To investigate the deformation behavior of loess in the typical “Y” shape long and narrow gully landforms

a series of one-dimensional consolidation tests are carried out indoor under high-pressure conditions. Test results show that the Gunary Model is better than the hyperbolic model or the exponential function to represent the relation between vertical compressive stress and vertical compressive strain of compacted Malan loess. Using secant modulus

the modified formulas of deformation of foundation with compacted Malan loess are constructed to calculate the deformation considering the variation of loading

water content and compactness. The relation of secant modulus and the reciprocal of water content is in the form of quadratic polynomial. The widely used linear relation formula of secant modulus and compactness K is not consistent with the actual situation. Research results have an important reference value to the design and construction of gully type high loess-content landfill projects.