Research Of Optimal Selection Of Pile Foundation Schemes Application Based On AHP Value Engineering

With the economic development rapiddy, Civil Engineering industry has entered a golden period of development, High-rise buildings are appear Each place of country. According to statistics, Pile foundation was the most commonly used on the basis of high-rise buildings, The advantages of pile foundation is alarge pile capacity, small deformation, the settlement is small. However, There are variety of pile foundation，and has various of construction methods. If choose a different pile foundation programs,It will bring about the huge different of economic and social, So, it is very important to find a reasonable way tomake the choose of pile foundation scheme.This paper based on the analytic hierarchy process (AHP) of the value engineering theory in selection of pile foundation scheme，The detailed research as follows：(1) Adjusting the work procedures of value engineering, To make it moresuitable for the pile foundation scheme optimization. Analyzing the process ofpile foundation scheme optimization. And summarizes the value engineering characteristics of pile foundation scheme optimization. According to the theory ofvalue engineering, Put forward the process of pile foundation scheme optimization.(2) Applying the AHP of value engineering theory in project example, First, according to the engineering situation and primary optimization of pile foundation scheme Principle.,put forward the pile foundation scheme.Second, to make function analysiso of pile foundation scheme optimization activity, including the function definition, classification and sorting.Building the pile foundation scheme optimization activity of type function system diagram (FAST figure),Remove unnecessary and auxiliary functions, to simplify the task type FAST figure. The simplify of task type FAST figure have hierarchy clear, strong logicality, suitable for multilevel hierarchical structure model of analytic hierarchy process(3) Using the AHP to Function evaluation for optimization of pile foundation scheme activities, construction of judgment matrix, the matlab software andits function weight, The weight function calculation with MATLAB software.The owner、design、survey、 supervision、 construction unit consisting of a grade group，give the scores for alternatives, get the function coefficient. To alternatives for scientific and reasonable cost forecast, get the cost coefficient.Last,according to the principle of value engineering to calculate the value coefficient, and based on the principles of high value coefficient is the optimal schemeof pile foundation for optimizing alternatives.The best scheme of construction organization, the low strain test and static load test of the pile foundation of the conform to the requirements. The actual construction period shortened3days than the plan, actual cost than estimated costs saved about140000yuan, proved that the AHP of value engineering theory to the effectiveness of the pile foundation scheme optimization. And it’salso for pile foundation scheme optimization to provides a feasible method.