Research In Stability Of Mid-long Pile Considered Shear Deformation In Soft Ground

Pile foundation is a widely use of the old basis.It has the capacity, better stability, distortion, etc.It can adapt to a variety of geological conditions and has been widely and rapidly used in project. But there is a certain lag in the research of pile, and how to analyze the stability of the pile with many loads is a practical significance. The current research on this issue at home and abroad are not many, and mid-long pile for soft ground which consider the stability of shear deformation has less coverage at home and abroad.The economy of China continue to grow,high rise buildings continue to create ,more and more piles are applied, the stability analysis has become a very real sense of engineering problems, but because of its complexity, it did not form a complete theory. But the "pile construction specification " uses a simplified form, and did not meet the applicable safety and reasonable and economic unity in some cases.In some specifications, they do not consider the buckling effect of a long pile in the soft ground, they apparently had some defects, the same specifications do not adequately consider the shear deformation.Therefore, to find a reasonable way to consider the buckling stability of mid-long piles in soft ground , and as it for the design and construction guidance, conducive to the structural and construction safety, but also will help control costs. Researching in the buckling stability of mid-long pile in the soft ground, due to its complexity, it seldom considers the impact of shear deformation, and sometimes to simplify the calculation, even ignores the shear deformation. To improve the buckling theory, the issue uses the elastic (plastic) analysis of internal forces and the stability of second-order internal force theory of the structure (pile structure) to study the effects of the buckling stability of shear deformation in soft ground .Therefore, to make up for deficiencies, the paper will mainly study the shear deformation which effect the buckling stability of a long pile in the soft ground. Under different circumstances, shear deformation of the extent of ignoring this problem will lead to much of the project problem. Through this research, we try to improve the stability of soft ground in the accuracy of long pile, and optimize the design and construction and save money, improve the safety of the construction.In this paper, "m" method is used to establish the physical model.It ignores the influence of some factors,by establishing the differential equation considering shear deformation and answering, gets the critical load. By useing engineering calculation software to form the chart, and it will be discussed to get the amount of shear deformation and the physical meaning of parameters involved.Through this research seeking to improve the rationality the stability research of the mid-long pile in soft ground and optimize the design and construction, which will help control costs and improve construction safety.It is a certain role in actual works, but ignores the more impact and its accuracy also requires a lot of engineering tests to prove it. Therefore, this paper proposed to only consider the effects of shear deformation of a entry point for future studies, it has some reference value.