Study On Optimization Of Construction Plan For Full Casing Cast-in-place Pile Projects

Full casing cast-in-place piles can bear large loads in the supporting system and have little disturbance to the surrounding soil.In recent years,full casing cast-in-place piles have been widely used in construction.The formulation of construction plan for Full casing cast-in-place piles is a very important task,but the existing construction plan formulation methods based on construction experience are subjective and non-replicable,and the problem is easy to be one-sided.Therefore,it is necessary to establish an efficient,comprehensive,reasonable,objective and economic principle of pile foundation selection,and optimize the selection to make the construction plan more economical,reasonable,safe and efficient.In this thesis,the optimization of full casing cast-in-place pile plan is taken as the research object.Based on the analysis of the concept,construction technology and principle of full casing cast-in-place,the construction plan of full casing cast-in-place piles under different influencing factors is put forward.Based on practical experience and referring to experts' opinions in related fields,the relationship between various factors in the construction of full casing cast-in-place piles is obtained,and the correlation matrix of influencing factors is constructed.Based on the correlation matrix,an interpretative structural model for optimizing the plan of full casing cast-in-place piles is established,and the relationships among the influencing factors are straightened out.The analytic hierarchy process(AHP)is applied to establish the AHP model to solve the defects in consistency test of the improved hierarchical sorting and exponential scale.The evaluation index system for optimization of c o n s t r u c t i o n p l a n f o r f u l l c a s i n g c a s t-i n-p l a c e p i l e p r o j e c t s are constructed,and the judgment matrix is established.By comparing the weight of each plan relative to the evaluation index,the optimal construction plan for full casing cast-in-place piles is selected.Taking the construction project of full casing cast-in-place piles across Shanghai metro line 9 as an example for application verification,the important role of AHP in the optimization process of cast-in-place pile construction plan is analyzed.In this thesis,the traditional AHP has been improved to make it more practical and reasonable.According to the requirements of optimum selection of pile foundation plan,the example shows that the method has certain applicability.