1)group reduction factor [pile group],桩组折减系数2)reduction factor of the soil between piles,桩间土折减系数3)discount coefficient of group piles,群桩折减系数4)stress reduction coefficient of pile and nearby soil,桩间土应力折减系数5)pile groups earth pressure reduction coefficient,群桩土反力折减系数6)bearing capacity reduction coefficient of soil among piles,桩间土承载力折减系数