Studies On Plastic Drainage Technique And Its Applications In Improvement Of Soft Soil Deposits In The Reconstruction Project Of The Shenyang-Dalian Superhighway

The reconstruction project of the Shenyang-Dalian superhighway is one of the major large-scale construction projects in China. The controlling and reduction of road cracks with use of the new techniques and new materials is one of most important technical issues. Therefore the rational and economical improvement of soft soil deposits becomes particularly significant.Based on review an evaluation of a number of treatment and improvement technologies of soft soil foundation, the characteristics and principles of the plastic drainage method are examined in this thesis. The applicability of this method in the Shenyang-Dalian superhighway reconstruction project is also discussed.In order to find the most economical and rational technique used for improvement of soft soils in Shenyang-Dalian superhighway reconstruction project, three types of design schemes are proposed in the tests of silt river areas, i.e., the plastic drainage method, the powder spry piles method and direct-pavement method. After evaluating the observation results of post-construction settlements and deformations and settlement patterns of three individual treatment method are analyzed and then the most optimal and rational design scheme is determined to satisfy the engineering requests. Finally, the related design parameters are defined through analyses.