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Abstract The back analysis is made by means of the BP neural network algorithm on the mechanics parameters of surrounding rock masses in a highway tunnel construction project by NATM. The weight value matrices and tolerance vectors in accordance with input neurons and outputs can be obtained by training a set of specimens，which comes from a FEM analysis for a highway tunnel, the Pingshi Tunnel of the Beijing-Zhuhai expressway. The analogy results of the BP network produce a good agreement with the FEM calculations.
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Received: 01 November 2001
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