TIME-DEPENDENT PROPERTIES OF EMBEDMENT SOILS BACK-CALCULATED FROM DEFLECTIONS OF BURIED PIPES.
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The viscoelastic solution which can model time-dependent soil-pipe interaction was transformed from a linear elastic solution using the 'correspondence principle' is presented. A method is now available by which the relaxation modulus of the soil surrounding a pipe can be back-calculated from the pipe deflections which have been measured over a period of time. Since the relaxation properties of the pipe material can be obtained easily from the laboratory or from published data, the pipe deflection caused by the relaxation of the pipe material under a constant load can be calculated. The relaxation modulus of the surrounding soil can then be calculated from the remaining deflection which is contributed by the relaxation of the soil. Relaxation moduli and compaction level of the sandy soils surrounding six pipes were back-calculated from pipe deflections obtained over a twelve year period using the viscoelastic solution.
