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High-core-wall rock-fill dam deformation parameter inversion method

A technology of parameter inversion and rockfill dam, applied in image data processing, instrumentation, calculation, etc., can solve the problems of large instantaneous deformation parameters, uncalculated creep deformation, low inversion efficiency, etc., and achieve accurate inversion analysis Effect

Pending Publication Date: 2020-05-29
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to: provide a kind of high-core rockfill dam deformation parameter inversion method, solve two disadvantages in the traditional high-core rockfill dam deformation parameter inversion analysis method: one is a large number of finite element calculations The problem of low inversion efficiency is caused; the second is that in the finite element calculation of inversion analysis, the creep deformation is not calculated, and the instantaneous deformation is compared with the monitoring value to optimize the inversion parameters, resulting in the instantaneous deformation obtained by the inversion The problem of too large parameters

Method used

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Experimental program
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Effect test

Embodiment 1

[0059] A method for inversion of deformation parameters of a high core rockfill dam, comprising the following steps:

[0060] S1: Combined with the geological profile and deformation monitoring layout of the core rockfill dam, establish a three-dimensional finite element model of the core rockfill dam, and arrange nodes at the corresponding positions in the finite element model according to the buried position of the settlement instrument;

[0061] S2: Carry out parameter sensitivity analysis, that is, select parameters sensitive to deformation from several mechanical parameters of materials to obtain parameters to be inverted;

[0062] S3: Use the uniform design method to design the parameter samples to be inverted;

[0063] S4: Input the parameter samples to be inverted obtained in step S3 into the three-dimensional finite element model established in step S1, perform finite element calculations, and obtain deformation value samples;

[0064] S5: Standardize the deformation...

Embodiment 2

[0071] A method for inversion of deformation parameters of a high core rockfill dam, comprising the following steps:

[0072] S1: Combined with the geological profile and deformation monitoring layout of the core rockfill dam, establish a three-dimensional finite element model of the core rockfill dam, and arrange nodes at the corresponding positions in the finite element model according to the buried position of the settlement instrument;

[0073] S9: Determine the inversion period according to the deformation characteristics of the core rockfill dam;

[0074] S2: Carry out parameter sensitivity analysis, that is, select parameters sensitive to deformation from several mechanical parameters of materials to obtain parameters to be inverted;

[0075] S3: Use the uniform design method to design the parameter samples to be inverted;

[0076] S4: Input the parameter samples to be inverted obtained in step S3 into the three-dimensional finite element model established in step S1, ...

Embodiment 3

[0083] This embodiment is a supplementary description of Embodiment 2.

[0084] The modified Shen Zhujiang model is used in the first inversion period.

[0085] Revise the Shen Zhujiang model, as shown in formula (1-1).

[0086] ε(t)=ε 0 +ε f (1-e -αt ) (1-1)

[0087] where ε 0 , ε f are the instantaneous deformation and final creep deformation, respectively, and the final creep deformation is decomposed into final volume creep and final shear creep, as shown in formula (1-2) and formula (1-3).

[0088]

[0089]

[0090] where σ 3d is the limit value of volume creep that decreases or increases as the stress level increases, and the test parameters of the creep model are α,b,c,d,m 1 ,m 2 ,m 3 , the total creep is assumed by Prandtl-Reuss, and the total strain rate tensor can be expressed as formula (1-4).

[0091]

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Abstract

The invention discloses a high-core-wall rock-fill dam deformation parameter inversion method, and relates to the technical field of high-core-wall rock-fill dam monitoring. A proper inversion time period is selected, a response surface method is adopted to construct a target optimization function, a simulated annealing algorithm is introduced to iteratively optimize the target optimization function. The method can be used for inversion analysis simulation of the deformation parameters of the high-core-wall rock-fill dam, and a technical support is provided for more accurate numerical simulation. The two defects in a traditional high-core-wall rock-fill dam deformation parameter inversion analysis method are overcome: 1, the problem of low inversion efficiency caused by a large number of finite element calculations is solved; and 2, in inversion analysis finite element calculation, creep deformation is not calculated, and instantaneous deformation is taken as total deformation to be compared with a monitoring value for inversion parameter optimization, so that instantaneous deformation parameters obtained by inversion are relatively large.

Description

technical field [0001] The invention relates to the technical field of monitoring high core rockfill dams, in particular to an inversion method for deformation parameters of high core rockfill dams. Background technique [0002] Rockfill dams are earth-rockfill dams that use rocks, sand and gravel, etc. as the main materials, and are thrown or rolled. The dam body is composed of rockfill and anti-seepage body as support, transition layer and reverse filter layer between them. The soil core wall can be connected with the vertical and horizontal anti-seepage systems in the dam foundation. Therefore, the rockfill dam with the soil core wall as the anti-seepage body can be built on a deep cover layer, which is a commonly used dam type for high and medium dams. [0003] In the development of hydropower in western my country, many high-core rockfill dams under construction and have been built are located in complex terrain and geological environment, with large loads and high str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20
CPCG06T17/20G06T2210/04
Inventor 郭琴琴陈建康吴震宇裴亮李艳玲张瀚
Owner SICHUAN UNIV
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