Option Study Of Supporting System Of Foundation Pit

Foundation pit is a systematic engineering which characterized by complexity. The choice of its supporting system plays an important role in the whole engineering and has a direct influence on the process, construction cost and quality. With the worsening of land shortage in the urban area of our country, the utilization of underground space becomes more and more important, which brings forward higher demand for the excavation and support of foundation pit. Meanwhile, because the foundation pit is located in a certain place and has the characteristics of high constructing cost and serious result of collapsing accident, the construction of foundation pit should be highly secured with the design of supporting system of foundation pit being rational and cost being economical. In this case, the scheme of supporting system of foundation pit seems especially important.The paper, in the light of the features of supporting system of foundation pit, presents an evaluation target on the scheme optimization of it and expounds in detail the content of every target. It obtains the weighted value of each target by using Analytical Hierarchy Process and establishes the scheme optimization of supporting system of foundation pit on the basis of gray slope-correlation. In the scheme it provides the reference of preparatory scheme - the approach to determine the ideal scheme, that is, to take the optimization of the same target among the selected schemes as the expectancy of ideal target. Through the concrete construction, analysis is made on experts' grading and three preparatory schemes are evaluated on the basis of the first-level and second-level evaluation targets. Finally, the consequences resulted from the two evaluation targets are compared and tested to prove their rationality.