CPT-based liquefaction analysis, Part 1: Determination of limit state function
Tóm tắt
This paper is the first of a set of two papers that address the issue of earthquake-induced liquefaction potential. In this paper, a CPT-based limit state function for assessing the cyclic liquefaction resistance of sandy soils is presented. The liquefaction resistance of a soil is generally expressed as cyclic resistance ratio (CRR), while the seismic load that causes liquefaction is expressed as cyclic stress ratio (CSR). By definition, CRR is equal to the maximum CSR that a soil can sustain without the occurrence of cyclic liquefaction. In the present study, a new method to establish a limit state function for evaluating cyclic liquefaction resistance is developed. This new method is based on an artificial neural network (ANN) modelling and analysis of 225 field liquefaction performance records. First, an ANN model is developed to predict the occurrence of liquefaction based on historic field performance records. Second, a search procedure is developed to locate data points on the limit state surface. Third, another ANN model is created to approximate the multi-variable limit state function. The established approximate function, an ANN model, can be used to determine the CRR of a soil using CPT data. The developed CPT-based limit state function forms the basis for the development of a risk-based method for assessing cyclic liquefaction potential.
Từ khóa
Tài liệu tham khảo
Agrawal G., 1995, Artificial neural networks for civil engineers: Fundamentals and applications
Ang A. H.-S., 1990, Probability concepts in engineering planning and design, Vol. II: Decision, risk, and reliability
Arulanandan K., 1986, Use of in situ tests in geotechnical engineering, 389
Bennett M. J., 1989, Bulletin of the Assoc. of Engineering Geologists, 26, 209
Bennett M. J., 1995, Geotechnical data from surface and subsurface samples outside of and within liquefaction-related ground failures caused by the October 17, 1989, Loma Prieta Earthquake, Santa Cruz and Monterey Counties, California, 10.3133/ofr95663
Bennett M. J., 1981, Subsurface investigation of liquefaction, Imperial Valley Earthquake, California, October 15, 1979, 10.3133/ofr81502
Bennett M. J., 1984, Geotechnical investigation of liquefaction sites, Imperial Valley, California, 10.3133/ofr84252
Bierschwale J. G., 1984, Analytical evaluation of liquefaction potential of sands subjected to the 1981 Westmorland Earthquake
Demuth H., 1999, Matlab Neural Network Toolbox, User's Guide
Idriss I. M., 1999, Proceedings, TRB Workshop on New Approaches to liquefaction Analysis
Kayen R. E., 1992, Proc. 4th Japan–US workshop on earthquake resistant design of lifeline facilities and countermeasures for soil liquefaction, 177
Kayen R. E., 1998, The Loma Prieta, California, Earthquake of October 17, 1989: Liquefaction, B61
Lunne T., 1997, Cone penetration testing
MathWork, Inc, 1999, Matlab User's Manual, Version 5.3, ExcelLink User's Manual, Version 1.2
Olsen R. S., 1997, Proceedings of the NCEER workshop on evaluation of liquefaction resistance of soils, 225
Olsen R. S., 1988, Proceedings, Earthquake Engineering and Soil Dynamics II Conference, 374
Robertson P. K., 1994, Proc. 47th Canadian Geotech. Conf., Halifax, 277
Robertson P. K., 1997, Proceedings of the NCEER workshop on evaluation of liquefaction resistance of soils, 41
Tinsley J. C., 1998, The Loma Prieta, California, Earthquake of October 17, 1989 Liquefaction, B287
USGS, 1990, Effect of Loma Prieta Earthquake on the Marina District, San Francisco, CA
Wayne A. C., 1998, The Loma Prieta, California, Earthquake of October 17, 1989: Liquefaction, B181
Youd T. L., 1997, Proceedings of the NCEER Workshop on Evaluation of Liquefaction Resistance of Soils