Screening method for pile-supported structures based on sacrifice rate of return

Abstract

The invention discloses a method for screening pile support structures based on sacrifice rate of return, comprising the following steps: step 1, constructing the feasible area of ​​foundation pit pile support structures; step 2, constructing a set of noise factors; step 3, using FLAC 3D The software simulates the excavation process of the foundation pit to obtain the system response results; step 4, calculate the robustness measurement index of the foundation pit pile support structure; step 5, calculate the cost of the foundation pit pile support structure; step 6, Draw the Pareto front according to the cost and the robustness measurement index; Step 7, apply the sacrifice rate of return to obtain the knee point of the Pareto front, that is, the optimal foundation pit pile support structure design scheme; the present invention passes Pareto Screening of points on the front edge weakens the influence of similar points on the selection of knee points, and multiple screening of knee points avoids falling into a local optimal dilemma. The present invention fits the shape and curve of the Pareto front when knee points are screened The dependence is small, and the screening results are 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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