Research On The Pile Anchor Support Structure Technology In Sandy Areas

In recent years, with the development of economy, the progress of the society, Pit excavation is more and more deep and excavated plane is more and more narrow. By the way of sloping excavation supporting doesn't accord with the actual.Only using the row pile self-weight and embedded depth supported form by excavation depth is limit.The effect to balance the pile under active earth pressure and ground load by passive earth pressure is not ideal.It is easy to generate large horizontal displacement on the pile top, and even cause the whole supporting structure finally. The pile retaining structure combines the technology used in thefoundation pit anchor system with the formation of pull-anchored pile is present in the sand areas, especially in a commercially reasonable support structur.At present, the computing method of tructure internal force displacement of the foundation pit are mainly static equilibrium method, equivalent beam method, elastic foundation beam method in the elastic supporting laws and so on.Static equilibrium method and the equivalent beam method are used to calculate the internal force, but they fail to consider the structure of the deformation, can not estimate the displacement of supporting structure. The static equilibrium method and the equivalent beam method can't satisfy people's attention for the deep foundation pit Surrounding effect. although elastic method can solve deformation problems which the traditional method can not reflect, there is some general limitations of in the elastic method. Such as m method has solved the deformation problem, but the intensity did not involves deformation problems, in addition, the soil resistance which m method calculate needed to determine whether the theory within the allowable range. Numerical simulation method which is a numerical solution,being developed with the With the development and application of the electronic computer in the last 3 to 4 years.It is an ideal value analysis that can not only solve the problem of soil strength but also solve the problem of the deformation, but the method is very strict with the The calculation model, constitutive relation, the calculated parameters an so on, cost big workload.Geotechnical parameters are ever-changing, the result of the simulation is limited to use in this project, so the calculated results are difficult to be extended to other projects. So nowthat how to more simple and accurate calculate Supporting structure of internal forced and deformation have been the major subject in the research of excavation engineering.This article uses theory analysis method to In-depth study the elastic method and equivalent beam method which are widely used in design support. For tracking and monitoring the horizontal displacement of pile top and anchor internal forces of a deep-foundation pulled anchored by pile retaining structurein in Shenyang and using FLAC3D engineering simulation software to simulate the process of excavation support, come to that support structure anchor is with arch shape deformation curve and have the characteristics of arch. Based on measured values to the scene and numerical simulation results to determine the value of the value m of sand strata issues and to amend the value of internal forces calculate by elastic method.This article has some reference value for designers on how to make a reasonable choice for supporting projects and optimize their designs under the premise of security and reliablility .