Monitoring Behavior of Grouted Anchors Using Vibrating-Wire Gauges
Publication: Journal of Geotechnical Engineering
Volume 121, Issue 6
Abstract
Long-term monitoring of the behavior of ground anchors constitutes an important aspect of the stability of structures reinforced by such structural members. The present paper describes full-scale tests performed on three instrumented grouted anchors in the laboratory and one other instrumented anchor in the field. Due to the long-term reliability, stability, and accuracy, two types of surface-mounted vibrating wire gauges were used to instrument the anchors. A series of vibrating-wire gauges were microwelded on the anchors at certain intervals along their lengths. The performance of these gauges, the load transfer mechanism, the debonding process, creep behavior, and long-term performance of the anchors under loading, unloading, and sustained loading, were investigated in the laboratory. A practical application and test results of an instrumented anchor at Jeffrey Mine in Asbestos, Canada, are described. The results obtained show that this instrumentation technique of grouted anchors is efficient for long-term monitoring.
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References
1.
Antill, J. M.(1965). “Relaxation characteristics of prestressing tendons.”Trans., Inst. of Engrs., Australia, 7(2), 151–159.
2.
Aydan, O. (1989). “The stabilization of rock engineering structures by rockbolts,” PhD thesis, Nagoya University, Nagoya, Japan.
3.
Aydan, O., Ichikawa, Y., and Kawamoto, T. (1985). “Load bearing capacity and stress distribution in/along rockbolts with inelastic behavior of interfaces.”Proc., Fifth Int. Conf. on Numerical Methods in Geomech., Nagoya, Japan, Vol. 2, 1281–1292.
4.
Benmokrane, B. (1990). “Finite element study on the behavior of grouted anchors subjected to static uplift loads.”Can. J. Civ. Engrg., 17(2), 129–141 (in French).
5.
Benmokrane, B., and Ballivy, G. (1991a). “Investigation of stress distribution along cement grouted rock anchors under uplifting loads.”CIM Bull., 84(951), 45–52 (in French).
6.
Benmokrane, B., and Ballivy, G.(1991b). “Five year monitoring of load losses on prestressed cement grouted rock anchors.”Can. Geotech. J., 28(5), 668–677.
7.
Benmokrane, B., Ballivy, G., Chaallal, O., and Pigeon, M. (1992). “Experimental study of the strains generated in concrete by variations in climatic conditions.”Mat. and Struct. J., 25(147), 149–156.
8.
Björnfot, F., and Stephansson, O. (1983). “Interaction of grouted rock bolts and hard rock masses at variable loading in a test drift of the Kiirunavaara Mine, Sweden.”Proc., Int. Symp. on Rock Bolting, Abisko, Sweden, A. A. Balkema, Rotterdam, The Netherlands, 377–396.
9.
Bordes, J. L., and Debreuille, P. J. (1985). “Some factors about long-term reliability of vibrating wire instruments.”Symp. on Reliability of Geotech. Instrumentation, National Research Council Transportation Research Board, Washington, D.C.
10.
“British standard code of practice for ground anchors.” (1989). BS8081, British Standards Institution, London, England.
11.
Bruce, D. A. (1993). “The stabilization of concrete dams by post-tensioned rock anchorages: the state of American practice.”Geotech. Spec. Publ. No. 35, Geotech. Practice in Dam Rehabilitation, ASCE, New York, N.Y., 320–332.
12.
Chekired, M. (1993). “The use of vibrating wire strain gauges in the instrumentation of injected anchors,” MSc. thesis, Universitè de Sherbrooke, PQ, Canada (in French).
13.
Coates, D. F., and Yu, Y. S. (1970). “Three dimensional stress distributions around a cylindrical hole and anchor.”Proc., 2nd Conf. on Int. Soc. of Rock Mech., Laboratoire Nacional de Engenharia Civil, Lisbon, Portugal, Vol. 2, 175–182.
14.
Dreyer, H. (1979). “Long-term measurements in rock mechanics by means of Maihak vibrating wire instrumentation.”Proc., Int. Symp. on Field Measurements in Rock Mech., A. A. Balkema, Rotterdam, The Netherlands, 109–122.
15.
Dunham, R. K. (1976) “Anchor tests on strain gauged resin bonded bolts.”Tunnels and Tunneling, Sept., 73–76.
16.
Dunnicliff, J. (1988). Geotechnical instrumentation for monitoring field performance. John Wiley & Sons, New York, N.Y.
17.
Farmer, I. W.(1975). “Stress distribution along a resin grouted rock anchor.”Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., 12(11), 347–351.
18.
Féderation Internationale de la Précontrainte (FIP). (1986). “Corrosion and corrosion protection of prestressed ground anchorages.”State of the Art Rep., Thomas Telford, Ltd., London, England.
19.
Franklin, J. A., and Denton, P. E. (1973). “The monitoring of rock slopes.”Quarterly J. Engrg. Geology, 6(3&4), 259–286.
20.
Freeman, B. A. (1978). “The behavior of fully bonded rock bolts in the Kielder experimental tunnel.”Tunnels and Tunneling, June, 37–40.
21.
Habib, P. (1989). Recommendations for the design, calculation, construction and monitoring of ground anchors. A. A. Balkema, Rotterdam, The Netherlands.
22.
Hanna, T. H. (1982). Foundation in tension—ground anchors. Trans Tech Publications and McGraw-Hill Book Company, New York, N.Y.
