Three-dimensional FEM Analysis and Back Analysis for Deformation Monitoring of Ertan Hydropower Station Chambers

Zhu Weishen; Wang Kejun; Zhu Jiaqiao; Dai Guangyi; Zhu Zuoduo

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Three-dimensional FEM Analysis and Back Analysis for Deformation Monitoring of Ertan Hydropower Station Chambers

更新时间：2026-06-25

- Three-dimensional FEM Analysis and Back Analysis for Deformation Monitoring of Ertan Hydropower Station Chambers
- Vol. 9, Issue 3, (1988)
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- Online First：23 July 2017，
  
  Published：1988
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Zhu Weishen, Wang Kejun, Zhu Jiaqiao, et al. Three-dimensional FEM Analysis and Back Analysis for Deformation Monitoring of Ertan Hydropower Station Chambers[J]. 1988, 9(3).
DOI：

Zhu Weishen, Wang Kejun, Zhu Jiaqiao, et al. Three-dimensional FEM Analysis and Back Analysis for Deformation Monitoring of Ertan Hydropower Station Chambers[J]. 1988, 9(3). DOI：

摘要

本文首先用应力函数法对二滩电站地下厂房区的着干地应力实测点进行拟合

给出了三维连续初始应力场。然后对三个大型洞室形成的厂房群进行三维有限元分析

得出了洞群围岩中破损区、应力弱化区及高应力区的分布

并就三维分析与二维分析的结果进行了对比。可以认为

二维分析不一定比三维分析更安全

因为三维分析得出的拉破裂范围更大些。文中还提出了一个用弹性有限元分析近似推求裂隙围岩破裂范围的方法。最后介绍在该现场的一个试验洞中进行围岩变形观测及反分析的结果

该反分析较好的验证了围岩力学参数及地应力测量的结果。

Abstract

Three-dimensional continuous field of initial stresses in Ertan site is determined with stress function approaching the date of a number of measurement points. Then a 3-d FEM analysis of a set of powerhouses with three large chambers is made

and the distribution of failure region

low and high stress areas in rock masses are obtained

which is compared with the results of 2-d FEM analysis. The results from 2-d analysis are not always more conservative than that from 3-d analysis

because the tension failure region from 3-d analysis is larger than that from 2-d analysis. A method to determine approximately failure area of jointed rock masses is also proposed in this paper. In addition

deformation monitoring of a testing chamber in site and its back analysis are presented. This back analysis demonstrates well the measurement results of mechanics parameters and initial stresses.

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