Analysis And Prediction Of Settlement Of Cement-Soil Pile Composite Ground In Hexi Areas Of Nanjing

As a new technique of the soft ground treatment,cement-soil pile is widely used in Hexi Areas of Nanjing recently. On the base of achievements on cement-soil pile,a further study is conducted on the mechanism of soft clay foundation treated by cement-soil pile, the characteristic is also explored.With probe in materials about design and construction, large amounts of data is obtained and processed to get every physical criterion of soil in Hexi Areas of Nanjing.At the same time,the details about the application of cement-soil pile are clearly understood.In addition,thirty buildings are chosen as the check samples for study.As the main point of this study,several calculating methods of cement-soil pile composite ground's settlement at present are sum up.A new method is recommended after analysis.Composite modulus method and pile compression method are used together to calculate the settlement of the enhanced area.Equal effect solid method is used to calculate the load on the under layer,then the method of summing of seperate layers is used to calculate the settlement of the under layer.In order to prove the accuration of this method,the thirty check samples' settlements are observed and surveyed ten years or so after their completing construction.By comparing the final settlements gained with the calculating results,the method recommended in this article is accurate and is fit for Hexi Areas of Nanjing.In addition,the method of using log curve to predict the settlement in any moment.And the method is proved accurate by being used in check samples.At last,the influence factors of the cement-soil pile composite ground's quality in Hexi Areas of Nanjing are analysed in the article,then some counter-measures are superficial proposed.