According to the execution situation of the project

the constitutive model of rock and soil and the seepage law of ground water are taken into account

a new mechanics model of the ditch is established

seepage and the stress field of foundation ditch in different working states are simulated by finite element method. Accordingly

some conclusions are drawn: during the process of excavation

deformation of the soil around the ditch occurs

the soil at the bottom of the ditch swells

at the corner

there exists a stress concentration

this point is a vulnerable area

it should be treated with caution. In addition

with the precipitation of the ditch

the deformation of the rock and soil around the ditch will increase gradually

this will affect the safety of the retaining wall and the building near the ditch

therefore

during the construction of the ditch

precipitation should be controlled cautiously.