Pile brace supporting structure screening method based on sacrifice yield rate

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...

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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 origin vertical foot method are used to optimize the design of the foundation pit pile support structure from the aspects of robustness and economy to obtain a unique optimal solution. The methods all focus on the study of the graphic law of the Pareto front. As the ratio of the horizontal and vertical axes of the Pareto front changes, the results measured by the reverse angle method and the normal boundary intersection method will also change accordingly, and have similar Insufficient consideration of points, improper handling of first and last points, easy to fall into local optimum

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