Bearing Capacity of Hybrid Skirted Foundations in Silty Sand-over-Clay under Combined VHM Loading

Data Availability Statement

Acknowledgments

Notation

A

skirted foundation base area;

A_m

skirted mat base area;

c

cohesion;

D

skirted foundation diameter;

D_c

internal caisson diameter;

D_m

skirted mat diameter;

d_c

internal caisson diameter;

d_m

skirted mat length;

E

Young’s modulus of clay;

E_s

Young’s modulus of sand;

H_ult

uniaxial horizontal bearing capacity;

h

normalized horizontal capacity h = H/H_ult;

h₀

vertical bearing capacity factor in clay h₀ = H_ult/A_ms_{u,skirt tip};

k

inhomogeneity gradient of shear strength;

L

skirted foundation length;

M_ult

uniaxial moment bearing capacity;

N_ch

horizontal bearing capacity factor $N_{\mathrm{ch}}=H_{\mathrm{ult}}/A_m{\gamma }_s^{\mathrm{\prime }}{D}_m$;

N_cm

moment bearing capacity factor $N_{\mathrm{cm}}=M_{\mathrm{ult}}/A_m{\gamma }_s^{\mathrm{\prime }}{D}_m^2$;

N_cv

vertical bearing capacity factor $N_{\mathrm{cv}}=V_{\mathrm{ult}}/A_m{\gamma }_s^{\mathrm{\prime }}{D}_m$;

m

normalized moment capacity m = M/M_ult;

m₀

vertical bearing capacity factor in clay m₀ = M_ult/A_mD_ms_{u,skirt tip};

m_h=0

normalized moment capacity at h = 0 m = M/m_h=0;

RP

reference point;

s_u

undrained shear strength;

s_u0

undrained shear strength at mudline;

s_umc

undrained shear strength at sand–clay interface;

T_s

thickness of the sand layer;

t

thickness of the foundation wall;

u

horizontal displacement;

V_ult

uniaxial vertical bearing capacity;

v

normalized vertical capacity v = V/V_ult;

v₀

vertical bearing capacity factor in clay v₀ = V_ult/A_ms_{u,skirt tip;}

w

vertical displacement;

z

depth below mudline;

γ′

effective unit weight;

${\gamma }_c^{\mathrm{\prime }}$

effective unit weight of clay;

${\gamma }_s^{\mathrm{\prime }}$

effective unit weight of silty sand;

θ

rotation angle;

κ_c

sheer strength nonhomogeneity, κ_c = kD_m/s_umc;

υ

Poisson’s ratio;

φ

friction angle; and

ψ

dilation angle.

References