So far

there are two kinds of ways to research soil pressure theory. One is based on limit equilibrium theory and another is based on semi-numerical & semi-analytical method. Classic theories of the soil pressure are obtained by the former

in which soil is regarded as elastomer

rigid-plastic or elastoplastic material. The invalidation of soil is judged by the Mohr strength envelope. In this way

the complex problems become simple. But the theoretical values of soil pressure are different from the actual values. However

for the soil pressure theory based on semi-numerical & semi-analytical method

the function expressions combine with numerical analysis successfully. In contrast with limit equilibrium theory

the later comprehensive considers the distortion of soil

the construction time and the strength index of soil

which make the calculation value of soil pressure in accordance with the actual value. In a word

the semi-numerical & semi-analytical method starts to become new way to research soil pressure.