The Earthquake Engineering Online ArchiveFEQDrain: a finite element computer program for the analysis of the earthquake generation and dissipation of pore water pressure in layered sand deposits with vertical drainsPestana, Juan M.; Hunt, Christopher E.; Goughnour, Roy R. UCB/EERC-97/15, Earthquake Engineering Research Center, University of California, Berkeley, 1997-12, 88 pages (480/P47/1997) One method of soil stabilization for potentially liquefiable sites is the use of a system of vertical drains to dissipate the excess pore water pressure generated by earthquake loading, thus avoiding liquefaction. Performance assessments for these systems require the estimation of vertical drain spacing such that a maximum threshold level of excess pore pressure ratio is not exceeded. This report discusses the development of FEQDrain, a finite element computer code for analyzing three-dimensional pore pressure generation and dissipation in layered sand deposits with vertical drains. The analysis includes modeling of gravel drains and prefabricated drains with storage capacity. The program is capable of analyzing several different drainage scenarios for a layered soil profile, including: (a) no drain -- pretreatment conditions; (b) perfect drain -- no drain resistance; (c) gravel drains/stone columns -- constant hydraulic conductivity drains; and (d) prefabricated drains. The program has the capacity to analyze a wide range of practical problems relating to the performance of these vertical drains and includes the modeling of storage capacity resulting from the presence of a man-made reservoir. This report describes the selection of input parameters and illustrates the application of the program for various types of drains. Available online: http://nisee.berkeley.edu/documents/EERC/EERC-97-15.pdf (1 MB)
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