A Range Of Guangzhou Metro In An Open Excavation Section Of Informative Monitor And Deformation Prediction

In recent years, with the rapid development of the progress of city construction, urban subway construction scale gets larger, in order to alleviate the phenomenon of less urban land, the number of basements, metros and other related underground engineering is sharply increasing. However, in the subway construction activities, there are more and more security risk problems, all kinds of safety accidents happen frequently, it causes lots of difficult to estimate losses and casualties. Therefore, it appears particularly important for underground excavation to proceed informative monitoring and deformation prediction. The research of the deep foundation pit enclosure structure deformation and the settlement of surrounding soils in foundation has been an important part of the research in subway foundation pit, it also plays an important role in information construction. Focusing on the two questions above can research by two ways: one is through the subway foundation pit enclosure structure deformation to monitor, monitoring data from settlement of surrounding soils are monitored displacement to analysis; Another is through three-dimensional finite element numerical analysis to analyze various periods of foundation pit enclosure structure deformation and subsidence displacement around the subway foundation pit, the two ways are relying on each other and mutual verification, in order to realize the informative construction and deformation prediction of the subway foundation pit.This article based on a range of Guangzhou metro in an open excavation section to informative monitor this project, gets the first-hand monitoring data. After sorting, inducting, and summarizing a large number of monitoring data, and on this basis, adopting research method of the large general three-dimensional finite element analysis software Midas-GTS to carry on the omni-directional analysis, obtains the displacement of excavation enclosure structure under various periods and the settlement of surrounding soils of foundation pit, the main research contents and research results are as follows:(1)On the basis of reading extensive documentation, based on a range of Guangzhou metro in an open excavation section, on account of the foundation pit informative monitoring technology carrying out research, combining with the relevant theory of informative monitoring, establishes informative monitoring system for open excavation section to monitor in real time in foundation pit practical situation, and feedbacks to foundation pit construction work through the analysis of the actual monitoring data.(2)Combining with the actual engineering projects, using large general three-dimensional finite element analysis software Midas-GTS to simulate open excavation section of foundation pit construction process, through the simulation analysis, can conclude displacement of the subway foundation pit enclosure structure in the various periods and the settlement of surrounding soils in excavation.(3)Through the finite element software analysis results compared with the actual project monitoring data to analysis together, verifies the accuracy of the numerical model, in order to predict the first reinforced concrete foundation pit demolish and support period of the foundation pit enclosure structure deformation and the settlement of soil around the foundation pit, to forecast the construction of foundation pit.