ANALYSIS ON THE CAUSE OF VALLEY WIDTH SHRINKAGE OF AN ULTRA-HIGH ARCH DAM AND ITS INFLUENCE ON DAM SAFETY RISK

DOI

10.2991/iceesd-18.2018.148How to use a DOI?

Keywords

ultra-high arch dam; valley width shrinkage; dam foundation seepage; rock mass creep; temperature field

Abstract

To better understand the phenomenon of valley width shrinkage after the impoundment of an ultra-high arch dam, the cause and mechanism of the narrowing of valley width on both sides of the high arch dam during the impoundment stage are studied and analyzed. The effect of reservoir water pressure and bedrock temperature drop on valley width narrowing is found to be limited; after impounding, the change in the seepage field of the bedrock mass disequilibrates the pre-impounding natural stress balance of the intra- and inter-laminar dislocation band. The triggering of creep deformation of the rock mass is thereby a major cause of valley width shrink. The results of actual monitoring and feedback simulation analysis also confirm this deduction. Ultimately, the effect of valley width shrink on the overall displacement and stress of the dam is further analyzed. Suggestions are proposed for the strengthening of tracking observation analysis in the later stage, dam area expansion, and the observation range of reservoir deformation.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Qixiang Fan
AU  - Youzhi Liu
AU  - Guoxin Zhang
AU  - Heng Cheng
AU  - Jianfang Xiang
AU  - Qiujing Zhou
PY  - 2018/05
DA  - 2018/05
TI  - ANALYSIS ON THE CAUSE OF VALLEY WIDTH SHRINKAGE OF AN ULTRA-HIGH ARCH DAM AND ITS INFLUENCE ON DAM SAFETY RISK
BT  - Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018)
PB  - Atlantis Press
SP  - 810
EP  - 819
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceesd-18.2018.148
DO  - 10.2991/iceesd-18.2018.148
ID  - Fan2018/05
ER  -