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Calculation method of safety factor of dam abutment based on full structural plane yield method

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

Active Publication Date: 2021-02-12
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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  • Calculation method of safety factor of dam abutment based on full structural plane yield method
  • Calculation method of safety factor of dam abutment based on full structural plane yield method
  • Calculation method of safety factor of dam abutment based on full structural plane 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 method for calculating the safety factor of a dam abutment based on the full-structure surface yield method, establishing a finite element model, performing initial stress calculation and static response analysis, and then obtaining the safety factor and the yield area percentage of the structural surface, and taking the safety factor as the The abscissa, with the yield area percentage as the ordinate, draw the yield area percentage-safety factor curve diagram of the structural surface, and then analyze the stability of the arch dam abutment. The solution method using the full structural surface yield analysis method of the present invention is more accurate and intuitive. It reflects the damage of the structural plane, avoids the influence of human factors on the value of the safety factor, reflects the actual working behavior of the dam abutment, and is more reasonable for the stability and safety evaluation of the arch dam abutment.

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 Patents(China)
IPC IPC(8): G06F30/23G06F119/14
CPCG06F30/23
Inventor 李晓娜
Owner XIAN UNIV OF TECH
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