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| OPTIMIZATION OF SHIELD TUNNELING PARAMETERS BASED ON DYNAMIC BAYESIAN NETWORKS |
| DING Baojun,WU Xianguo,ZHANG Limao,ZHONG Jingbing,LIU Yang |
| (School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China) |
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Abstract To control the surface subsidence and minimize the negative influence from shield tunneling to surrounding environment,a DBN-based,parameters optimization method in shield tunneling was proposed according to the deficiency of the existing method and was applied to a shield tunnel in Wuhan,China. Firstly the main construction parameters were selected to optimize as node variables and the network structure was built. Then discretizing rules were set to divide the nodes states and measured data were discredited for parameter learning to get the complete DBN optimization model. After model validation with engineering measured data applied this model to parameters optimization. The results show that this model can reflect the inner link between the surface subsidence and shield construction parameters. Based on this model the optimal setting-range of each construction parameters can be determined and within the range construction parameters can be adjusted and optimized real-timely,which is helpful to reduce surface subsidence;This method is valuable in practice
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