A device and method for measuring three-dimensional deformation inside a super-high earth-rockfill dam

Abstract

The invention discloses a device and method for measuring three-dimensional deformation inside a super-high earth-rock dam. Multi-ribbon stainless steel plates are buried inside the dam body where monitoring is required, and a vector line body is anchored in the center of the stainless steel plate; the downstream monitoring facilities of the line body are installed in the embedding dam body In the wedge-shaped combined observation room in the downstream plane; GNSS receiving antennas are installed on the roof, and biaxial inclinometers are installed at the four corners of the bottom plate to obtain the overall 6-dimensional displacement of the observation room; the upstream wall of the combined observation room is reserved for introducing vector lines The thread body is tensioned through the fixed pulley and hanging weights fixed in the observation room; the angle of the thread body is measured by the line body azimuth measuring device; the axial elongation of the thread body is controlled by the coaxial rotary potentiometer on the fixed pulley. The displacement meter measures and takes into account the temperature correction of the axial distribution of the wire body. The three-dimensional displacement inside the dam body is obtained by combining the measured value of the sensor with the three-level coordinate transformation. The invention has high measurement precision, good stability and high reliability.

Description

technical field [0001] The invention belongs to the technical field of hydropower engineering, and in particular relates to a device and method for actually measuring three-dimensional deformation inside a superhigh earth-rockfill dam. Background technique [0002] The internal deformation of ultra-high earth-rockfill dams during the construction period, initial storage period and initial operation period is relatively large, especially the settlement deformation. The existing internal deformation monitoring method separates vertical displacement and horizontal displacement monitoring, and uses water pipe settlement instruments and tension lines respectively. It ignores the coupling between horizontal displacement and vertical displacement, and directly takes the extension and contraction of the tension line horizontal displacement meter axis direction as the horizontal displacement of the upstream and downstream directions of the measuring point, and the approximation error ...

AI Technical Summary

Problems solved by technology

[0002] The internal deformation of ultra-high earth-rockfill dams during the construction period, initial storage period and initial operation period is relatively large, especially the settlement deformation. The existing internal deformation monitoring method separates vertical displacement and horizontal displacement monitoring, and uses water pipe settlement instruments and tension lines respectively. It ignores the coupling between horizontal displacement and vertical displacement, and directly takes the extension and contraction of the tension line horizontal displacement meter axis direction as the horizontal displacement of the upstream and downstream directions of the measuring point, and the approximation error is large, especially for super high Internal Large Deformation of Earth-rock Dam

In fact, the settlement deformation of the measuring point will cause the line body direction of the tension-type horizontal displacement meter buried inside the dam body to change, and it is impossible to always point horizontally to the downstream direction

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