def ka_coulomb(a, b, fi, d):
'''Return the active earth pressure coefficient according to Coulomb theory.
:param a: angle of the back of the retaining wall (radians).
:param b: slope of the backfill (radians).
:param fi: internal friction angle of the soil (radians).
:param d: friction angle between soil an back of retaining wall (radians).See Jiménez Salas, Geotecnia y Cimientos page 682.
'''
fSoil = fs.FrictionalSoil(fi)
return fSoil.Ka_coulomb(a, b, d)
def kp_coulomb(a, b, fi, d):
'''
Return the passive earth pressure coefficient according to Coulomb's theory.
:param a: angle of the back of the retaining wall (radians).
:param b: slope of the backfill (radians).
:param fi: internal friction angle of the soil (radians).
:param d: friction angle between soil an back of retaining wall (radians).
'''
fSoil = fs.FrictionalSoil(fi)
return fSoil.Kp_coulomb(a, b, d)
def eq_coulomb(a, b, fi, d, p):
'''
Return the lateral earth pressure caused by a uniform load q
action over the backfill surface according to Coulomb's theory.
:param a: angle of the back of the retaining wall (radians).
:param b: slope of the backfill (radians).
:param fi: internal friction angle of the soil (radians).
:param d: friction angle between soil an back of retaining wall (radians).
:param q: Uniform load.
'''
fSoil = fs.FrictionalSoil(fi)
return fSoil.eq_coulomb(a, b, d, p)