The Application Of Supporting Technique Of Deep Foundation Ditch In The Construction Of Guangzhou Underpass

Excavation of foundation ditch is a complex problem of geotechnical engineering, which refer to intensity and stabilization. It must be reliable for roads and buildings around it and workers working in it. It is also refers to deformation. Deep foundation ditch project of underpass is more particularly. It limits the deformation of the foundation bottom and the soil out of the foundation ditch to assure the regular service of the buildings, the pipeline and so on around it. Besides, support structures are temporary structures, so considering the economic phase is important. Thus, the problem of how to engineering the foundation ditch which is safety, property and feasibility is an important issue that geotechnical project experts concern about inland and abroad.The illustration in this article is the foundation ditch support project of the Kecun underpass station in Guangzhou. It summary introduces the general development of the underpass, the develop level and theory of the foundation ditch support technology. It also concludes the method often used in foundation ditch support. Considering the hydrographic conditions of the third route of the underpass in Guangzhou deeper foundation ditch and complex environment around, also considering safety and economy, it calculates and compares several methods that are used in the underpass foundation ditch support. It obtains a better method adapt to the third route of the underpass in Guangzhou called artificial ditch, that is,Through the analyzing actual measurement data of the of the Kecun station, conclude the common characteristics and differ characteristics that changes of several pile bodies shifting variable with time. It also analyzes why it comes into being differ and the understanding of the temporal and spatial effect theory. Through the analysis of support axial stress actual measurement data compared with design numeric, adjust the design scheme of the support and yield good economic returns. At the same time, realize the importance of the construction monitoring, the construction monitoring put into effect in excavation process. Then feedback the information in time to master the soil body shifting in and out of the foundation ditch, to adjust execution parameter and to take optimum design or to adopt corresponding measure for safety and kilter of execution. The construction monitoring, one hand, checks on the design, another hand, be propitious to build-up datum to supply data for promoting engineering theory and construction technology. Foundation ditch engineering is a subject that needs moreexperience. If a mass of field actual measurement data do not to match with its execution work conditions, field monitoring only can direct field constructions and it does not work on checking and developing the engineering theory.