Effect of in-situ curing of joint composite foundations on pile-loaded adjacent pile foundations
The construction of road and bridge foundations causes the deflection and lateral displacement of existing bridge piles,and in severe cases,it may lead to major collapse accidents.Based on on-site engineering experiments,a new method of in-situ solidification combined with composite foundation reinforcement for the impact of road construction on adjacent bridge piles was proposed,combined with the numerical model to analyse the effect of in-situ solidification depth,elastic modulus of solidified soil and other composite foundation related factors on the protection of adjacent pile foundations.The results show that the reinforcement depth of the mixing pile is about 1.5 times the pile length,and the construction of the plain concrete pile will produce the maximum horizontal displacement of the passive pile at about 0.75 times the pile length.The in-situ solidification(2.0 m)and cement mixing pile method(1.8 m)can greatly reduce the shallow horizontal displacement of passive piles and protect the safety of bridge piles.When the cement content of the solidified soil is between 5% -7% ,and the cement content of the cement mixing pile is within the range of 12% -18% ,increasing the cement content has a significant effect on reducing the horizontal displacement of the passive pile.At the same time,replacing the ordinary cushion layer cement mixing pile with in-situ solidification+cement mixing pile composite foundation reduces the maximum negative bending moment of the pile body by nearly 16.6% .
soft foundation treatmentengineering experimentnumerical simulationcomposite foundationin-situ curingpassive pile
万方数据
维普