23.
Hanna, T. H. (1985). Field instrumentation in geotechnical engineering. Trans Tech Publications, Clausthall-Zellerfeld, Germany.
24.
Hinks, J. L., Burton, I. W., Peacock, A. R., and Gosschalk, E. M. (1990). “Post-tensioning Mullardock Dam in Scotland.”Water Power and Dam Constr., Nov., 12–15.
25.
Hutchinson, D. J., and Grabinsky, M. W. (1992). “Back analysis of stope stability at Ansil Mine using instrumentation data and numerical modeling.”Proc., Int. Symp. on Rock Support in Min. and Underground Constr., Sudbury, Ontario, Canada, P. K. Kaiser and D. R. McCreath, eds., A. A. Balkema, Rotterdam, The Netherlands, 167–176.
26.
Indraratna, B., and Kaiser, P. K.(1990). “Design for grouted rock bolts based on the convergence control method.”Int. J. Rock Mech. Min. Sci. and Geomech. Abstr., 27(4), 269–281.
27.
Littlejohn, G. S., and Bruce, D. A. (1977). “Rock anchors: state-of-the-art.” Foundation Publication Ltd., Brentwood, Essex, England.
28.
Littlejohn, G. S., and Bruce, D. A.(1979). “Long-term performance of high capacity rock anchors at Devonport.”Ground Engrg., 12(7), 25–33.
29.
Littlejohn, G. S., and Xu, H. (1993). “The service behavior of ground anchors at Pen y Clip Tunnel (1990–1992).”TRRL Ground Anchor Monitoring Proj. Rep., University of Bradford, Bradford, England.
30.
Magura, D. D., Sozen, M. A., and Siess, C. P.(1964). “A study of stress relaxation in prestressing reinforcement.”J. Prestressed Concr. Inst., 9(2), 13–17.
31.
McRae, J. B., and Simmonds, T. (1991). “Long-term stability of vibrating wire instruments: one manufacturer's perspective.”Proc., 3rd Int. Conf. on Field Measurements in Geomech., A. A. Balkema, Rotterdam, The Netherlands, Vol. 1, 283–293.
32.
Mihajlov, K. V. (1968). “Stress relaxation of high tensile steel.”Proc., Fédération Int. de la Precontrainte, Symp. on Steel for Prestressing, FIP, Paris, 57–78.
33.
Myrvang, A., Stjern, G., and Morseth, B. (1992) “Performance of fully grouted rebar anchors and shotcrete in a 61 m span.”Proc., Int. Symp. on Rock Support in Min. and Underground Constr., Sudbury, Ontario, Canada, P. K. Kaiser and D. R. McCreath, A. A. Balkema, Rotterdam, The Netherlands, 117–122.
34.
Natau, O. P., and Wullschlager, D. H. (1983). “Theoretical and experimental studies in bearing behavior and corrosion protection of rock anchors up to a load limit of about 2900 kN.”Proc., 5th Congr., Int. Soc. Rock Mech., Melbourne, Australia, A59–A64.
35.
Schnabel, H. Jr. (1974). “Procedures for testing earth tiebacks.”Proc., Nat. Struct. Engrg. Meeting, ASCE, New York, N.Y., 115–125.
36.
Sharp, J. C., Lemay, C., and Neville, B. (1987). “Excavation, reinforcement and monitoring of a 300 m high rock face in slates.”Proc., 6th Int. Congr. on Rock Mech., A.A. Balkema, Rotterdam, The Netherlands, Vol. 1, 533–540.
37.
Shields, D. R., Schnabel, H. Jr., and Weatherby, D. E.(1978). “Load transfer in pressure injected anchors.”J. Geotech. Engrg. Div., ASCE, 104(9), 1183–1196.
38.
Sørum, G., and Dyken, T. (1987). “Vibrating-wire reinforcement strain gauges for performance monitoring of large concrete structures.”IABSE Rep.: Monitoring of Large Struct. and Assessment of Their Safety, International Association for Bridge and Structural Engineering, Zurich, Switzerland, Vol. 56, 263–280.
39.
Stirling, D. M., Chandler, J. H., and Clark, J. S. (1992). “Monitoring one of Europe's largest retaining walls using oblique aerial photograph.”Int. Soc. for Archives Photogrammetry and Remote Sensing XXIX, Washington, D.C., B5, 701–708.
40.
Tunbridge, L. W., and ∅ien, K. (1987). “The advantages of vibrating wire instruments in geotechnics.”2nd Int. Symp. on Field Measurements in Geomech., A. A. Balkema, Rotterdam, Vol. 1, 3–16.
41.
Weerasinghe, R. B. (1993). “The behavior of anchorages in weak mudstone,” PhD thesis, University of Bradford, Bradford, England.
42.
Xanthakos, P. (1991). Ground anchors and anchored structures. John Wiley and Sons, New York, N.Y.
43.
Xu, H. (1993). “The dynamic and static behavior of resin bonded rock bolts in tunneling,” PhD thesis, University of Bradford, Bradford, England.
44.
Yap, P., and Rodger, A. A.(1984). “A study of the behavior of vertical rock anchors using finite element method.”Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., 21(2), 47–61.
Information & Authors
Information
Published In
Journal of Geotechnical Engineering
Volume 121 • Issue 6 • June 1995
Pages: 466 - 475
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Jun 1, 1995
Published in print: Jun 1995
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