Nonlinear Analysis of Foundation Settlement by Modified Secant Modulus Method

Abstract:

A new technique namely modified secant modulus method（MSMM）considering time factor for nonlinear settlement computation of foundation is proposed. The principle of MSMM is using correction technique of reverse solution to solve modified secant modulus (MSM) of subsoil under different additional stress level with load-settlement test data, and the additional stress is solved with Boussinesq elasticity theory, then layer wise summation method is adopt to calculate the total settlement of foundation. The loading test results of footings performed by Briaud and Gibbens (1993) on sand foundation are analyzed with MSMM. Normalized settlement curves over width versus pressure for all footings can be obtained in normalization processing, and the calculation curve agrees well with the normalization curves. The loads of Q25 and Q150 corresponding to the settlements of 25mm and 150mm respectively of different size footings are calculated and the errors of them are within 10% compared with testing results, and the creep exponents of 3m south and north footing for 30 minutes load test were 0.036 and 0.030, then the calculated total settlement in 2014 (20 years later) will be 39.6 and 36.7mm respectively.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 259-265
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.259
• Online since: November 2012
• Authors: Ren Ping Li*
• Keywords: Creep Exponent, Modified Secant Modulus (MSM), Nonlinear Settlement, Normalization Curves

References

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[2] Jean-Louis Briaud, Robert Gibbens，Behavior of Five Large Spread Footings in Sand[J], Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 1999(9): 787-796.

DOI: 10.1061/(asce)1090-0241(1999)125:9(787)

[3] Gibbens R. and Briaud J.-L., Predicted and Measured Behavior of Five Spread Footings on Sand: Proceedings of a Prediction Symposium[M], Amer Society of Civil Engineers, Geotechnical Special Publication, No 41,1994.

[4] Jiao Wuyi，New Parameters of Foundation Deformation——the Principle and Application of Chord Modulus[J], Hydrogeology and Engineering Geology, 1982(1): 30-33. (Chinease)