The basal stress of geotechnical triangular prism is studied. While it is impossible to get the analytical solution of basal stress distribution of geotechnical triangular prism

the approximate solution of basal stress distribution of geotechnical triangular prism is got with the Rayleigh-Ritz method. By comparison with different solutions of different slope ratios

different Poisson’s ratios

and different boundary conditions at the base

the results are drawn as follows. There is depression of basal normal stress on the base of geotechnical triangular prism. The steeper the slope is

the more depression of basal normal stress is. Much more depression occurs with the boundary condition of constraints on the base. Meanwhile

the value of Poisson’s ratio has little impact on the distribution of basal normal stress. The Poisson’s ratio mainly impacts the distribution of basal shear stress. The larger the value of Poisson’s ratio is

the larger the basal shear stress is. The slope ratio has large influence on the position and value of the maximum basal shear stress. The larger the slope ratio is

the larger the basal shear stress is

and the larger distance between the maximum basal shear stress and center of base is.