基于模糊理论的某深基坑建设安全及监测分析

Analysis on Safety and Monitoring of Deep Foundation Pit Construction based on Fuzzy Theory

该文将模糊数学中的模糊综合评价方法引入到深厚软土大型深基坑工程建设过程中进行安全评估,对基坑建设过程中多因素影响的结构物作出有效的安全综合信息评价。重点研究了相应的理论模型、应用评估方法,并对比现场监测试验。通过模糊理论建立数学模型,根据工程特点建立因素集合评价集,寻找相关因素集和评价集,形成隶属函数。在此基础上以实际工程为背景筛选出四大因子项:(1)岩土工程条件;(2)支护结构体系;(3)基坑环境;(4)附属结构。利用模糊综合评价法对基坑建设过程中的安全隐患进行评价,并得出量化评价结果等级。最后,结合基坑建设过程、现场监测实验结果、变形拟合回归曲线及变形预测函数等多信息,证明了模糊理论的正确性和可行性。

In this paper,the fuzzy comprehensive evaluation method in fuzzy mathematics is introduced into the construction process of large deep foundation pit in deep soft soil to carry out safety assessment.The effective safety comprehensive information evaluation for structures affected by multiple factors in the process of foundation pit construction is made.The corresponding theoretical model and application evaluation method are mainly studied and compared with the on-site monitoring test.Through the fuzzy theory,the mathematical model is established,according to the characteristics of the project,a factor evaluation set is established,looking for the relevant factor set and evaluation set,the membership function is formed.On this basis,four factors are screened out based on the actual engineering background:(1)Geotechnical conditions;(2)Supporting structure system;(3)Foundation pit environment;(4)Auxiliary structure.The fuzzy comprehensive evaluation is used to evaluate the potential safety hazard of foundation pit construction process,and the quantitative evaluation result grade is obtained.Finally,the correctness and feasibility of fuzzy theory are proved by the construction process,field monitoring experiment results,deformation fitting regression curve and deformation prediction function.