| Along with the speeding up ofurbanization and continuous expansion of city in our country, the subway appears in many cities on a large scale. Because of it is convenient, comfortable and safe, it becomes the main means of transportation. The construction of the subway is a complicated process which is along with large scale, long construction period, strong concealment, many participant bodies. Every construction link exists great potential safety hazard. Compared with abroad, the development historyof subway in our country is relatively short, and the corresponding construction experience and technologyare short, so it is crucialto make a risk assessment and control in the process of urban subway construction,whichin some extentplays an important role in preventing the waste of money, personal injury and bad social influence as such events from happening.This paper first carries on the detailed analysis for the research status of subway construction risk at home and abroad as well as the studies ona series of contents related to the metro construction risk management such as risk identification, assessment, response and so on. And thenaccording to the fuzzy matter-element calculation method the paper selects, the papersummarizes its relevant concept, data processing principle and calculation steps. At the same time, the paper specifically selects the key evaluation index and establishes the corresponding construction risk assessment system according to the characteristics of subway construction and the actual construction situation.Finally the paper takes Zhengzhou Metro Line 2 project phase two interval shield tunnel construction project as the research background,according to which the construction risk assessment model is established based on the fuzzy matter-element comprehensive evaluation and the case study is carried out.In the traditional calculation method the expert scoring method to determine the weight is used much, but this method has strong subjectivity because of different cognitive degrees of selecting experts. Therefore, this paper makes use of AHP- entropy method which relatively has strong objectivity. This paper uses AHP-entropy to calculate the index weight of each layer of risk evaluation system. The Euclidean similarity measure is calculatedwith the reference to the Zhengzhou Metro Line 2 interval shield construction data.And then the standard of Euclidean approach degree demarcation point value is determined by the reference to the actual construction situation of risk evaluation model. Based on such calculation method, the study on the thesis project is developed. Aiming at the big difficulty of construction interval shieldof Zhengzhou Metro Line 2 and high safety risk construction section, this paper gathersconstruction data, computes the Euclideansimilarity measure compared with the standard sample of Euclidean similarity measure boundary, decides the risk level of construction, obtains the key construction risk needed to control and determines the overall risklevel of the project. Besides,aiming at the construction sector existing significant risks, the disaster prevention and control measures are used for the construction risk response.This paper considers the subway shield construction risk factorscomprehensively,which isbased on the calculating concept of Euclidean similarity measure and makes use of the fuzzy matter-element evaluation model to analyze and evaluate the risk.. The Euclidean similarity measure value in this model is obtained finally on the basis of calculating a large amount of relevant constructiondata. Therefore,the result of risk assessment on such basis is reliable with simplify operation, which has reference and significance to the later construction risk assessment of similar engineering. |
PDF Full Text Request