Parameters Optimization And Numerical Simulation Of The Pile-Anchor Supporting Of Foundation Pit Engineering In Henglong Square

With the increasing scale of urban high-rise buildings, subway construction, municipal engineering as well as the underground space development, the number of excavation engineering has increased dramatically in the recent10years. Meanwhile, Pile-anchor is widely used as an important support structure system in Shenyang region according to its great adaptability of engineering. However, the theory of the deep excavation pile anchor supporting design has some limitations. On one hand, in the actual design of foundation pit engineering, sometimes for security, design parameters are increased blindly, which causes an unnecessary investment waste. On the other hand, design parameters are expected to be decreased venturely for the pursuit of partial economy, resulting in reduce of control requirements such as the stability and the deformation of excavation, causing construction accidents and economic losses. Therefore, in this paper, the numerical simulation methods are utilized to optimize and design parameters of excavation support, and analyze the process of excavation stability, which serve as a reference for the rational design of excavation engineering and safety of construction.This paper regards the finite difference program of FLAC3D as a software platform and excavation engineering of Shenyang Henglong Square as a background, making a study on the stage excavation of deep foundation pit with the numerical simulation. The main contents are as follows:To study with, taking consideration into the construction conditions of Shenyang Henglong Square formation, a reasonable choice of excavation support methods is made, combined with the technology, economy, security and other related factors. Moreover, designing calculatation of the excavation engineering of Shenyang Henglong Square is performed. Afterwards, excavation parameters of pile-anchor by FLAC3D numerical analysis software are simulated and optimizated to analyze the influence of anchor prestress, anchor inclination angle, anchorage length, anchor length, pile diameter and the depth of the mounted pile on supporting structure. Next, orthogonal experimental design method is used to make optimization analysis comprehensively towards the above factors, and then to determine the excavation support optimization programs. Finally, to analyze the working condition of stability, numerical simulation method is applied. Thereby, comparison between the simulation data and the field monitoring data is carried out to draw the conclusion that both results are consistent basically.In summary, this study comes to the optimization parameters of excavations and the excavation deformation law during excavation of pile-anchor.