GGSD Program Details for FEQDrain

FEQDrain

Category	Ground improvement
Publisher	NISEE - University of California, Berkeley
Platform	Win95/98, WinNT
Status	Public domain
Description	FEQDrain is a Finite Element Computer Program for the Analysis of the Earthquake Generation and Dissipation of Pore Water Pressure in Layered Sand with Vertical Drains. 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. FEQDrain can be used to analyze three dimensional pore pressure generation and dissipation in layered sand deposits with geocomposite vertical drains for liquefaction mitigation. There are four different modes in which to analyze a problem. Option 1 considers the performance of a soil profile without any ground improvement (i.e. no drain is installed). Pore pressure generated by the earthquake can only migrate in a vertical direction. Option 2 examines soil layers with a perfect drain that dissipates any pore pressure that reaches it. Option 3 examines soil layers with a drain, but with constant values of vertical and horizontal hydraulic conductivity within the drain. Option 4 examines soil layers with a drain with properties guiding the nonlinear resistance that water will feel as it flows into and through the drain. This option can also include the presence of a reservoir to collect water rising through the drain. The program and the associated Report No. UCB/EERC-97/15 can be downloaded from the WWW.
Cost	Free on WWW
Data formats supported	None stated
Supplier in United States of America	NISEE - University of California, Berkeley