À priori uplift pressure model for concrete dam foundations based on piezometric monitoring data

2020 ◽  
pp. 1-12
Author(s):  
Renato Pereira ◽  
António Lopes Batista ◽  
Luís Canhoto Neves ◽  
João Martins Casaca
Keyword(s):  
A Priori ◽  
Monitoring Data ◽  
Concrete Dam ◽  
Uplift Pressure ◽  
Dam Foundations

scholarly journals Intelligent Anomaly Identification of Uplift Pressure Monitoring Data and Structural Diagnosis of Concrete Dam

2022 ◽  
Vol 12 (2) ◽  
pp. 612
Author(s):  
Chunhui Ma ◽  
Tianhao Zhao ◽  
Gaochao Li ◽  
Anan Zhang ◽  
Lin Cheng
Keyword(s):  
Finite Element ◽  
Spatial Clustering ◽  
Arch Dam ◽  
Monitoring Data ◽  
Western China ◽  
Pressure Monitoring ◽  
Concrete Dam ◽  
Dam Foundation ◽  
Uplift Pressure ◽  
Structural Diagnosis

As an essential load of the concrete dam, the abnormal change of uplift pressure directly threatens the safety and stability of the concrete dam. Therefore, it is of great significance to accurately and efficiently excavate the hidden information of the uplift pressure monitoring data to clarify the safety state of the concrete dam. Therefore, in this paper, density-based spatial clustering of applications with noise (DBSCAN) method is used to intelligently identify the abnormal occurrence point and abnormal stable stage in the monitoring data. Then, an application method of measured uplift pressure is put forward to accurately reflect the spatial distribution and abnormal position of uplift pressure in the dam foundation. It is easy to calculate and connect with the finite element method through self-written software. Finally, the measured uplift pressure is applied to the finite element model of the concrete dam. By comparing the structural behavior of the concrete dam under the design and measured uplift pressure, the influence of abnormal uplift pressure on the safety state of the concrete dam is clarified, which can guide the project operation. Taking a 98.5 m concrete arch dam in western China as an example, the above analysis ideas and calculation methods have been verified. The abnormal identification method and uplift pressure applying method can provide ideas and tools for the structural diagnosis of a concrete dam.

Study on Determining Safety-Monitoring Index for Concrete Dam Based on Cloud Model

2012 ◽  
Vol 226-228 ◽  
pp. 1106-1110 ◽  
Author(s):  
Dong Qin ◽  
Xue Qin Zheng ◽  
Song Lin Wang
Keyword(s):  
Probability Density Function ◽  
Probability Density ◽  
Density Function ◽  
Cloud Model ◽  
Safety Monitoring ◽  
Monitoring Data ◽  
Concrete Dam ◽  
Deterministic Function ◽  
Monitoring Index

The paper, based on analyzing original monitoring data, employs forward and backward cloud algorithm in studying determining safety-monitoring index for concrete dam ,which integrates randomness and fuzziness into of qualitative concept of digital features. By means of above monitoring data, its digital characteristics can be easily transformed to the “quantitative-qualitative- quantitative” change. The final generated quantitative value constitutes the cloud diagram where each droplet demonstrates the characterization of raw monitoring data. At the same time, it also shows the randomness and fuzziness of monitored value. we can study out the safety monitoring indexes according to different remarkable levels by using the probability density function and deterministic function which completed by cloud algorithm. In the end, it is obtained with practice that this method is more suitable and reliability.

Application of Improved BP Neural Network Model in Uplift Pressure Monitoring

2011 ◽  
Vol 304 ◽  
pp. 24-30
Author(s):  
Yi Tao Mei ◽  
Dong Jian Zheng ◽  
Lei Xu
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Measured Data ◽  
Pressure Monitoring ◽  
Concrete Dam ◽  
Slow Convergence ◽  
Uplift Pressure ◽  
Monitoring Model ◽  
Actual Application ◽  
Bp Neural Network Model

The network structure, initial weights and initial thresholds were optimized to solve some problems, such as over-fitting and slow convergence rate in standard BP Neural Network. Combining the base seepage character of concrete dam, a uplift pressure monitoring model is established in this paper with measured data of a actual concrete dam . The advantage of the presented model is tested and validated by actual examples. It has positive significance in the actual application.

scholarly journals Study of the influence of temperature and water level of the reservoir about the displacement of a concrete dam

2016 ◽  
Vol 21 (1) ◽  
pp. 107-120 ◽  
Author(s):  
S.R. Oro ◽  
T.R. Mafioleti ◽  
A. Chaves Neto ◽  
S.R.P. Garcia ◽  
C. Neumann Júnior
Keyword(s):  
Water Level ◽  
Environmental Conditions ◽  
Canonical Correlation ◽  
Environmental Variables ◽  
Data Sources ◽  
Multivariate Techniques ◽  
Concrete Dam ◽  
Influence Of Temperature ◽  
Dam Foundations ◽  
Tank Water

Abstract Multivariate techniques are used in this study to analyze the monitoring data displacements of a concrete dam, measured by means of pendulums, extensometer bases and multiple rod extensometers, taking into account the action of environmental conditions, bounded by the surface temperature of the concrete at ambient temperature and the tank water level. The canonical correlation analysis is used to evaluate the influence of environmental variables in the displacement of structures and dam foundations. The factor analysis is used to identify data sources of variability and order the sensors according to the action of factors. The dates of the measurements are grouped according to similarities in the present observations, by applying the cluster analysis. Then the discriminant analysis is used to assess the groups as to their homogeneity. The results demonstrate that the techniques used for distinguishing the dam responses and identify the effects of changes in environmental conditions on the displacements of the structures and dam foundations.

scholarly journals Using Observational Method to Manage Safety Aspects of Remedial Grouting of Concrete Dam Foundations

2016 ◽  
Vol 34 (5) ◽  
pp. 1613-1630 ◽  
Author(s):  
Johan Spross ◽  
Fredrik Johansson ◽  
Lauri Kalle Tapio Uotinen ◽  
Jalaleddin Yaghoobi Rafi
Keyword(s):  
Observational Method ◽  
Concrete Dam ◽  
Safety Aspects ◽  
Dam Foundations

Calculation and Control of Seepage of Hardfill Dam with Different Foundation

2011 ◽  
Vol 255-260 ◽  
pp. 3666-3670
Author(s):  
Yun Feng Peng
Keyword(s):  
Drainage System ◽  
Dam Construction ◽  
Seepage Discharge ◽  
Seepage Field ◽  
Dam Foundation ◽  
Uplift Pressure ◽  
Calculation Results ◽  
And Control ◽  
Dam Foundations ◽  
Geologic Condition

As a new dam type, Hardfill dam has been arisen recently. The suitable geologic condition of t Hardfill dam construction was analyzed based on considering its characteristics in this paper; it was also studied how to choose the reasonable impervious and drainage system to control the dam body and foundation’s seepage on a given geologic condition to make sure the safety of the project. On the basis of analyzing the foundation geologic conditions of many common dam types, two kinds of typical Hardfill dam foundation were put forward. The seepage field law of dam foundation was analyzed by dam foundation seepage discharge, uplift pressure and seepage gradient of some typical positions after setting reasonable impervious and drainage measures on the two kinds of dam foundations. It is indicated by the calculation results that the adaptability of Hardfill dam foundation is comparatively nice, and the safety of dam foundation can be ensured if appropriate impervious and drainage measures are adopted.

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