A Construction Technology Study On Soft Soil Foundation Of Dongxin Express Highway

With further acceleration of China’s infrastructure development, the construction of express highway appears to be rapidly developed than ever before. The roadbed construction is a fundamental factor for express highway so that focus shall be taken on the quality control of the construction. The technology for the roadbed construction, particularly the technology for soft soil foundation, plays an important role in the roadbed quality control.The main content of this essay gives a details research on the soft soil foundation technologies including soft foundation treatments and blowing sand filling technology, in combination of the instances encountered in the construction of Dongxin Expressy Highway project. The study makes a comparison against foundation treatment methodologies and selects plastic drainage board pre-compression reinforcement method, based on the project feature, location, climate, geotechnical conditions, environment and Owner’s requirements. And the essay also give a detailed analysis and conclusion for the pitching and driving of plastic drainage board and placing of geotextile, as well as for the blowing sand filling technology in aspect of material winning, equipment selection, blowing sand filling procedure, subgrade drainage, settlement monitoring and protection works etc.As demonstrated in the project, the technology applied hereof is feasible and reasonable in the soft soil foundation construction. With the promotion and application of this technology, the safety, quality and schedule requirements have been met in Dongxin Expressy Highway project construction, and favorable economic returns and social benefits have been achieved. Therefore, the technology will provide a signification reference and valuable experience to similar projects to be implemented.