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Vacuum preloading numerical analysis methods

Author: MaQuanLing
Tutor: LiZuo；ZhangQiang
School: Tianjin University
Course: Hydraulic Engineering
Keywords: Preloading Consolidation theory Field Test FEM
CLC: U655.54
Type: Master's thesis
Year: 2009
Downloads: 101
Quote: 0
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Abstract


Tianjin Port is the largest port in northern China, not only shouldering the maritime transport, international shipping burden, but also bear in Tianjin and the Bohai Rim regional economic development leading role. With the economic and social development, Minato increasing demand for land, land reclamation is to ease the shortage of land resources and infrastructure needed this contradiction important way. Artificial land reclamation to form the foundation soil is characterized by poor quality of the project itself, and has a low-intensity, high compression resistance and other characteristics, in which the artificial reclamation muddy soil engineering properties even worse, almost Reclamation initial strength zero, while the hydraulic fill in the weight of consolidation under stress takes a long time. Therefore, under artificial reclamation silt and how soft foundation treatment method used, will affect how the implementation of land reclamation artificial key. Soft vacuum preloading is an effective method of reinforcement, engineering, rapid application development, while strengthening their Theoretical study clearly lags behind the engineering practice. This review summarizes the history of vacuum preloading technology development and research status, based on the combination of a large number of experimental data, theoretical analysis and numerical simulation of vacuum preloading soft ground deformation process variation of Turkey carried out in-depth study . Through the monitoring data analysis, mainly discusses the role of soil under vacuum preloading deformation mechanism; experimental basis in the field of vacuum preloading zone soil deformation characteristics were analyzed. Introduction and use of finite element software Plaxis actual engineering simulation and analysis using Mohr - Coulomb soil constitutive model to simulate the reinforcement of vacuum preloading mechanism and vacuum preloading soil consolidation deformation process. Simulation, using two ways for loading vacuum vacuum preloading load simulation results show that the vacuum loading results more in line with the actual vacuum preloading, and direct loading method error is large, can not reflect the the essence of vacuum preloading. Through the deformation characteristics of vacuum preloading simulation results show that the vacuum is applied load simulation results more in line with the actual situation, the maximum surface subsidence occurred in the reinforced area at the center of the settlement process and it fitted well with the measured data; equivalent external load The results showed that the lateral displacement does not comply with vacuum preloading of actual lateral displacement trends.

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CLC: > Transportation > Waterway transport > Port projects > Port construction > Various engineering > Foundation engineering
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