Research And Application On Support Structure Of Deep Foundation Pit With Anchor Piles In Soft Soil

With the rapid growth of Chinese national economy, urban construction and utilization of underground space has entered a period of rapid development, they are confronted with deep foundation in the construction,Many scholars at home and abroad have done a lot in this area , however,deepfoundation works with complexity,uncertainty,and regional characteristics,there are many fields worth while to continue study and improvement.Therefore, the research of the supporting structure performance and the design of rational is a valuable subject.In this paper, combine Guangzhou Haixinsha Central Square foundation analysis, Zhongshan Wei hang ship factory instances, conducted deep foundation pit engineering theory in soft soil, field monitoring, excavation support FEM simulation, deep excavation deformation analysis etc, the main contents include the following areas:1. Summarized the research status of the deep foundation deformation and pile anchor support at home and abroad, described their analysis method, proposed the issue to be studied in the field.2. For the engineering properties of the Pearl River Delta region soft soil, analysis the influence of soft soil to deep excavation, and summarizes the working mechanism and calculation method of anchor pile support structure.At the same time the supporting dynamic effects to the change process were analyzed when deep excavation in soft soil.3. Combined with the theory of finite element, using the finite element software MIDAS-GTS established bored with the cable support structure of the finite element model,discussed the size of the prestress and the presence of anchor impact on the supporting structure, and analysis of soil parameters, bored pile embedded depth, bored pile stiffness, and other factors on the influences to support structure of internal force and displacement.4. Combine with practical work, consider the relationship between the cable and contact with the role of pile-soil ,using MIDAS-GTS analysis the internal force,displacement situation under anchor- pile deep foundation support structure in rich water, soft soil conditions.Through nuerical simulation and engineering test data comparison, the results agree well; At the same time analysis monitoring data of soft soil foundation under the oblique root pile and row pile supporting, discussed the feasibility of the method.