Research On The Application In Soft Soil Foundation Of Post-grouting Pile

Slurry protective bored pile in pile body around the pile of cement and soil and bored pile cement sedimentation down muck will greatly weaken the bored concrete pile and surrounding soil friction and pile end bearing capacity.Because the cement and soil of the pile will cause the initial stress of the pile and the pile side to be weakened,Can lead to stress relaxation and even initial stress is zero.Similarly,play the pile and mud from the bottom of the sediment will affect the bearing capacity of pile end.In this paper,the application of post grouting on the pile end of a transmission line is studied in this paper.The application of the post grouting in soft soil foundation is studied by the finite element method,The application of post grouting in soft soil foundation is studied by using finite element method,Through the analysis of the upper return height of the pile end grouting after grouting pile,And the effect of post grouting pile applied in different load on pile top settlement,To explore the influence of different soil stiffness on the settlement of bored pile,Focus on post grouting pile group effect,The effect of grouting group and the effect of grouting pile group are different,Compared with the ANDINA software group pile effect,using PLAXIS3 D to simulate the process.After simulation,this paper gets the following conclusions:(1)From the two-dimensional single pile simulation,three-dimensional single pile simulation and three-dimensional group pile simulation can be drawn: With the increase of the modulus of the pile,the settlement of the pile top is gradually reduced.(2)Slurry return height from 0.5m to 4m in that settlement with slurry return height increases gradually decreased,and in return height of up to 3.5 metres after the settlement amount tends to be stable,no longer with the increase of the height of slurry decreased.The corresponding from pile end average stress can also be seen when the slurry return height is increasing continuously,the pile end grouting pile of average stress decreased gradually,and the height of up to 3.5 metres after stress does not change,that after grouting in pile tip by force to,grouting reinforcement to the link of pile body and pile pile side soil,improve the end bearing capacity of pile and pile side friction resistance.(3)By comparing the ANDINA software and PLAXIS3 D analysis available.In the pile end grouting can effectively remove the effect of sediment on the bottom of the pile bearing capacity,thereby reducing side piles and piles of uneven settlement.With the cast-in-place pile with post grouting quantity and scope is more and more big,grouting pile from the middle of pile group gradually to around extension group angle of pile group,allof the grouting and all grouting contrast analysis available,when all the grouting internal piles and side piles settlement amount of difference significantly smaller,because all grouting,pile group pile end grouting can line between extinction group pile settlement and pile group x to the sideline and pile group y line on the sidelines of the settlement value the difference is getting smaller and smaller,and tends to be the same.The secondary stress,the stress between adjacent piles do not stack,reduce the pile group settlement butterfly.