NUMERICAL ANALYSIS OF INFLUENCE OF SOIL QUALITY ON SETTLEMENT OF EXISTING ROAD UNDER SHIELD TUNNELS
This paper tries to provide reference for the design of pile-anchor support for wintering foundation pit in practical engineering.In order to solve the wintering problem of pile-anchor support foundation pit,the anti-frost heave performance of this kind of foundation pit under negative temperature condition is studied.Considering the prestress,number of layers,spacing,and anchoring length of anchor bolt,the numerical simulation of pile and an-chor supporting foundation pit under negative temperature is carried out by using FLCA3D software,and the change law of pile side frost heave force and pile displacement is analyzed.The results show that the prestress of anchor rod has a significant effect on the horizontal displacement of pile,and the frost heave force of pile side increases,then de-creases,and then increases with the increase of the depth of foundation pit.The horizontal displacement of pile de-creases gradually with the increase of the number of bolt layers,while the frost heaving force of pile side increases gradually.The vertical distance of bolt has little effect on the horizontal displacement of pile and the freeze-heave force of pile side.The smaller the horizontal displacement of pile,the greater the freeze-heave force of pile side.The horizontal displacement of pile body and the frost heave force of pile side increase with the increase of anchorage length.The research results may provide guidance and reference for the design and application of pile-anchor sup-port over winter foundation pit.
wintering foundation pitpile side frost heave forcepile-anchor supportpile displacement