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Dam abutment safety coefficient calculation method based on full structural surface yield method

A safety factor, structural surface technology, applied in the field of seismic stability analysis

Active Publication Date: 2018-03-27
XIAN UNIV OF TECH
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Problems solved by technology

When solving the safety factor, this method treats the sliding surfaces of the dam abutment that may slide and the dam foundation surface as the weak seismic part as the contact surface with Mohr-Coulomb characteristics. method, but the search for the sudden inflection point is the difficulty in solving the safety factor

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  • Dam abutment safety coefficient calculation method based on full structural surface yield method
  • Dam abutment safety coefficient calculation method based on full structural surface yield method
  • Dam abutment safety coefficient calculation method based on full structural surface yield method

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The present invention provides a method for calculating the safety factor of the dam abutment based on the yield method of the whole structural plane, and the specific steps are as follows:

[0020] Step 1, initial stress calculation: as figure 1 The abutment rock mass-foundation-dam finite element model is established as shown, and the initial stress calculation is performed on the finite element model. First, the self-weight of the foundation and abutment rock mass is calculated regardless of the self-weight of the dam body. At this time, the abutment rock The initial opening degree and initial slippage of the body structural surface are both 0, and the ground stress field under the action of the foundation's self-weight can be obtained through finite element calculation, and the stress on the contact boundary of the abutment rock ma...

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Abstract

The invention discloses a dam abutment safety coefficient calculation method based on a full structural surface yield method. The calculation method includes the steps that firstly, a finite element model is established, and initial stress calculation and static force response analysis are conducted; secondly, the yield area percentage of the safety coefficient and the structural surface is obtained, a structural surface yield area percentage-safety coefficient curve graph is drawn with the yield area percentage as the vertical coordinate, and then the stability of a dam abutment of an arch dam is analyzed. The solving method using the full structural surface yield analysis method reflects the damage condition of the structural surface more accurately and visually, the influence of human factors on the value of the safety coefficient is avoided, the actual working state of the dam abutment is truly reflected, and the stability and safety evaluation of the dam abutment of the arch dam is more reasonable.

Description

technical field [0001] The invention belongs to the technical field of seismic stability analysis, and in particular relates to a method for calculating the safety factor of a dam abutment based on the full structural plane yield method. Background technique [0002] The abutment stability of arch dams has always been the most critical issue in the research on the seismic safety of arch dams. The commonly used rock mass stability safety factors for arch dam abutments include overload safety factor, strength reserve safety factor and comprehensive safety factor method. The overload methods commonly used in the overload safety factor method include: super water load, super seismic wave peak acceleration, etc. Many scholars have used this method to conduct numerical and model test studies on various arch dams, but one of the many actions that the overloaded structure bears does not match the actual state. Because the actual anti-sliding strength of the structural surface of t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 李晓娜
Owner XIAN UNIV OF TECH
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