A Simulation Method of Dam Abutment Deformation Based on Body Force Application

Abstract

The invention provides a method for simulating the deformation of the abutment based on body force, which includes: arranging horizontal deformation measuring points on the left and right abutments before the dam is poured; monitoring the horizontal deformation of all measuring points in the direction of the vertical river, and obtaining the time t at different time nodes The measured deformation values ​​of all measuring points; according to the terrain and geological conditions, the finite element grid model is established; based on the finite element grid model, the body force is applied to the left and right banks of the abutment rock mass at time t, and the deformation value is calculated; Adjust the body force of each region according to the error between the measured value and the calculated value to obtain the regional body force smaller than the allowable error, and calculate the deformation value of the dam abutment at time t; obtain the deformation value at the typical time; consider the deformation value at the typical time, Carry out numerical simulation analysis of dam working behavior. The invention can accurately, simply and conveniently simulate the deformation of the dam abutment slope, so as to accurately evaluate the influence of the deformation of the dam abutment slope on the working behavior and safety of the dam.

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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