Passenger Line The Status Quo Of The Red Clay Strength And Deformation Characteristic Test Research

With the rapid development of the economy in china, the construction in Midwest regions is quickening evidently, red clays is distributing aboard in these regions. Recently, many researchers mainly reported the causes, distribution and structure of the red clay, researchers on strength and the deformation properties reported little. It is important for us to study the physical and mechanical properties, characteristics of strength and deformation of the red clay so as to help the construction of roads and railways, to improve expansive soil foundation and to design the red clay slope.Based on the program of "Study on the dynamic stability and deformation properties of the red clay foundation form ballastless track passenger traffic railway , Hunan, China" (50778180) founded by the national science foundation and on the program of" experimental study on the subgrade deformation and stability of subgrade slope form limestone eluvium red clay of Wu-Guang express railway " (2005K002-B-2-1) founded by the national department of the Railway Ministry.The characteristics of strength and deformation of the red clay are studied, according to a series of experimentations in room, in-situ test, numerical analysis. The main achievements in this thesis can be obtained as follows.1. physical and mechanical characteristics, project characteristics and the relation of physical mechanics properties of red clay form Wuhan-guangzhou special passenger transport railway were studied through experimentations in room and theoretical research.2. The strength characteristics and influence factors of red clay were analysed. The transformation of strength index of Wu(han)-Guang(zhou) red clay is studied. The feature of the peak value strength and residual strength of red clay under different stations(original water content, cranny and above acting pressure) is recognized. The quantitative rules of the cohesion and soils angle of internal friction to original water content is developed. And the strength index performed for different methods of red clay is comparing analysed. 3. through experimentations in room and theoretical research, the stress-strain relation, consolidate deformation and shrink-swell deformation characteristics is studied. The cause of the axial strain, volume strain and consolidate deformation characteristics is analysed . And give the suggestions to deal with the shrink-swell properties of red clay.4. The finite element simulation about the deformation of the red clay in construction is given. The deformation behavior of the settlement and lateral displacement during the course of the constructions is researched. All these provide more data for the engineering construction in these red clay area in future.