Method for predicting subsidence of soil outside pit based on differential evolution support vector machine

Abstract

The invention discloses a method for predicting subsidence of soil outside a pit based on a differential evolution support vector machine. The method comprises collection of the subsidence of on-site soil outside the pit, determination of a rough change rule of data to be a tangent curve, tangent fitting on subsidence data through differential evolution (DE), reasonable selection method of a scaling factor F and a crossover probability Cr of the DE, determination of a decision function of the support vector machine (SVM), simulation of generation of the subsidence data, evaluation and the like. The method comprises the following steps: through the DE, determining the basic form of a subsidence function for the soil outside the pit according to the subsidence data, and then performing parametric inversion; taking an obtained analytic function as the decision function of the SVM, and performing kernel function conversion on the decision function by the SVM; and finally, performing fitting prediction through the SVM, and detecting data conformity. Through the subsidence data of the on-site soil and the subsidence prediction simulation, curve fitting of the SVM is quicker and the prediction is more accurate; and the method can be widely applied to safety monitoring on foundation pit construction.

Description

technical field

[0001] The invention relates to the monitoring and prediction of the settlement of the soil outside the pit during the foundation pit construction in geotechnical engineering, in particular to the prediction of the settlement of the soil outside the pit by a differential evolution support vector machine algorithm. Background technique

[0002] With the large-scale construction of subway projects, the soil deformation caused by the construction process of various related subjects has received great attention. Foundation pits are one of them. The foundation pits of urban subways are often surrounded by many buildings and complex underground pipelines. If the degree of settlement is not predicted and discovered in time, serious consequences may result.

[0003] Many methods are currently used to analyze and predict foundation pit soil settlement, mainly including finite element analysis based on soil constitutive model, corresponding analysis based on input valu...

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