Deformation Analysis Of Foundation Pit With Pile-Anchor Supporting Structure Interacting With Soil

The deformation of foundation pit is not only related to the safety and stability of the foundation pit itself,but also related to the safety of the surrounding environment.Supporting structure plays an important role in controlling the deformation of foundation pit.pile-anchor support is widely used in foundation pit engineering because of its flexible layout,easy construction and strong deformation control ability.Based on the foundation pit engineering in Jiangxi Province,this paper analyzes and studies the deformation law of foundation pit and the factors affecting its deformation by means of numerical simulation software,and on the basis of this,discusses the deformation measures of controlling foundation pit.Finally,the interaction between supporting structure and soil was studied by ABAQUS software.Through research,the following main results have been achieved:(1)With the help of numerical simulation software,the deformation characteristics of pile-anchor retaining foundation pit are studied.The results show that with the deepening of the excavation depth,the horizontal deformation of the retaining pile,the surface settlement around the foundation pit,and the bottom of the pit will become larger.Deformation of retaining piles will eventually approximate the shape of "bow";the surrounding surface settlement is "groove" shape,and the position of groove will deviate from the foundation pit with the increase of excavation depth.Moving in the direction;the uplift of the bottom of the pit is always a small elastic bulge in the middle.(2)Simulated and analyzed the influence of relevant parameters of supporting piles and anchors on the horizontal deformation and surrounding ground settlement of foundation pit supporting structure.The research shows that the pile diameter and the depth of pile embedding have a significant influence on the deformation of the foundation pit;while the strength of the pile body has no obvious influence on the deformation of the foundation pit.The change of inclination angle in the range of 15 degrees to 25 degrees has little effect on the deformation of foundation pit,and the deformation of foundation pit over 25 degrees becomes larger and more significant.The value of anchor in the range of 15 degrees to 25 degrees is more reasonable to control the deformation;the application of anchor pre-stress can play a very good role in limiting the deformation of foundation pit.(3)Setting up the contact is one of the effective means to study the interaction between the supporting structure and soil mass.The friction coefficient of the contact surface is an important factor influencing the interaction between the soil mass and the supporting structure.With the increase of the friction coefficient,the constraint between the soil mass and the supporting pile is strengthened.(4)The deformation control measures of foundation pit are studied and discussed.The paper puts forward some measures such as paying attention to pre-exploration,selecting reasonable support piles and bolt parameters,strictly controlling soil excavation and supporting structure construction,attaching importance to monitoring and information construction.Finally,the flow chart of deformation control of pile-anchor support foundation pit is put forward,which has certain reference value for similar projects.