Safety evaluation of replacement reinforcement quality in abutment contact zones of ultra-high arch dam in first impoundment period based on prototype monitoring
Authors：Bo HU, Zhong-ru WU, Guan-biao LIU, Bin ZHAO, Bo XU
Department:
1. NARI Group Corporation, State Grid Electric Power Research Institute, Nanjing 210003, P. R. China
2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P. R. China
Journal：Water Science and Engineering,2012,5(2):219-229
Date：30 June 2012
Page number：219-229
Key words： ultra-high arch dam prototype monitoring compressive stress joint opening safety evaluation
Abstract：
Reinforcement quality evaluation at the abutment is an important research direction. Prototype monitoring and theoretical derivation were integrated to study the replacement reinforcement quality in abutment contact zones of the Xiaowan ultra-high arch dam. The principles of monitoring layout and design are introduced in detail. Prototype monitoring shows that the increment of the interfacial compressive stress is much larger in the impoundment stage than in the regulating stage. The water pressure and time-effect are two main factors affecting the interfacial stress. The time-effect is the key factor in the initial impoundment stage, and the water pressure is the key factor after impoundment. The contact properties are significantly improved by grouting. This study shows that there are three typical stages in the joint opening hydrographs, namely the compression stage, opening stage, and stable stage. There is a nonlinear relationship between the joint opening and temperature, which can be well described by the S-function. In conclusion, the reinforcement effect is satisfying, and the abutment is safe.

《水科学与水工程杂志》刊登
“基于原型模拟的超高拱坝坝肩连接区在第一次蓄水期改变加固质量的安全评估”
作者: Bo HU, Zhong-ru WU, Guan-biao LIU, Bin ZHAO, Bo XU
刊物：水科学与水工程杂志
期刊号：5（2）
时间：2012年6月30号
页码：210-218
关键词：超高拱坝，原型模拟，压应力，接缝开裂，安全评估
中文摘要：坝肩处的加固质量评估是一个很重要的研究方向。结合原型模拟和理论推导研究小湾超高拱坝坝肩连接区加固质量的改变。关于检测的布置和设计原则进行了详细介绍。原型检测显示分界面压应力增量在蓄水期阶段比在调节阶段的大得多。水压力和实践效应是影响界面应力的两个主要因素。实践相应在蓄水初期是关键因素，水压力在蓄水后期是关键因素。连接的性能主要是通过水泥灌浆改善的。本研究显示在接缝开裂曲线图中有三个典型的阶段，即压缩阶段、开裂阶段和稳定阶段。接缝开裂和温度之间存在一种非线性关系，这种关系可以由S型函数进行较好描述。总之，加固效果是满意的，坝肩就是安全的。

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