Rheological model suitable for medium-and-long-term settlement deformation behaviors of rockfill dam

Abstract

The invention provides a rheological model suitable for medium-and-long-term settlement deformation behaviors of a rockfill dam. The model aims to solve the problems that existing three-parameter, six-parameter and seven-parameter index rheological models each only have one exponential form for rheological convergence rate adjustment of the rockfill dam, and settlement change rules of the rockfill dam in the early stage and late stage of water storage cannot be reasonably reflected easily; a nine-parameter power function rheological model can well reflect the settlement change rules of the rockfill dam, but mathematical operation is complex. The combination index rheological model suitable for the medium-and-long-term settlement deformation behaviors of the rockfill dam is provided, and a finite element computational formula of the combination index rheological model is deduced. The rheological model can well reflect rheological deformation rules of the rockfill dam, and mathematical operation is convenient.

Description

technical field [0001] The invention discloses a rheological model suitable for medium and long-term settlement deformation behavior of rockfill dams, and is suitable for reflecting the settlement changes of rockfill dams. Background technique [0002] The measured data of rock-fill dams show that the deformation of rock-fill dams will gradually stabilize after several years of construction. Therefore, the rheological model that decays with time is generally used to reflect the rheological characteristics of rock-fill materials. According to the rheological test of rockfill materials, in the "Feedback Analysis of Rheological Deformation of Rockfill Dams" (Acta Hydraulics, 1998, 29 (6)), combined with the rheological test of the cushion material at the Northwest Port, three parameters (b, c,d) Exponential rheological model: [0003] ε(t)=ε f (1-e -ct ), ϵ vf = b σ 3 ...

AI Technical Summary

Problems solved by technology

Since the 3-parameter, 6-parameter and 7-parameter exponential rheological models all have only one exponential formula to adjust the rheological convergence rate, it is difficult to reasonably reflect the sedimentation change law at the initial stage of water storage and the later stage of water storage; although the 9-parameter power function rheology The model can better reflect the settlement change law of rockfill dams, but the mathematical operation is more complicated

At present, the rheological test of indoor rockfill materials generally lasts about one month, and the disadvantage of using an exponential formula to adjust the rheological convergence rate is not obvious.

Due to the inability to reasonably reflect the settlement change law of rockfill dams, it is impossible to accurately predict the void at the top of the panel and the overhead of the bottom of the wave wall caused by rheology in the later stage.

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