深基坑支护方案云模型综合评价方法

Comprehensive Evaluation Method for Deep Excavation Retaining Schemes Based on Cloud Model

在深基坑支护方案评价中,定性因素多,不确定性强,应用传统的数学方法评价难以保证其准确性及客观性。针对深基坑支护方案设计阶段评价指标不能定量表示的现实,提出了基于云模型的深基坑支护方案综合评价方法。该方法首先将专家给出的定性评价意见表示为5级自然语言标度,用黄金分割法将定性的自然语言评价信息转换为定量指标(云数字特征);然后根据虚拟云算法将不同专家的评价云集结组成综合云,各项评价指标的综合云集结组成最终评价的浮动云;最后通过计算浮动云的相对距离贴近度,按照云模型相对贴近度排序准则,得到方案排序结果。通过蔚蓝时代B3地块商务办公楼及地下车库深基坑4种支护方案实例,用可靠性、止水效果、经济性、施工难度和环境影响5项定性指标进行综合评价,验证了该方法的有效性。

In the evaluation of deep excavation retaining scheme,there are many qualitative factors and uncertainties,it is difficult to ensure its accuracy and objectivity by using traditional mathematical methods. In view of the fact that the evaluation indexes of deep excavation retaining scheme can not be quantitatively represented in the stage of scheme design,a comprehensive evaluation method for deep excavation retaining scheme with natural language was proposed based on cloud model. Firstly,the qualitative evaluation opinions given by experts were expressed as 5 levels of natural language scales,by using the golden section,the qualitative natural language evaluation information into quantitative index-digital characteristic of cloud model were transformed; Then,according to the virtual cloud algorithm,the evaluation clouds of different experts were aggregated to form an integrated cloud,and evaluation cloud of each index was aggregated to form a floating cloud for final evaluation. Finally,through the calculation of the relative distance close-degree of floating clouds and according to the ranking criterion of cloud mode-relative closeness,the results of scheme sorting were obtained. The validity of the method is verified by cases of 4 deep excavation-retaining schemes of Blue Age B3 Project Commercial Office Building and Underground Garage with the comprehensive evaluation of the reliability,water sealing effect,economy,construction difficulty and environmental impact.