Abstract
Treating weak saturated soil foundation by drainage powder jetting pile foundation can not only increase the bearing capacity of the foundation but also accelerate the drainage and consolidation process of the foundation. Having been commonly used in engineering, the plum blossom pile layout scheme is based on the foundation axisymmetric consolidation model (the powder jetting pile is the model center and the drainage board is located at the outer boundary of the model). It adopts reasonable boundary conditions and foundation seepage conditions and the method of pile-soil composite modulus and obtains the expression of the average excess pore water pressure of the composite foundation of the instantaneous loading of the drainage powder jetting pile under the simplified model. Therefore, the average consolidation degree of the foundation is acquired. The expression of the average consolidation degree can comprehensively reflect factors such as pile-soil modulus ratio, displacement ratio, drain spacing ratio, and those which affect the consolidation process of the foundation. The obtained analytical solution is of certain practical application significance for the consolidation settlement calculation of such engineering.
Highlights
In recent years, with the rapid development of engineering construction, the foundation treatment technology in China has presented a rapid development era and has brought considerable economic benefits
Drainage consolidation method and cement soil mixing method are the two methods most widely used in foundation treatment technology in China, but engineering practice clearly indicates that both have serious defects. e drainage consolidation method is mainly used in constructing the first high-speed railway in China
The use of a single cement soil pile to treat soft soil foundation is not enough to meet the needs of the current construction cycle
Summary
With the rapid development of engineering construction, the foundation treatment technology in China has presented a rapid development era and has brought considerable economic benefits. For the purpose of meeting the bearing capacity and deformation requirements during the construction and use period of the project, the combined composite foundation treatment technology (the combined treatment technology of vertical drainage body and cement soil mixing pile) has been widely used [3,4,5]. Lorenzo and Bergado [9] and Lorenzo and Bergado [10] reckoned that the excess pore water pressure of cement soil piles could not be assumed to be zero at any time during the consolidation process of cement soil pile composite foundation On such basis, they established the governing equation of cement soil pile composite foundation. Because of the complex foundation model of composite foundation, the research on consolidation settlement characteristics is difficult, and the theoretical results are far behind practice [18, 19]. erefore, it is of great significance to carry out the simplified study of consolidation settlement theory of composite foundation for improving the guiding role of engineering practice
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