Of Highway Optimization Design Of The Treatment Program

At present, the study of soft clay foundation treatment in express highway still remains at local and decentralized treatment methods and effect assessment, while symmetrical study of optimum design is almost a vacuum. In this paper some judgement procedures and principles, which are used in optimum design, are attempted and innovated daringly. Technological and economic assessment principles are the kernel, while geological engineering factors ( crust stratum, character of soft clay, thickness of soft clay stratum, drain arenaceous layer and floor slope ), road property ( load conditions and regimentation of a section of a highway ) and construction conditions ( request of time limit for a project and construction obligations ) as the variables of optimum design and the restraining conditions, embankment stability and remainder settlement as the technological criteria. Then treatment plans can be chosen preliminarily. From these chosen plans in the same conditions, the total cost of each plan is concluded, at the same time influential factors such as construction time, construction quality control, technology credibility and environment impact are introduced. Each plan of soft clay foundation treatment is estimated synthetically for one certain treatment with fuzzy opinion and an oriental plan is chosed among the spare plans at the end.Aimed at some kernel problems about soft clay foundation treatment in express highway currently, the article puts up embedded discuss and provides optimum resolutions which are correlative to. At last, a combined composite foundation called "Sacked sand drain —X-style thin-wall pipe pile Composite Foundation" has been brought forward. Because the treatment hasn't been taken to the practice in project all the time, the theory of design isn' t perfect and the parameters need to be amended according to the actural treatment plan. So it is put forward as a cademic model. The theory and the construction technology need us to search ulterriorly, butthese can be given to the interrelative departments to consult.Through the research of optimum design about soft clay foundation of express highway in this article, some things are concluded mainly suah as:(1) X-style thin-wall pipe pile;(2) Sacked sand drain—X-style thin-wall pipe pile Composite Foundation;(3)Introducing optimum design procedures and fuzzy opinion to make sure the design of soft clay foundation more excellent;(4) From quantitative result of synthesis assessment, the optimum design plan can be obtained. And we should seek after ways and principles about the design of soft clay foundation of express highway actively, which accord to the situation of our country.