. 4, Oslo.
19.
O'Rourke, T. D., and Cording, E. J. ( 1975). “Measurement of strut loads by means of vibrating wire strain gages.” Performance monitoring for geotechnical construction, ASTM STP 584, ASTM, West Conshohocken, Pa., 58–77.
20.
Peck, R. B. ( 1969). “Deep excavations and tunnelling in soft ground: State-of-the-art report.” Proc., 7th Int. Conf. on Soil Mech. and Found. Engrg., Sociedad Mexicana de Mecánica de Suelos, Mexico City, 225–290.
21.
Soil mechanics, design manual 7.1, NAVFAC DM-7.1. (1982). United States Department of the Navy, Alexandria, Va.
22.
Terzaghi, K. ( 1943). Theoretical soil mechanics, Wiley, New York.
Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 126 • Issue 10 • October 2000
Pages: 870 - 881
History
Received: May 21, 1998
Published online: Oct 1, 2000
Published in print: Oct 2000
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