Basal heave stability assessment of retaining structures in cramped construction conditions: a calculation method

The article is dedicated to developing a calculation method for assessing the basal heave stability of retaining structures, which considers the boundary conditions at the extreme points of the shear surface profile and satisfies all three equilibrium equations. The object of research is a two-row sheet pile retaining wall under conditions of water filtration into the enclosing foundation. The immersion depth of sheet piles is determined by the condition of stability of the lintel according to the scheme of deep shear, as well as the condition of suffusion strength of the soil of the base. The form of the failure surface function and the stress function on the failure surface are described by degree dependencies to consider boundary conditions at the extreme points of the shear surface to satisfy Mohr's strength theory. The stability factor is obtained by solving a system of three equilibrium equations, considering the boundary conditions at the points of intersection of the shear surface profile with the profile of the base soil mass. The calculation with different variants of the interlock permeability of the top sheet pile wall shows that the sealing of the interlocks increases the stability of the retaining structures.