坝基混凝土防渗墙力学性状的统计分析

Statistical analysis of mechanical properties of dam foundation concrete cutoff wall

混凝土防渗墙是透水和可压缩坝基渗流控制的主要措施。本文从统计分析的角度研究坝基混凝土防渗墙的力学性状。首先收集了43个已建土石坝工程坝基防渗墙实例力学性状监测资料和工程建设信息,建立了防渗墙力学性状实例数据库。在分析防渗墙受力特点的基础上,基于实例资料,对混凝土防渗墙的水平位移、顶部沉降、覆盖层和防渗墙的相对沉降、防渗墙应力特性及开裂性状开展详细的统计分析,揭示了不同力学性状的统计规律和产生机理。在此基础上,进一步讨论了防渗墙的位置、深度、材料以及河谷形状和地基变形特性对墙体力学性状的影响规律,识别影响防渗墙力学性状的主要因素。本文从统计角度揭示防渗墙的力学性状,可为防渗墙的设计和建设提供参考。

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.