Dam deflection acquisition method based on finite inclinometer measurement points

Abstract

The invention discloses a method for obtaining the deflection of a dam body on the basis of measurement values of measured points of a limited inclinometer. Correlation vector regression with high generalization capability for small samples is adopted, measurement values of existing limited inclination angles are used as output variables, influencing factors such as coordinates of the measured points, the water level, the temperature, the pore pressure and the time are adopted as input variables, a correlation vector machine model is established, the tangent value of the inclination angle of an arbitrary spatial point on a measurement line at specific time is predicted, space coordinates are adopted for performing explicit optimal polynomial fitting on the tangent values of the inclinationangles on the measurement line, integration is performed on an optimal polynomial, and a tilt meter or the displacement measurement value of the top (such as an opening of an inclination measurementtube) of the measurement line of the inclinometer or the displacement measurement value of the bottom (such as the bottom of the inclination measurement tube) of the measurement line of the inclinometer is utilized to determine an integration constant, so that the horizontal displacement distribution (deflection) along the axis of an entire vertical inclination measurement hole is obtained. The measurement values of different time and space are simultaneously utilized, the influence factors such as external loads and the time and space are taken into account, and the method can be popularizedto other situations such as a slope, other projects of the slope and the horizontal layout of the measurement line.

Description

technical field [0001] The invention relates to a dam body deflection acquisition method based on measured values ​​of finite inclinometer points, and belongs to the technical field of structural deformation measurement. Background technique [0002] Structural surface or internal deformation is an important physical quantity for structural safety rating, calculation verification and scientific research. Therefore, horizontal displacement (deflection) or settlement is an important monitoring item in engineering safety monitoring. Many projects use vertical or horizontal inclinometers The distribution of the horizontal displacement on the vertical line or the settlement on the horizontal line is obtained by assuming a rigid body rotation between discrete measuring points. [0003] Taking deflection (horizontal displacement) as an example to illustrate, it can be extended to vertical displacement distribution. For deflection measurements see figure 1 , each measuring point i...

AI Technical Summary

Problems solved by technology

[0010] (1) It is assumed that each section is a rigid body rotation, but in fact there is an elastic deformation between each section. The assumption of a rigid body rotation is not rigorous in theory, and the error is relatively large, especially if the difference in elevation between the upper and lower measurement points is relatively large or the deformation gradient is relatively large. big time

[0011] (2) Time-space and load effects are not considered, that is, the influence of material creep and structural changes on deformation is not considered in time, and the correlation between deformation of each segment is not considered in space

[0012] (3) The above method can only obtain the relative displacement of the nozzle and the bottom, but cannot obtain a more absolute displacement

Images