中文摘要：

提出基于变权可拓的安全风险评价方法.首先构建物元可拓模型;其次利用变权思想确定评价指标权重,再计算待评物元与经典域各等级的贴近度,并根据贴近度确定风险等级特征值;然后利用变权理论对指标进行敏感性分析,判别敏感性指标并加强监控控制.结合工程实例,对基坑施工中钻孔灌注桩监控单元的安全风险进行评价并指出敏感性指标,结果表明该评价方法具有较好的工程应用价值.

英文摘要：

In this study a risk assessment approach based on variable weights and matter-element extension is put forward. Firstly, the matter-element extension model is built. Secondly, the degree of closeness of the matter element is calculated and then the risk level is determined according to the degree of closeness. Furthermore, sensitivity analysis has been made through the variable weights. Finally, with engineering example, the risk of the bored piles in foundation pit construction is analyzed and the sensitivity of indica- tors is pointed out. The results show that the evaluation method can be more widely used in engineering than other evaluation methods.