Bazhong Reservoir in Sichuang Province, as one of China 172 national major water conservancy projects in water saving and water supply, has transferred from the construction stage to the operation stage from 21 June to 22 June, 2022. The reservoir comprehensively strengthens flood control and has become the first major water conservancy project in the upper reaches of the Qujiang River. It plays important roles on irrigation, flood control and water supply. The total estimated investment of the project is 3.189 billion RMB.

Slope Monitoring in Reservoir

During the construction of water conservancy projects, to ensure the safety and stability of buildings, it is necessary to excavate the mountains, which will form artificial slopes. After the slope is excavated, there will be relaxation tension crack, creep deformation, collapse, landslide and other phenomena. It takes a long time for the mountain to adapt to the changes of its internal force. In natural state, the slope is stable. Artificial cutting or blasting will destroy the internal stress structure of the mountain and redistribute the stress. As a potential unstable block, there is a possibility of instability. Slope cutting or support measures are required to meet the stability of the mountain. Therefore, slope monitoring is very necessary.

Figure: excavation in slope of reservoir

In addition, the rise and fall of the reservoir water level will have an impact on the corresponding slope. The water level in the reservoir area falls, and there are hidden dangers such as landslides and road collapses around the reservoir area. To ensure the life and property safety of the people along the reservoir, it is very necessary to monitor the slope of the reservoir. As an important means to master the slope dynamic information, ensure the construction safety, analyze the instability mechanism and carry out the slope safety early warning, nowadays slope safety monitoring has played a very important role in slope engineering. 

Figure: water level of reservoir fell

Purpose of Slope Monitoring

The main purpose of slope monitoring is that using the slope monitoring information to study the development trend of slope deformation, predict the possible danger precursors, and assess the safety of the project. Slope stability has always been a difficult problem in water conservancy and hydropower projects. Slope monitoring provides an important basis for stability evaluation, design feedback, on-site construction guidance and safe operation.

Figure: slope monitoring layout in reservoir

Monitoring Device: Huasi Array Flexible Inclinometer

Huasi Array Flexible Inclinometer is a flexible and standard 3D measurement system. The principle of array flexible inclinometer is to reflect the angle between the corresponding axis and the gravity direction by measuring the data of gravity acceleration in different axes through the accelerometer, and calculate the displacement of the corresponding length rod through the change of the angle.

It can be bent freely and can be installed in vertical, horizontal or Arc. It’s widely used in real-time monitoring projects such as slope sliding, tunnel convergence, road subgrade settlement, building construction,etc.

Figure: Huasi array flexible inclinometer

Figure: flexible inclinometer installed in Bazhong reservoir

Monitoring Early Warning Cloud Platform

The data monitored by the flexible inclinometer is transferred to the Huasi monitoring early warning cloud platform through the 4G network. The monitoring early warning cloud platform has the functions of real-time acquisition of monitoring data, cloud integrated processing, diversified chart display, professional correlation analysis, disaster early warning alarm, report statistics and reporting. It can manage multiple projects and equipment at the same time and provide reliable, real-time and comprehensive information services.

Figure: Huasi monitoring early warning cloud platform

Installation Site of Monitoring Device

Huasi monitoring early warning system has strongly supported the construction of comprehensive prevention and control system of Bazhong reservoir. It helps to improve the geological disaster early warning and prediction, improve hidden danger identification and geological disaster prevention ability.  With Huasi monitoring early warning system, the accuracy, timeliness and coverage of geological disaster early warning also have been greatly improved.

ASSOCIATED PRODUCTS

                Flexible Inclinometer                                             Data Logger                                                                      Monitoring Cloud Platform

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