基于可拓方法的基坑工程安全状况评价

Safety Status Assessment of Foundation Pit Engineering Based on Extension Theory

为系统评价基坑工程的安全状况,减少安全事故的发生,保障城市轨道交通工程的安全建设,基于基坑病变机理和大量工程实例构建了一套包括3级指标、10个因素的评价指标体系,并确定各个指标的等级量值区间,结合最小二乘法和熵权法,提出基于融合权重的指标权重确定方法,并基于可拓学理论综合评价基坑工程的健康等级。以武汉轨道交通二号线4个站点的深基坑工程为案例,评价其健康状况,根据蒙特卡洛模拟的基本理论,运用水晶球对工程实例进行敏感性分析,找出具体的敏感因素,结果验证了上述方法的工程实用性,为轨道交通站点的基坑安全管理提供简单有效的控制方法。

In order to quantitatively and systematically evaluate the safety status of the foundation pits and reduce the occurrence of safety accident,as well as ensure the safety of urban rail transit projects,a system of evaluation factors including 3 second level indexes and 10 third level indexes was built,on the basis of kinds of literatures and serious troubles mechanism. Then,the grades of all the indexes were classified. Besides,a comprehensive weight determination method combined with least squares method and entropy method were used to determine the weights of the indexes and based on the extension theory,the safety level of the foundation pits was comprehensively evaluated. At last,the four foundation pits belonging to Wuhan Metro Line 2 were set as the case to evaluate the safety condition and Monte Carlo theory and the software of Crystal Ball were used to identify the specific sensitivities on the basis of a great quality of randomized trails. The results can verify the practicality of the above methods and provide a simple and effective controlling method for management of foundation pits.