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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 1    January 2018

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Effective stress law for rock masses and its application in impoundment analysis based on deformation reinforcement theory
CHENG Li(程立)1, LIU Yao-ru(刘耀儒)1, PAN Yuan-wei(潘元炜)2, YANG Qiang(杨强)1, LV Zheng(吕征)1

1. State Key Laboratory of Hydroscience and Hydraulic Engineering (Tsinghua University),Beijing 100084, China; 2. Schlumberger Technologies (Beijing) Ltd., Beijing 100015, China

Abstract:Reservoir impoundment is related to several hydraulic engineering concerns, including irreversible valley contractions, landslides and reservoir-induced earthquakes. However, these phenomena, such as valley contractions, are hardly to be explained by the conventional method. The scientific understanding of water effects during impoundment and their hazards to hydraulic structure are needed. The effective stress law for fissured rock masses is introduced in the elasto-plastic model employing the Drucker-Prager criterion and implemented in the three dimension (3D) nonlinear finite element method (FEM) program Three-dimensional FINite Element (TFINE). The slope deforms towards river-way during impoundment since the increasing pore pressure in fissures changes stress state and leads to additional plastic deformation in the rock materials. The value of Biot coefficient and the influence of water on rock materials are discussed in detail. Thus, the mechanism of slope deformation during the impoundment of Jinping-I arch dam is revealed, and the deformation is accurately measured. The application of the effective stress law provides a method to consider stress assessment, deformation evaluation and stability estimate of hydraulic structures during the impoundment process. This is a beneficial exploration and an improvement of hydraulic engineering design.

 

Key words: effective stress law; elasto-plastic FEM model; Biot coefficient; impoundment; valley contractions

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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