That depends on soil type.
-2{NIF^H rv75R}.6R^ If for real prohject, do not guess, you should use the result from test. This is very fundmental parameter for soil.
MDHTZ94\Q r+4<Lon~ If you just input some number for prastice, you can pick number from your Geotechnical book.
[ 此贴被mano在2007-09-02 16:58重新编辑 ]