Analysis of active earth pressure of rigid pile composite foundation

In the rigid pile composite foundation that pile is long enough and is not more than 6 times the pile diameter, the internal shear force between pile and soil and under friction of the pile-soil interaction, the soil pressure in the top section of the pile only increased at a certain depth range, it decays rapidly with depth and axial force of top pile increases with depth in soil shear stress and friction. Based on this characteristic of the rigid piles composite foundation, when there is rigid pile composite foundation surrounding excavation and the excavation bottom is higher than rigid pile bottom, soil pressure on the retaining structure which is caused by the additional vertical stress of rigid pile composite foundation can be simplified as an inverted triangle; and the maximum earth pressure effect on intersection of the rigid pile top plane and supporting structure, as the depth increasing, the active earth pressure attenuates to zero. It is shown that the calculation method is consistent with the engineering reality.