The Gray Prediction Research And Numerical Analysis Of Composite Soil-nailing Retaining Deformation

Soil-nailing retaining technology is one of the slope retaining technology which is widely used in foundation pit engineering,this technology has a good economic and technology advantage,and has achieved a good social effectBut because pure soil-nailing structure has some shortages during its using,it may not meet some needs of some engineerings,thus composite soil-nailing technology occurred which aimed at these shortages.Composite soil-nailing retaining technology is a retaining technology which is improved from pure soil-nailing technology,the way of improving is by adding auxiliary equipment and facilities in pure soil-nailing structure to improve its resistance strength,resistance moment and stability,enhance retaining effectAccording to many analysis theories and engineering practice,composite soil-nailing technology has a better feasibility and adaptability than pure soil-nailing technology.Composite soil-nailing retaining technology has a more various form than pure soil-nailing retaining technology,retaining effect has different diversities for their using and choosing forms.Nowadays the analysis on working principles,designing theories,structure stability and structure deformation development of composite soil-nailing technology are limited,study theory is immature.Engineering practice is popularly pulled ahead than theory study,enhancing the theory study of composite soil-nailing technology and combining theory analysis with engineering practice,perfecting related analysis and practice theory are helpful for the widely use of this technology.According to some research in and abroad,this article choose prestressed anchor bar composite soil-nailing retaining as project background,adopt the methods of theory research, field test,mathematical and numerical analysis to study the deformation tendency of composite soil-nailing retaining structure.Related jobs are done as follows:(1)Study the function mechanism and deformation regulation of composite soil-nailing structures,analyses inner reasons of structure deformation and the objectivity and inevitability of structure deformation development.(2)Pre-stressed anchor bar composite soil-nailing is chosen as a case,use gray prediction theory to analyses and predict the deformation tendency of structure,by modifying calculation model to enhance its prediction effect.Compare calculation result of every model to analyses deformation tendency of retaining structure.Wright related Matlab program to improve the computational efficiency.(3)Finite element analysis model is built to analyses the deformation regulation of pre-stressed anchor bar composite soil-nailing retaining structure,compare the gray model calculation results with finite element analysis results to analyses model rationality.(4)Verify and compare the related calculation model by means of project case analysis,provide theory and practice basis of deformation regulation research of composite soil-nailing retaining.