深基坑施工环境影响的模糊风险分析

FUZZY RISK ANALYSIS FOR INFLUENCE OF DEEP FOUNDATION PIT EXCAVATION ON SURROUNDING ENVIRONMENT

基于模糊数学的相关理论建立深基坑施工对周边环境影响的模糊风险评估模型,对工程实例加以解析化和定量化分析,提出合理的风险损失评价指标、风险等级划分以及风险损失计算公式。在求出基坑周围建筑物破坏、路面破损以及地下管线破坏的评价指标及其相对权重的基础上,针对各评价因子构造相应的隶属度函数,由各因素所占权重和评价因子的隶属度实现基坑工程对周边环境影响的风险分析与评估,通过风险综合评价值确定风险等级。针对具体工程确定的风险等级可作为工程决策的参考。

Based on fuzzy mathematics theory, a risk analysis model was established for the influence of deep excavation construction on surrounding environment. By using this model, reasonable risk loss evaluation index, risk grade division and risk loss formula were proposed through analytical and quantitative analysis of a concrete project example. After studying the evaluation index and relative weight of building damage, pavement damage and underground pipeline damage around the deep excavation, risk analysis and assessment of the influence on surrounding environment caused by excavation of foundation pit were achieved. The analysis and assessment is conducted through the membership degree which is given from the membership function structured for each evaluation factor. Then through the comprehensive risk evaluation, risk level can be finally determined. This result based on project example can be used as a reference for engineering decision-making.