Dam abutment deformation simulation method based on volume force application

Abstract

The invention provides a dam abutment deformation simulation method based on volume force application. The dam abutment deformation simulation method comprises the steps of arranging horizontal deformation measuring points on a left dam abutment and a right dam abutment before dam pouring; monitoring horizontal deformation of all the measuring points in the direction perpendicular to the river to obtain actually measured deformation values of all the measuring points at different time nodes t; carrying out regional division according to topogeological conditions, and establishing a finite element grid model; based on the finite element grid model, applying a volume force to the left and right bank dam abutment rock masses at the moment t, and calculating a deformation value; adjusting the volumetric force of each region according to the error between the measured value and the calculated value to obtain the regional volumetric force smaller than the allowable error, and calculating to obtain the deformation value of the dam abutment at the t moment; obtaining a typical moment deformation value; and carrying out dam working state numerical simulation analysis by considering the deformation value at the typical moment. The dam abutment slope deformation can be accurately, simply and conveniently simulated, so that the influence of the dam abutment slope deformation on the working state and safety of the dam is accurately evaluated.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower, and in particular relates to a method for simulating deformation of a dam abutment based on body force application. Background technique [0002] In the design and analysis of arch dams, it is generally considered that the geological conditions are good, the abutment bedrock is stable, and the horizontal deformation in the direction vertical to the river is small. When the value is set to 0, the abutment only deforms under the loads such as water pressure, temperature and thrust of the arch end. However, with the impoundment operation of Xiluodu Arch Dam and Jinping I Arch Dam, etc., the deformation monitoring results of the dam abutment show that in addition to the deformation caused by the above loads, there are other large horizontal deformations towards the river bed, which will affect the dam. Impact on work performance and safety. [0003] The ideal simulation met...

AI Technical Summary

Problems solved by technology

However, with the impoundment operation of Xiluodu Arch Dam and Jinping I Arch Dam, etc., the deformation monitoring results of the dam abutment show that in addition to the deformation caused by the above loads, there are other large horizontal deformations towards the river bed, which will affect the dam. Impact on work performance and safety

[0003] The ideal simulation method for abutment deformation is to analyze and calculate the deformation mechanism of the abutment, such as toppling deformation, sliding deformation along the weak surface, and swelling deformation, etc. The reason is that the fine simulation is too complicated and the time is not allowed; the second is that there is often a big difference between the calculated deformation and the monitored deformation in the simplified simulation, and it is impossible to reasonably analyze the impact on the working behavior of the dam

Another deformation simulation method is to add a fixed displacement to the constraint boundary, and simulate the abutment deformation by changing the boundary displacement. The deformation law of the abutment rock mass obtained in this way is that the deep deformation is large and the shallow deformation is small, which is inconsistent with the actual monitoring deformation law.

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