Kriging Method Based Optimization Analysis Of Anchor Frame Pile Anti-Slide Structure On Bedding Rock Slope

Bedding slope is a common engineering geological problem in the construction of mountainous highways.It has caused a lot of damage and has a great impact on engineering safety,therefore,the research on the formation mechanism of bedding rock slope and the proposal of reasonable management measures are particularly important.In practical engineering,the reason for the success of many slope controlling cases is that the emergency capacity factor coefficient is too big,the design is too conservative,which will lead to higher engineering cost and result in additional waste.According to the above problems,this paper takes the typical section of Fufengshi Expressway as an example,analyzes the reinforcement effect of anti-slide system of the combination of anchor framework beam and pile on K27 bedding slope,optimizes the minimum engineering cost of control measures based on the premise of safety assurance,and gives an optimal design proposal.The main research work and achievements are as follows:(1)Through field investigation,engineering geological drilling and indoor experiment,this paper analyzes the formation mechanism of K27 bedding slope.The special stratigraphic structure of interbedded mudstone and sandstone constitutes the basic condition of slope instability.Under the external factors such as rainfall and human engineering activities,the slope is unstable.Based on the comprehensive analysis of slope failure mode and slope failure site condition,it is determined that the failure mode of K27 bedding slope is bedding-slip failure.(2)K27 bedding slope is a bedding rock high slope.Under the condition that single treatment measures cannot meet control requirements,this paper puts forward the anti-slide engineering design scheme of anchor framework beam and pile combined support,and points out that the parameters of this design scheme have an optimizable space.(3)The paper Uses ABAQUS finite element software to perform a numerical simulation of K27 bedding slope under the anti-slide structure of anchor framework beam and pile,demonstrating the effectiveness of the treatment measures is demonstrated.Through univariate analysis,it obtains the law of changing parameters like anchor,frame beam and anti-slide pile on slope stability,and then preliminarily offers the optimal design range of these parameters.(4)Latin hypercube algorithm is used for sampling within the optimal design range of parameters.Based on the idea of approximate model,this paper fits the nonlinear mapping relationship between design parameters and safety coefficient and reinforcement scheme cost,and through testing concludes that the fitting degree of new Kriging model satisfies the design requirement and can estimate the safety coefficient and engineering cost of non-sampling sites in a relatively accurate way.(5)Based on Kriging model,the genetic algorithm is used to quickly search for the optimal cost design parameters meeting security requirements within the design range of corresponding parameters.By comparing with the finite element model of corresponding parameters,it is found that the optimization results can meet security requirements and effectively reduce engineering design cost.It has certain application significance in the complex geotechnical engineering problem with no obvious mathematical expression between the variable and the objective function.