Calculation Method of Earth Pressure in Adjacent Building Foundation Excavations Considering Finite Soils

Abstract:

Based on the limit equilibrium method， force balance equations of the soil were established to derive the theoretical solution of soil pressures for soils with finite width. Then， the effect of factors， such as the width-height ratio of the soil， soil cohesion， internal friction angle of the soil， and wall-soil friction angle on soil pressure， was investigated. By analyzing the key factors affecting the inclination angle of soil failure， a simplified formula for calculating the soil pressure behind wall was developed. The results indicate that under the condition of the finite soil width， the forces on the front and back of soil wedges at the same height are basically the same. The internal friction angle of the soil significantly influences the soil pressure， while the impact of the soil cohesion and wall-soil friction angle is relatively minor. The inclination angle of soil failure varies approximately between the angles calculated by Rankine and Coulomb theories. Moreover， the wall-soil friction angle and the internal friction angle of the soil have significant effects on the sliding surface angle and the calculation range of finite soil pressures.