Testing And Analysis Of Mechanics Response Of Large-Scale Box Culvert In Loess District In Construction Using Top-Down Method

The case containing in xi'an is the project that adopts top-down method for the first time in loess district, the stability of the whole case containing distortion and the feasibility of the scheme are the primary problems which every design and constructor must face . Firstly, owing to the existing restriction with insufficient function while imitating the construction using top-down method of business software in common use, this text compiles three-dimensional finite element procedure of plasticity using the model of revisal Cambridge procedure, which better reflect the nature of soil and the force bore ;Secondly, utilizing the procedure compiled , the emulation analysis is used in the large-scale case, which study the responding law of the soil pressure around the case containing, the roof, sheet pile, wall and the floor with the progress of the construction in the course of the construction using top-down method and the distribution law of the stress in the real vehicle. Finally, through the monitoring and analysis of the case containing in the course of theconstruction using top-down method, the surveying mechanical responding law of the soil pressure around the case containing, the roof, sheet pile, wall and the floor with the progress of the construction further can be received. The combination of the result of emulation and the surveying result prove the exactness of the procedure of three-dimensional finite element compiled in this text and the result, further prove the dependability of the real result, and remedy the deficiency of the surveying result at the same time . The responding law and data offer the essential theory and basis used in the survey for the optimization and appraisal of the current scheme ,and for the design of large-scale case containing adopting the construction of top-down method in loess district.