Analysis Of Settlement And Deformation Of Cement-soil Mixing Pile

When the natural foundation can't meet the requirement of engineeringconstruction, we must adopt some measures,one of which is to reinforce thefoundation. According to the principle of reinforcement, they can be divided intothe compaction method,displacement,composite foundation,adding tendons andgrouting etc.The purpose of ground treatment is to reinforce the foundation soil,to improve the engineering characteristic of the foundation soil, toincerase theshear strength of the foundation ,to lower the compressibility of the foundation,decrease settlement and differential settlement reduce of foundation. Thecement-soil mixing pile composite foundation is one of methods to the foundationimprovement,because of its low price,construction high speed,no noise and nopollution,etc..it is widely uded in varied projects and has its own comprehensiveprospect.But the investigation of theoretics the settlement of the compositefoundation behind of the practice, the researches of the mechanism are not wellknown.Aim at the analysis of settlement and deformation of the cement-soil mixingpile composite foundation ,the paper investigation on the following, and thedetailed contents is as follows:1. Expatiate the development and applied of the cement-soil mixing pilecomposite foundation.2.Analysis of computational theory and method of the cement-soil mixing pilecomposite foundation.include:(1).The explored of the existing cement-soil mixing pile composite foundationreinforced zone formula.(2)The explored of the existing cement-soil mixing pile composite foundationweak bleow layer formula.(3)Through the analysis of the formula,know:in the reinforced zone, compositemodulus is convenienced,and it be used usually in the engineering.it applied inthe calculate of the deep-mixing pile's settlement. Because of the difficulty of theconfirm of the bleow layer's top side's additional stress,the use of diffusion ofstress can be calculated of the bleow layer's top side's additional stressbetter.And use a material engineering to calculated the settlement of thecomposite foundation.3.Analysis of the deformation mechanism of soil and the theory ofconsolidationsaturation soil, expatiate two methods'use of finite element of thecomposite foundation reinforced zone.4.Combine a material engineering,use the software ANSYS of the finiteelement to simulate the composite foundation's settlement characteristic,knowthe result of ANSYS is approach to the real test result.Consider the model andparameter is in reason.5.In the base of the above, analysis of different length of pile and differentdistance of pile.Find the disciplinarian of the composite foundation's settlementand distortion in the different length of pile and different of pile'sdistance.konw:with the increase of the length of cement-soil mixing pilecomposite foundation's pile,the settlement is become minish,but when the pile isincrease into a range,the extent of the composite foundation'settlement becomeminish,we know there is a best length of pile.With the minish of the distance ofthe cement-soil mixing pile composite foundation's pile,the settlement is becomeminish ,but when the distance of the pile minish to a scope,the velocity ofsettlement of the composite foundation become stabilization,we know there is abest distance of the pile.Therefore design of the cement-soil mixing pilecomposite foundation should be controled in best length of pile and the bestdistance of the pile.Combine with this paper,the best length of pile should be in12m to 14m, and the best distance of the pile should be in 0.8m to1.2m.