Soft Soil Foundation Site Test And Numerical Simulation Of Pile-anchor Composite Structure

The pile-anchor reinforcement structure is a new type of slip resisting structure and it was applied developed from80s,20century, which is widely used in the reinforcement of slope. With the development of the supporting technology, it’s used in foundation pit supporting gradually. Because of the prestressed anchor rope need higher request for the anchoring force, so the application of the pile-anchor reinforcement structure in the soft soil foundation is less than other supporting structure. The structure in such aspects as the working mechanism of soft soil under the condition of research is still inadequate. The working mechanism of the pile-anchor reinforcement structure is still inadequate.According to the numerical simulation technique and engineering monitoring, the relationship between the pile-anchor reinforcement structure and the stability of soft soil foundation is studied in this paper. The main contents are as follows:The distributed optical fiber sensor technique is used in a soft soil foundation engineer for monitoring the stress and deformation of the pile-anchor structure. The deformation and working mechanism of the pile-anchor structure is studied. The optical fiber sensing technology is combined with prestressed structure, which provides a new method for prestressed structural monitoring.With the excavation of foundation, the active earth pressure will increase, the displacement of H-beam and the stress if prestressed anchor will be lager gradually. When it increases to a certain cetent, anchor will slip in the soil, which can’t provide appropriate anchoring force any more. The displacement of the pile-anchor structure without inner support will appear large fluctuation in the excavation process.The pile-anchor numerical calculation element is built according to the soil layer distribution of the soft soil foundation. The influencing factors for pile-anchor structure are analyzed, and fitting model for the cable length and safety factor with different cable inclination is studied. The stability of foundation is researched in the condition of lassen steel sheet pile and cement-soil.