Study Of Risk Analysis In Bored Pile Retaining Structure And SMW Pile

There is very big enhancement in our country of foundation pit engineering design and construction on the last two decades, but in the process of development, there is a lot of problems. On the one hand, is the high rate of engineering accident in the field of foundation pit engineering, there are about a third of the areas in the early development had different degree of accident, even in mature stage often have different levels of accident; On the other hand, due to the unreasonable retaining design, often result in higher costs of the projiect. Therefore, this article mainly aims at two kinds of commonly used foundation pit supporting scheme--bored piles and SMW pile, the issue takes consider of engineering cost based on the risk analysis research of foundation pit engineering,to provide the theoretical basis for better decision-making.In this paper, the research content mainly includes:1. In this paper, the main train of research on risk analysis of foundation pit engineering is accident tree-analytic hierarchy process, based on the principle of fault tree establishment and study of the accident cause of foundation pit engineering,from each sub-division engineering which composite the support system-the pile,internal support system,purlin system,ring beam and the start point, to consider the risk source of basic events related to the specific project,build fault tree and rick list for two support schemes.2. According to the principle of analytic hierarchy process combined with the risk list,construct the risk factor hierarchy model of bored pile and SMW pile support respectively,expert investigation method was used to construct judgment matrix, and use the power method to calculate bored piles risk factor weight, use MATLAB language programming to calculate weight of SMW retaining structure risk factors.Using MATLAB language combination of judgment matrix calculation,can make the calculate of judgment matrix from complicate to simple, and the accuracy is guaranteed.The21st century is the age of digital,combine risk analysis with the digital world can better promote the development of foundation pit engineering risk management system.3. Based on the research of deep excavation engineering risk analysis results, to analysis the risk of two designed supporting structurethe of the same engineering,23and connecting with the economic analysis, provide powerful basis for decision making optimization.