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2.2.1 Action and action effect
F t ——design value of hoop tension per unit height of ringwall；
F t0 ——design value of hoop tension per unit height of outside ringwall；
f a ——modified characteristic value of subgrade bearing capacity；
F k ——vertical force transferred to foundation top surface from the upper structure corresponding to nominal load combination；
G k ——combined self-weight of foundation and weight of soil on foundation；
g k ——nominal value of the vertical linear distributed load transferred to ringwall top from bottom of tank shell；
M R ——Sliding resistant moment；
M s ——Sliding moment；
P k ——average pressure value at foundation bottom surface corresponding to nominal load combination；
P 0 ——additional pressure at the calculation bottom surface of tank foundation corresponding to quasipermanent combination of load effects；
S ——final settlement of subgrade；
Δ S i ′——settlement of No.ith stratum soil layer within the range of calculated depth；
Δ S n ′——Calculated value of deformation for the soil stratumΔ Z ，which is taken upward from the calculated depth.
2.2.2 Calculation indicators
E s i ——compression modulus of No.ith soil layer under the bottom of tank foundation；
E s0.1-0.2 ——compression modulus of subgrade soil under pressure at 100kPa-200kPa；
f ak ——characteristic value of subgrade bearing capacity；
f y ——design value of tensile strength of ordinary steel rebars；
γ c ——gravity of ringwall；
γ L ——gravity of service fluid stored in tank；
γ m ——average gravity of the packing material of each layer inside ringwall；
γ w ——Gravity of water.
2.2.3 Geometric parameters
A ——tank foundation bottom surface area；
A s 、 A s0 ——sectional area of circumferential rebars per unit height respectively of ringwall and outside ringwall；
b ——width of ringwall；
b 1 ——distance from the inner side of outside ringwall to the inner side of tank shell wall；
D t ——inner diameter of tank bottom shell；
H ——height from tank bottom to outside ringwall bottom；
h ——height of ringwall；
h L ——height from ringwall top to the maximum fluid(medium)level in tank；
h w ——height from ringwall top to the maximum water level in tank；
i ——slope；
R ——radius of center line of ringwall or outside ringwall；
R h ——inner radius of outside ringwall；
R t ——inner radius of tank bottom shell.
2.2.4 Calculation coefficients and others
K ——lateral pressure coefficient at ringwall；
α - i ——coefficient of average additional stress；
β ——coefficient of the width extended from tank shell into ringwall top；
γ ——component coefficient of self-weight of tank；
γ 0 ——Importance factor；
γ Qm ——component coefficient of the packing material self-weight in each layer inside ringwall；
γ Qw ——component coefficient of water self-weight；
ψ s ——empirical coefficient for settlement calculation.