Pile brace supporting structure screening method based on sacrifice yield rate

A technology of support structure and screening method, which is applied in basic structure engineering, excavation, instruments, etc., can solve the problems such as the influence of the safety performance of the parameter structure that cannot be truly reflected, the lack of consideration of similar points, and the improper handling of the head and tail points.

Inactive Publication Date: 2019-08-16
SHIJIAZHUANG TIEDAO UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, common methods to solve uncertain problems in geotechnical engineering include reliability method, safety coefficient method, etc. These methods usually only consider the influence of deterministic parameters on structural safety, and the average value of uncertain parameters is often taken during the design process , experience values, etc., resulting in design results that cannot truly reflect the impact of parameters on structural safety performance
[0003] In addition, in the existing calculations, the reverse angle method, the normal boundary method and the...

Method used

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  • Pile brace supporting structure screening method based on sacrifice yield rate
  • Pile brace supporting structure screening method based on sacrifice yield rate
  • Pile brace supporting structure screening method based on sacrifice yield rate

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Embodiment

[0102] according to figure 1 The flow shown screens the pile support structure design scheme for the open-cut foundation pit of Qingxiushan Station Hall of Nanning Metro, and determines the foundation pit pile support structure with the lowest cost and the best robustness. The specific steps are as follows:

[0103] Step 1, design the foundation pit pile support structure according to the layout form and depth of the bored piles, the concrete material used, the internal support form, the concrete type and the column layout form, and form the feasible area of ​​the foundation pit pile support structure;

[0104] The layout of bored piles is divided into Φ1200mm@1500mm and Φ1500mm@1700mm. The depth of bored piles is 35m and 40m. The concrete materials of bored piles are C35 and C30. Based on the foundation pit of bored piles There are 8 designs of pile support structure;

[0105] The internal support adopts the form of rectangular reinforced concrete internal support, and the c...

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Abstract

The invention discloses a pile brace supporting structure screening method based on the sacrifice yield rate. The pile brace supporting structure screening method comprises the following steps that 1,a feasible region of a foundation pit pile brace supporting structure is established; 2, a noise factor set is established; 3, FLAC<3D> software is utilized to simulate the foundation pit excavationprocess, and a system response result is obtained; 4, robustness measurement indexes of the foundation pit pile brace supporting structure are calculated; 5, the cost of the foundation pit pile bracesupporting structure is calculated; 6, a Pareto leading edge is drawn according to the cost and the robustness measurement indexes; and 7, a knee point of the Pareto leading edge is obtained by applying the sacrifice yield rate, that is, the optimal foundation pit pile brace supporting structure designing scheme is obtained. By screening points of the Pareto leading edge, the influences of the similar points on knee point selection are weakened, the knee point is multiply screened to avoid trapping in the dilemma of local optimum, dependence on shape and curve fitting of the Pareto leading edge is small during knee point screening is small, and the screening result is accurate and reliable.

Description

technical field [0001] The invention belongs to the technical field of foundation pit engineering rock and soil pile support structure selection, in particular to a method for screening pile support structures based on sacrifice yield. Background technique [0002] At present, common methods to solve uncertain problems in geotechnical engineering include reliability method, safety coefficient method, etc. These methods usually only consider the influence of deterministic parameters on structural safety, and the average value of uncertain parameters is often taken during the design process , empirical values, etc., resulting in design results that cannot truly reflect the influence of parameters on structural safety performance. [0003] In addition, in the existing calculations, the reverse angle method, the normal boundary method and the origin vertical foot method are used to optimize the design of the foundation pit pile support structure from the aspects of robustness an...

Claims

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Application Information

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IPC IPC(8): E02D17/04G06F17/50
CPCE02D17/04G06F30/20
Inventor 王景春林佳秀何旭升王炳华黄钟晖张世荣孟庆军杨磊李晓峰孙双喜何玉华
Owner SHIJIAZHUANG TIEDAO UNIV
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