三峡二期围堰垂直防渗墙的应变形态

三峡二期围堰混凝土防渗墙的应力应变分析涉及到数值分析的接触算法,其难度不仅在于接触算法本身,而且在于土与结构的接触本构规律.以三峡二期围堰监测资料为依据,介绍了围堰防渗墙的应变、变形过程及规律,在假定防渗墙为弯压结构的前提下,给出了防渗墙应变与变形的关系,从而比较全面真实地给出了墙体典型断面的应变形态.该成果对于正确理解结构与土相互作用机理、分析数值分析接触算法的合理性具有参考意义.

Strain Status of Vertical Impervious Wall in TGP Stage-2 upstream Cofferdam

Structural numerical analysis for TGP Stages-2 upstream Cofferdam is a typical interaction problem of concrete structure and soil. The mathematical procedure on contact of numerical analysis used to analyze the stress and strain of concrete impervious wall, is involved. Its difficulty not only lies in procedure on contact itself, but also in contact constitutive regulation. In this paper, the process and rule of strain and deformation of impervious wall are presented based on monitoring data of the second stage cofferdam of the Three Gorges Project. The relation of strain and deformation is given on the assumption that impervious wall is a pressed-bending structure, which reflects strain state of typical impervious wall section veritably. This result is refered for correctly comprehending the interaction mechanism of concrete structure-soil as well as analyzing the rationality of the mathematical procedure on contact.