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                     Statistical analysis of mechanical properties of dam foundation concrete cutoff wall


                                           WEN Lifeng,LI Yanlong,CHAI Junrui
                    (State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an  710048,China)


                   Abstract:Concrete cutoff walls are a well-established technique for forming seepage cutoff in pervious and
                   compressible foundations in newly constructed dams. This study investigated the behavior of cutoff walls on
                   the basis of statistical analysis. Firstly, this paper collected the monitoring data and engineering construc⁃
                   tion information of 43 cutoff wall cases for earthen dam built alluvium foundation,and established the case
                   database of the mechanical behavior of cutoff wall. Based on the case data, a detailed statistical analysis
                   of the horizontal displacement, crest settlement, relative settlement, stress characteristics and cracking be⁃
                   havior of the concrete cutoff wall is carried out. Combined with the loading characteristic and statistical
                   analysis, the statistical laws and formation mechanisms of the mechanical behavior were revealed. The ef⁃
                   fect of the position,depth,and material of the cutoff wall,the valley shape and the deformation character⁃
                   istics of the foundation on the behavior of the cutoff wall were further discussed,and the main factors af⁃
                   fecting the behavior were identified. This paper reveals the behavior of the cutoff walls from a statistical
                   point of view,which can provide a reference for the design and construction of cutoff walls.
                   Keywords: concrete cutoff wall; mechanical properties; statistical analysis; stress and deformation; influ⁃
                   encing factors
                                                                                   (责任编辑:韩         昆)

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