Excavation Deformation Of Numerical Simulation

The excavation of foundation pit is a very important part in architectural engineering construction, it can protect the surrounding environment and control the soil deformation effectively, protect the security and stability of foundation construction, so the study in stability control of foundation pit excavation, the design of supporting structure and its functional mechanism is one of the most concerned problems of geotechnical engineering staff. This paper focuses on the numerical simulation analysis of a foundation pit engineering in Cixian, Handan about its pile-anchor retaining by using the MIDAS-GTS 3D finite element software, the analysis and research in the system of surrounding soil and retaining structure internal force and deformation, specific have the following several aspects:(1) This article elaborated and summarized the application of numerical simulation method on foundation pit design status and the foundation pit engineering in domestic, the research work and results of representative in the development of theory and practice in this field, it also introduced the research content and methods of this article, briefly expounded the main method of foundation pit supporting and related design theory.(2) The article introduced the construction environment of the site engineering geological conditions and the foundation pit engineering, using Lizheng deep foundation pit 7.0 version software for the foundation pit III unit support structure design, obtained the deformation of surrounding soil and soil pressure distribution, the supporting structure of the internal force and deformation, and the deformation monitoring was carried out in accordance with the relevant specification requirements.(3)The article briefly introduced the main characteristics of MIDAS-GTS software, modeling software operation process analysis function, material model, and taking a foundation pit project in Cixian based on MIDAS-GTS, establishing three-dimensional finite element model, analyzing the excavation of foundation pit under each working circumstance changes of stress, settlement and displacement, internal force of support structure distribution with the changes of the rules, some meaningful conclusions are obtained: before the excavation, the soil pressure in the same layer uniformly distributed, but with the excavation of earth pressure maximum migrated gradually to the bottom, its distribution in the excavation surface gradually showed the features of large middle and small ends, in the process of the excavation of soil shear stress values showed an overall increasing trend. Slope protection pile lateral soil pressure increased gradually as the excavation of foundation pit, the deformation gradually increased as well as the pile of shear force and bending moment, and the peak area of the two had certain coincidence, the coincidence position is in the area of approximately 0.6-0.8 times the depth of foundation pit from top to bottom. The axial force of anchor cable was evenly distributed in the free section, near the free section the anchorage section position will reach the peak, and after the peak it showed the gradual decreasing tendency along the deep soil.