Applied Research Of Soil Nailing In The Coastal Areas Of Fujian

In the southeast coastal cities with the utilization and development of high-rise or multi-rise building and underground space,there are more and more deep foundating pit projects in practical engineer.Composite soil nail wall is a new-type base hole, it is widely used in the area where loose stratum, soft soil and water table are higher, the groundwater is abundant to be know at present, but the understanding that its work does performance and bears the weight of mechanism is not still very perfect.Composite with conventional bracing technology,not only soil nailing will actively support soil masses,but also the effect of soil nailing and soil nailing and soil mass will be mobilized leading to utilize in-site strength of soils to a maximam degree. The disturbed soil masses that originally induce loading effect on bracing structure are transformed into a part of barcing structure. Accoringly the composite soil nailing bracing techinique begins to applied to reinforcement of soft soils or foundations.But up to now, the working mechanism and stability study of the composite soil nailing bracing technique is still a blank.There is no corresponding calculation analytical method, design still mainly depends on experience. The behind schedule theories research obstructs the CSMW's further development. Studiting the mechnical of soil and nail on the basis of the forefathers studities, according to compound soil nail wall prop up research current situation and actual project.This text puts a kind of new steady checking computations method into in actual engineering design on the basis of the thing that forefathers study, and through the result of calculation of finite element simulation, the actual project surveys the materials, analyse that has summarized the soil of compounding to nail the wall and is deformed the characteristic and born the weight of mechanism. The thesis has summarized the complex soil and nailed the composition of the wall, structural form, compound to main project characteristic of structural form its soil construction method to nail wall and craft characteristic, and form that might be destroyed analyse at the same time. Study and compound the soil and nail wall deformation characteristic, rule of development of the internal force changing, destroying area in the course of constructing, summarize it and bear the weight of mechanism.In my opinions it should make difference between nail and soil anchor: soil nail is totally set up in displacement field of soil mass, and anchor main part it sets up to be zero range in displacement; Prestressing force could reduce displacement of...