Analytical Method Of Anchor Pulling Micro Steel Tube Pile And Application In Pit Engineering

As a new type of supporting structure, micro steel tube pile is now being widely used in deep foundation pit engineering for its significant advantages, such as strong application to the soil, flexible arrangement and convenience. However there is less study about the pile-soil interaction mechanism and influencing factors of the foundation pit deformation. The theoretical study is far behind engineering practice. It is still in lack of special calculating method and unified standard in design. It is difficult to meet the requirements of the safety and economic requirements of the deep foundation pit engineering only rely on the existing design theory and experience.Based on the finite difference method, FLAC3D can apply to the vast majority of the engineering mechanics problems, especially for elastic-plastic and large deformation analysis, rheological forecast and the numerical simulation of the geotechnical engineering construction. It has been widely applied both at home and abroad. This paper tries to build a new analytical method about the micro steel tube pile on the base of summarizing preceding study achievement, Relying on the project of the west section of underground garage in Broadcast&Television Center of Shandong Province, to predict the foundation pit stability under this kind of support form. Providing guiding suggestions for the design and construction of the project. Specifically, the main content of this paper is as follows:1、 The analysis method of the interaction of soil and micro pile is built based on the Interface model.2、 This analysis method is used in the deep foundation pit of underground garage in Broadcast&Television Center of Shandong Province. The lateral displacement and vertical settlement of the soil ae well as the distribution of the plastic zone and pile moment are obtained which can provide guidance suggestions on the design and construction of the foundation pit excavation.3^The sensitivity of micro pile supporting effect to the mechanical parameter of soil, the design parameter and material of pile, the prestress of anchor are analyzed and the main factor is obtained. Which can provide important guidance suggestions on optimizing and improving design of the micro pile supporting.