Deep Foundation Pit Deformation Prediction And Its Practice

Accompany with the development of the city construction ,the buildings were builded higher and higher . As a result ,the building must have a durable basis, the foundation must be deep. But becanse of the foundation construction is very difficult and costs a lot of money with long period, the deep foundation construction is be paid more and more attention by the government and the engineers. How to make the deep foundation to be safety and how to optimizate the design are becomed focus. Many scholars have spended energy on it. Traditional slopal foundation thoery have many uncertain factors. Nowady, scholars consider the uncertains as indispensable factors in designs. The theroy as this becomes more and more popular.L use the finite element sofeware like MIDAS in the aricle below . it uses the modeling unite to set up an excavation project and the foundation support simulation established the jingyang projection in chengdu. It have simulated the horizonal displacement and the vertical dispalcement in different conditons. After that, we result back, and optimizate the design and decease the cost .we have get some conclutions from the simulations:â‘ After the excavation of numerical simulation technology, application of various excavation process complex stress status, analyzes the dynamic simulation in excavation pit deformation displacement in the process ,We get different construction process in the excavation and division, different anchor excavation Angle (15 degrees and 18 degrees), whether additional load (construction with no additional load under the condition of construction load), the size of the displacement deformation of foundation pit excavation projects for comparison, the qualitative analysis is done do scheme.â‘¡Finite element method to simulate the excavation process different anchor spacing (1.5 meters and 2 meters) of excavation displacement situations for engineering deformation amplitude analysis, reference, satisfying the decisions under the condition of construction safety, cost optimization.Meanwhile, based on the uncertainty of soil influence factors of actual engineering larger, numerical simulation is hard to the characteristics of foundation pit engineering quantitative analysis, and introduce the basic concept of grey theory, deep foundation pit slope system as a gray system of deep foundation pit bracing structure, the horizontal and vertical displacement establish GM (1, 1) model, the deformation of the simulation and forecast an effective. At the same time, this paper also attempt to introduce in the tunnel engineering used in Verhulst model, the deformation forecast to make of vigilance deformation, the maximum possible to quantitative analysis. For foundation pit warning to explore.The result show that : The grey theroy is very useful in the forcasting of foundation deformation . The development of the GM (1,1) have much more advantages than other medals, and the Verhust medal have a good performace in providing the warning values.