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Therefore the pipe in this paper has higher specific stiffness (kN/m/m) than 1 Pipelines 2008 © 2008 ASCE the thin-walled pipes as above. 4674ρtR4)/(EI); where ρ is density of the steel per unit length, R is radius of the pipe. Thus, cross-sectional deformation mode of the flexure pipe having large diameter is the main focus in this study. Ground condition and test procedures Figure 1 shows the cross-sections of the field test. It is noted that the actual cross-section was symmetric. In Case-1, soil-cement was filled up and compacted in the area of from the bottom of the pipe to a height of half the pipe diameter.

A. (1971). ”, Journal of Engineering Mechanics, ASCE, Vol. 97, No. 2, pp. 333-342. [9] Glock, D. (1977). ” (Post-Critical Behavior of a Rigidly Encased Circular Pipe Subject to External Water Pressure and Thermal Extension), Der Stahlbau, Vol. 7, pp. 212-217. , and Moore, I. D. (1998). ”, Journal of Structural Engineering, ASCE, Vol. 124, No. 11, pp. 1350-1357. [11] Montel, R. (1960). , pp. 560-568. [12] Amstutz, E. (1969). ”, Schweizerische Bauzeitung, Vol. 87, pp. 541-549. S. Dept. of the Interior, Translation No.

2005). 4, Providence, RI, USA [19] Aggarwal, S. , and Cooper, M. J. (1984). K. [20] Jeyapalan, J. , and Watkins, R. K. (2004). ” Journal of Transportation Engineering, ASCE, Vol. 130, No. 1, pp. 43-48. Figure 1 Buckling of an unconfined cylinder under uniform external pressure; experiment and finite element simulation. undeformed p initial imperfection T A G0 p G B' deformed Figure 2 Schematic representation of a confined ring under uniform external pressure. T B Pipelines 2008 © 2008 ASCE L Slice of confined cylinder H y y x x initial gap amplitude z cylinder g R (a) (b) Figure 3 (a) Finite element model of embedded cylinder, (b) schematic representation of initial gap between the cylinder and the surrounding medium.

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