Automatic three-dimensional displacement monitoring method for arch dam deformation

Abstract

The invention belongs to the technical field of displacement measurement and relates to an automatic three-dimensional displacement monitoring method for arch dam deformation. The method comprises the steps of dividing an arch dam into n sections, measuring a three-dimensional displacement value at the position of an end point of a first section, and monitoring the three-dimensional variation of the end point of each section, relative to the previous end point, so as to obtain the three-dimensional displacement value of the end points of all the sections according to a transfer principle. The method is simple and feasible, and convenient for engineering implementation, conforms to the practical engineering monitoring needs, provides an effective means for automatic three-dimensional displacement monitoring on the arch dam and overcomes the defect that the original measurement method only can monitor one-dimensional or two-dimensional displacement; in addition, the practical deformation condition of a dam body is combined, while the measurement effectiveness and the measurement precision are ensured, the corner parameter monitoring on a platform part of a measured part is cancelled, the measurement process is optimized, the measurement device is simplified, the measurement reliability is improved and the measurement cost is reduced.

Description

technical field [0001] The invention relates to an automatic three-dimensional displacement monitoring method for deformation of an arch dam, which belongs to the technical field of displacement measurement. Background technique [0002] At present, the displacement monitoring methods of arch dams mainly include the vertical line method, the bimetal pipe standard method, and the static leveling method. Among them, the vertical line is used to monitor the deflection (horizontal displacement) of a specific part of the dam body, and the bimetal pipe mark and static level are used to monitor the subsidence of a specific part. Due to the limitation of the structure of the arch dam, the number of vertical lines and bimetallic pipe marks that can be set in each arch dam is extremely limited, so that there are relatively few parts in the arch dam that can be monitored. As an instrument for subsidence monitoring, the static level can be installed in multiple places, but the instrume...

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Problems solved by technology

[0004] In addition, the Chinese patent number is ZL97214241.X, which discloses a three-dimensional deformation automatic tracking monitoring method of an arch dam. In this method, a helium tube is set between the two measuring points. The material of the helium tube is not specified, and the helium tube is filled with helium. Gas, the system transmits the laser in the helium tube, and the tube is not evacuated. This method cannot essentially solve the refraction error of the optical path generated during laser transmission.

Moreover, the helium tube is also used as a monitoring device for relative displacement changes at both ends, and this method is greatly affected by temperature.

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