Study On The Deformation Of Slope Supporting Structure

In recent years, High-rise buildings and underground structures have sprung up all over the country, with the rapid development, a large number of deep foundation excavations and deep slope engineering have also emerged. However, the geotechnical engineering problems caused by these projects are looming large day by day. With the rapidly popularization and application of computer, most of the engineers and scientific researchers began to use numerical simulation theory and methods to analyze the deformation and stress of the supporting structure. In the simulation process, choosing the exact parameters of rock and soil mechanics is very important, which is the prerequisite to obtain ideal numerical simulation results. Due to the randomness and the limitation of sampling, the test method can’t fully reflect the nature of rock mass, which always lead to a large difference between the theoretical analysis results and the actual value. Afterwards, people began to make the attempt to use displacement back analysis theory to determine the parameters of rock and soil in foundation excavation and slope engineering, and get some achievements.Taking pre-existing analysis ideas and methods for reference, a three-dimensional model is established by using FLAC3D Software, and adopting the optimal displacement anti analysis of the golden section method as a basic method for displacement back analysis, this paper performed analysis on deep slope supporting structure deformation in Chongqing. The main work of this paper and conclusions are as follows:(1) Having arranged deformation monitoring data of construction of supporting structure in the first stage and analyzed the results of deformation, it shows the deformation of measure point S4 reaching 37.4mm.(2) A three-dimensional model is established by using FLAC3D Finite Element Analysis Software for the bigger deformation of work face, and put forward the inversion analysis process based on FLAC3D equivalent parameters of geotechnical. Combined with field survey data, calculated parameters of mudstone, and it concluded that the equivalent elastic modulus of mudstone is 0.658GPa, and the equivalent cohesion is 129 KPa.(3) Adopting FLAC3D to simulate and analyze deformation of supporting structure and ground surface settlement around in the first stage of construction, it shows that supporting structural deformation rate of early stage of construction excavation is relatively large. On later stage, as a result of accelerated anchor rod, the deformation of supporting structure was under effective control.(4) Considering safety, using modified model to simulate the deformation of supporting structure, the forecast result shows that the deformation continued to increase, up to 49.18mm when the construction was finished, and deformation revealed a regulation:the deformation of 1# pile was affected dramatically by 2# pile and 1# pile showed a phenomenon of parallel movement. Aiming at possible deformation of supporting structure on the second stage of construction, a optimization scheme of controlling deformation is proposed.