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| Research on Prediction of Foundation Pit Deformation and Safety Control Based on Neural Networks |
| ZHENG Zhi—bin，LIU Yong，LIU Ji—Yao，ZHAO Zhi—tao |
| Beijing Municipal Engineering Institute，Beijing 100037 China |
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Abstract Research purposes: The foundation pit deformation threats the safety of the foundation pit and surrounding buildings and structures．Application of neural networks in prediction of the foundation pit deformation in advance and giving alarm is a new way to control the risk．
Research conclusions: The neural networks can effectively predict the deformation and stability of the deep foundation pit in advance．and the stability based on which a judgement call be made on the stability of the deep excavation．The prediction value is much more closed to the measured value by using time series as an input layer．This shows the time series method can reflect the internal non—linear relation between the deformation of bracing structure of foundation pit and the time．In practice，the transfer of construction processing sequence can induce a sudden change of the measured value of the deformation．However，the big deviation of the predicted value from the mesaured value may result from ineffective training due to the small sample range of neural networks．
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Received: 12 October 2009
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2010, Vol. 27 
