Study On New Type Precast Pile Of Application And Influencing Factor In Retaining And Protection For Excavations

Now,precast piles have been used in many field.However,there are still many problems on retaining and protection for excavations with precast piles,and the development of new products is undoubtedly a way to solve these problems.Based on this background,this paper conducts experiments on retaining and protection for excavations of several new types of precast piles by means of numerical simulation,and compares and analyzes their effect of retaining and protection for excavations and influencing factors.The specific research results are as follows:1.Numerical analysis of prestressed centrifugal concrete hollow square pile,and study the influence of factors such as side length,inner diameter and pile spacing on retaining and protection for excavations.The results show that the larger side length and the smaller the inner diameter are have a positive effect on retaining and protection for excavations of hollow square pile,the factor of length have more effect on displacement and the factor of inner diameter have more effect on stress.2.Numerical analysis of soldier pile wall and PC-wall two kind of methods of PC-wall piles,and through the results to comparing with diaphragm wall and prestressed centrifugal concrete hollow square pile in soldier pile wall.The results show that the effect of PC-wall piles as soldier pile wall is similar of prestressed centrifugal concrete hollow square piles in the same size.As a PC-wall piles,the effect of retaining and protection for excavations is obviously better than hollow square pile in soldier pile wall,but not as good as the diaphragm wall of similar size.3.Numerical analysis of U-shaped pretressed reinforced concrete sheet pile,and study the influence of factors such as side length and wall thickness and angle on retaining and protection for excavations.The results show that the larger section height and wall thickness have positive effect on retaining and protection for excavations,and the effect of thickness factor is more obvious.The factor of Angle between the plane and the inclined plane can also take effect on retaining and protection for excavations,but the effect is small,should not do the main adjustment means to consider.4.By comparing all the pile types studied in this paper with some of the commonly used methods in retaining and protection for excavations engineering,analyzes the difference of effect and its characteristics,and can be use to provides reference for the design and selection of retaining and protection for excavations engineering in the future...