The Research Of The Treatment Scheme Selection For The Soft Soil Foundation Of Road Engineering

With the large-scale construction of road engineering in China，the soft soil foundationsections will often arise in the engineering，Due to its shortcomings，such as high water content，high compressibility，large void ratio and so on，they would seriously affect the security andstability of the road．Therefore，the soft foundation treament is necessary and should be focus inthe road engineering project．And with the development of all kind of soft foundation treatmenttechnology，it provide the possibility for the engineering technical personnel to make thecomparison and selection of many scheme．However，the selection of the soft foundationtreatment scheme is actually a more influence factors analysis process，just judging by theengineering staff personal subjective experience alone，it is often difficult to choose the optimalsolution and has itself limitation and blindness．In order to select the optimal soft soil foundation treatment scheme，this article has carriedon the selection research of the road soft soil foundation treatment scheme，the main content is asfollows：Through a large number of data collection，this paper introduces the identification methodsof soft soil foundation，summarized the distribution and characteristics of soft soil，and discussthe purpose of the the soft soil foundation treatment should be performed to achieve．Throughthe summary and analysis of the various kinds of soft foundation treatment method，summarizedthe variety of soft foundation treatment methods in according to the depth range of softfoundation that these methods could treat，and discussed their principles and nature．Thenpreliminary formed the knowledge base of the commonly used soft foundation treatment methodof shallow，middle and deep，it can provide certain reference for the primary selection of softfoundation treatment scheme；Through analysed the relation between the various influencefactors of soft soil foundation treatment scheme，used the analytic hierarchy process to stratifythe various influencing factors and structure the analytic hierarchy structure model of the roadsoft soil foundation treatment scheme selection，then found the optimal solution by expert groupdecision．Combined with engineering case， according to the improved and optimization soft foundation treatment program，preliminarily selected the soft foundation treatment method fromthe knowledge base of the commonly used soft foundation treatment method of shallow，middleand deep；This paper preliminarily selected four schemes after preliminarily comparing eachscheme，they are the cement mixing pile，dynamic compaction replacement method，CFG pile，PHC pile；Through the analysis of various influence factors，used the analytic hierarchy structuremodel of the road soft foundation treatment scheme selection，structured hierarchical judgmentmatrix by the expert data，operated these judging matrix，after the weighted average for the totalorder value of the scheme level of each expert，got the order of the weight value of each scheme，it is the cement mixing pile，PHC pile，dynamic compaction replacement method and the CFGpile，the optimal solution is the cement mixing pile；Through the design，construction and qualityinspection of the cement mixing pile，it showed that the cement mixing pile which is the optimalscheme could achieve good treatment effect and meet the design requirements．...