Currently

the simplified analysis for the deformation response of adjacent piles by excavation has seldom considered the influence of supporting action

especially the geotechnical influence caused by the rainfall environment. Based on the stratified hypothetical Green-Ampt model applicable to different rainfall conditions to simulate the rainfall infiltration process

a two-stage method was proposed to analyze the interaction between the excavation and the adjacent pile under the influence of rainfall. In the first stage

considering the influence of soil unloading

retaining

and supporting of excavation

the Mindlin solution was used to analyze the additional stresses in the soil at the adjacent pile foundations caused by the excavation of the foundation pit under the rainfall. In the second stage

based on the Pasternak foundation model

the interaction between pile foundations and soil was explored to obtain the horizontal deformation response of single piles and groups of piles under the influence of rainfall with the rainfall duration. The monitoring data from existing engineering were compared to the theoretical calculation results with good agreements. In addition

the parameters of rainfall (rainfall intensity

saturated permeability coefficient

initial water content

matric suction) and pile (boundary conditions

brace stiffness

pile diameter

excavation depth

distance between piles and foundation pit) were analyzed to investigate the influences on pile deformation. The results show that the proposed theoretical method can better reflect the deformation response of foundation excavation on adjacent pile foundations under the rainfall. The rainfall has a significant influence on the deformation of the adjacent pile

and the sensitivity of rainfall parameters is as follows: rainfall intensity > initial water content > saturated permeability coefficient > matric suction. With the increase of the rainfall duration

the development depth of the wet front continues to increase

and its development rate shows a gradual weakening law until it approaches the saturated permeability coefficient. The displacement of adjacent piles caused by the excavation becomes larger and larger

and the change rate of the top displacement first gradually decreases and then converges to a specific value. The smaller the support stiffness and pile-excavation distance

the greater the influence of rainfall duration on piles. The influence of rainfall duration on piles with different pile diameters is basically the same. The greater the excavation depth

the greater the influence of rainfall duration on piles.