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Dam online monitoring

Dam online monitoring

As of 2016, China has built more than 87,000 dams of various types of reservoirs, playing an important role in economic construction and social development. However, due to people's influence on natural forces (such as floods and earthquakes), material properties, structural mechanisms (such as structural instability mechanism), construction control (such as concrete temperature control, filling density), and man-made damage, etc. The understanding of factors is not sufficient. At present, the operating age of many dams has reached 30 to 50 years. Some dams have even exceeded the design service period, and there are serious safety risks. In order to allow these hidden dangers to be monitored in a timely manner, urgently needed to be effective. Monitoring measures to ensure the safety of the reservoir dam.


Monitoring projects and distribution


监测内容

监测仪器

布设要求

表面位移监测

表面位移传感器

观察横断面通常设在最大坝高或原河床处,合拢段、地质突变处、地质条件复杂处、坝内埋管及运行有异常反应处

内部变形监测

导轮式固定测斜仪

观测断面应布置在最大横断面及其他特征断面(原河床、合龙段、地质及地形复杂段、结构及施工薄弱段等)上,一般可设1~3个断面。每个观测断面上可布设13条观测垂线。

浸润线监测

孔隙水压计



观测横断面宜选在最大坝高处、合龙段、地形或地质条件复杂坝段,一般不得少于3个,并尽量与变形、应力观测断面相结合。


应力应变

内埋式应变计

面板混凝土应变观测,各测点的观测仪器应成组布置,并位于同面板平面平行的同一平面内。一般布置二向仪器组,其中一个顺坡方向,一个水平方向,二者夹角90°

水位监测

投入式水位计



测点宜设置在水面平稳、受风浪和泄流影响较小、便于安装设备和观测的地点;岸坡稳固处或永久性建筑物上;基本能代表坝前平稳水位的地点


土压力监测

土压力盒

观测断面的位置应同坝内孔隙水压力、变形观测断面相结合,土压力观测断面上的测点,一般可布设2~3个高程,观测断面内每一测点处的土压力计

雨量监测

雨量计

雨量计布设坝体周围的一个相当空旷的位置,便于收集雨量


Monitoring system layout

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Surface displacement monitoring

The surface displacement of a reservoir dam can be monitored by a GPS monitoring system combined with a surface displacement sensor. The GPS monitoring system uses the navigation and positioning signals sent by the GPS/BeiDou satellites to perform space resection surveys to determine the three-dimensional coordinates of the ground to be measured; the surface displacement sensors monitor the displacement and deformation of the dam surface in real time, through triggering acquisition or real-time acquisition. Use wired/wireless long-distance network to transmit real-time data to the monitoring center to timely understand the development of displacement and deformation of the dam body.


Internal deformation monitoring

The internal deformation of the dam is monitored by a guide wheel fixed inclinometer. After the guide wheel fixed inclinometer connecting rod is connected, it is installed in the corresponding position of the inclinometer with guide groove to monitor the internal deformation of the dam and judge the possible risk in time.

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Immersion line monitoring

In order to ensure the stability of the dam, it is necessary to monitor the seepage line of the dam. During the monitoring, the water level pipe was buried in the dam body, the pore water pressure gauge was placed in the water level pipe, the water level in the pressure pipe was monitored in real time, the infiltration surface was drawn, the change of the water level in the dam body was determined, and the safety of the dam body was evaluated by combining theoretical analysis.

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Water level monitoring

It is mainly used to monitor the change of the water level of the reservoir in real time, especially during the rainy season and production discharge in the flood season. The real-time monitoring of the water level data in the reservoir area is used to guide production, and it is used in conjunction with other monitoring systems for comprehensive analysis, such as rainfall. The impact of the situation on the water level of the reservoir area, such as whether the change of the water level in the reservoir area has significant influence on the saturation line.


Rainfall monitoring

The rain gauge is placed at a location around the dam body to obtain rainfall in the reservoir area, because rainfall is also an important influence on the safety of the dam. If heavy rain is reduced, certain measures must be taken.

What would you like to do?

Understand the work products.

Vibrating string reinforcement meter, vibrating string surface/embedded strain gauge,

Learn about application scenarios

Bridge, tunnel, highway slope, municipal foundation pit, subway rail transit, reservoir dam,