Study On Reinforcement Technique Of Inclined Accident Pile

Because of the rapid development of urbanization in China,pile foundation is more and more widely used in the field of construction engineering,and the phenomenon of pile body tilting is becoming more and more.At present,the research of domestic and foreign scholars mainly focuses on the behavior of inclined pile and the bearing capacity of inclined pile.The methods include indoor model test,numerical simulation,field test,theoretical analysis,etc.At the same time,a lot of excellent research has been achieved The results are of great significance for reference.However,for the reinforcement technology of inclined pile,although there are many kinds of reinforcement methods in practical engineering,the most commonly used reinforcement methods in engineering such as filling pile,reinforcing pile core,strengthening soil around pile,increasing the stiffness of pile cap,But the reinforcement mechanism is basically in the blank stage.This obviously can not meet the needs of current engineering and theoretical research,nor can it reflect the stress mechanism and bearing capacity of inclined pile after reinforcement.As a result,the understanding of inclined pile is not enough to leave the hidden danger of safety,or the reinforcement design is too conservative to produce safety surplus.The material and manpower and material resources waste.So it is necessary to vertical inclined pile after reinforcement of inclined pile with certain angles and the different bearing capacity and load transfer law and other aspects of experimental research,and puts forward the effective reinforcement method,reduce the reinforcement scheme is too conservative and cause resources as well as human,material waste,or less due to the security risks of reinforcement in place and leave.In this paper,under the condition of vertical load loading,the vertical deformation behavior and load transfer law of inclined single pile under different reinforcement modes are tested in laboratory.The conclusion is compared with the deformation behavior and load transfer law of single inclined pile without reinforcement.There are four kinds of reinforcement methods,including vertical pile constraint,soilreinforcement around pile,reinforcement pile body and pile cap.Combined with theoretical analysis,the following conclusions can be drawn:(1)For the whole inclined pile with silty clay soil condition,when the inclined angle of the inclined single pile is the same,the failure form of the inclined single pile under different reinforcement modes is basically the same,and the failure of the pile body is caused by the excessive vertical displacement.(2)Under the same conditions,the reinforcement of soil around the pile and the reinforcement of pile cap are the most effective measures to limit the displacement of inclined pile.(3)Under the same condition,the axial force of the inclined pile body is the least,the soil around the pile is the second,and the position of the maximum positive moment and the maximum negative moment of the inclined pile in the course of load loading has nothing to do with the reinforcement method of the inclined pile.The bending moment of inclined pile strengthened by soil around pile is the smallest,and the moment of inclined pile after adding pile cap is the second.(4)Under the same condition,the change trend of the contact pressure between the inclined side of the pile and the deviated side of the pile is basically the same,and the contact pressure between the inclined pile and the soil reinforced by the soil around the pile is the smallest.In this case,the ultimate bearing capacity of inclined pile with pile cap is the largest,the soil around pile is the second,and the constraint effect of vertical pile is the worst.