邻近建筑物条件下青岛地铁盾构施工风险评价

Risk Assessment of Shield Construction of Qingdao Metro Adjacent to Buildings

以往构建的邻近建筑条件下地铁盾构施工风险指标没有考虑指标间的相关性,且忽略专家的犹豫程度,首先从方法创新的角度利用决策实验室法(DEMATEL)确定准则层间综合影响关系,作为控制层结构关系构建网络层次结构模型,求出DEMATEL和ANP相结合的主观混合权重;再以熵权法求解客观权重,采用主客观权重偏差平方和最小为目标函数求解组合权重;最后考虑了专家犹豫程度,运用vague集法进行施工风险评价。通过计算得出青岛地铁1号线安安区段风险等级与工程实际相符合,进而验证了该评价方法的实用性。

The correlation among the indices was not considered in the existing risk assessment of metro shield construction adjacent to buildings, and the experts′ hesitation degree was ignored as well. Hence, the decision-making and trial evaluation laboratory (DEMATEL) is used to determine the inter-layer comprehensive impact relationship of the criteria;and an analytic network process ( ANP) model is established to solve the subjective mixed weights of DEMATEL and ANP from the perspective of method innovation. And then the objective weights are calculated by the entropy weight method;the smallest sum of squared deviations of the subjective weights and the objective weights is taken as the objective function to solve the combination weight. Finally, the construction risk assessment is performed using the vague set method considering a certain degree of hesitation of the experts. The calculated risk level of the An′an Section on Qingdao Metro Line 1 is consistent with the actual project, which verifies the practicality of the above mentioned method.