Safety of Gallery in High Rockfill Dam on Thick Overburden Layer

被引：0
|
作者：
Feng R. [1 ,2 ]
He Y. [1 ]
Cao X. [3 ]
Guo L. [4 ]
Li Y. [2 ]
机构：
[1] State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan
[2] Pearl River Hydraulic Research Institute, Guangzhou
[3] Huaneng Lancang River Hydropower Co.，Ltd., Kunming
[4] Yunnan Technology and Business University, Kunming
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 05期
关键词：
crack; gallery; gallery structural joint; high rockfill dam; thick overburden layer;
D O I：
10.11784/tdxbz202108035
中图分类号：
学科分类号：
摘要：
Some foundation galleries in high rockfill dams built on deep overburden layers revealed that dam foundation gallery leakage is still a major problem. The gallery is a complex structure that connects the cutoff wall in deep overburden layers to the core wall in the dam body，and many factors affect its mechanical characteristics. Therefore，analyzing the failure mode，the main factors influencing the stress-strain behaviors，the influencing laws of the gallery and improving the design theory are important tasks. Based on the actual situation of the construction projects，the safety problems existing in the operation of the dam foundation gallery were analyzed. At the same time，to obtain a more reliable stress and deformation law for the gallery，this study establishes a gallery finite element calculation model that takes multiple influencing factors into account，such as the detailed simulation meshing，the creep of the concrete，and the contact between the gallery and surrounding soils. The calculated stress distribution of the gallery is consistent with the stress distribution reflected by the monitoring data. This proves that the approach can reasonably reflect the stress and deformation features of the gallery. The results showed that the tensile stress of the gallery concentrated near the junction of bedrock and overburden on both sides of the river，as well as at the top arch and bottom floor of the gallery. The failure of structural joints in the gallery was primarily caused by excessive opening deformation or dislocation，which was closely related to the position of the structural joints. The topographic conditions of the valley impacted the different crack forms near the two banks. Circumferential cracks were prone to appear on the side of the steep slope when the slope of the two sides of the overburden valley was quite different. On the side of the gentle slope，inclined shear cracks were common. And on the side of the gentle slope，the transverse tensile stress near the junction of bedrock，the tensile stress value and range on the bottom floor of the gallery are larger than those on the steep slope side. © 2023 Tianjin University. All rights reserved.
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页码：513 / 523
页数：10
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