Settlement Analysis On Reinforcing Soft Foundation With Plastic Drainage Board Preloading Method

Along with the development of country's capital construction, the engineering projects based on the soft soil are also developed rapidly. Before the structures are built in the area of soft clay, the settlement after construction completed is required definitely. However, in the existing design criterion, the calculation methods which base on one-dimensional consolidation theory can't take into account the additional settlement caused by the lateral displacement that generated by the plastical flow of the soft foundation. It leads the calculation final settlement to be less than the actual settlement which leads the settlement after construction completed to be on the big side, and affect the project's quality. So, it is possessed of great engineering meaning and theoretical value to improve the existing methods which are used for calculating the settlement of the soft foundation.Because of the complexity of the soft foundation, it is much difficult to calculate the additional settlement caused by the plastic flow accurately. So, the engineers often forecast the final settlement basing on the measured settlement data. Various previous methods after the loading is constant are summarized and classified into two categories: semi-math methods and pure-math methods, the common and difference among these methods is discussed. Then, by analyzing the characteristics of the process of the foundation settlement, the model for predicting foundation settlement based on "Law of Massaction" is put forward.This paper relies on the research of the section of the soft foundation of the Shen Zhen bay. Through analyzing the in-situ data such as total settlement, layered settlement and pore water pressure, the actual deformation behavior of soft foundation are mastered. After summarizing the methods of predicting settlement of soft foundation and bring forward a method to predict the post construction settlement of the surcharge preloading soft foundation. And the engineering application of the predicting foundation settlement based on"Law of Massaction"and the traditional predicting methods are compared, the results shows that the model is useable and it deserves more validation in more projects.