基于正交试验的水利工程基坑设计方案参数优选

Parameter Optimization of Hydraulic Engineering Foundation Pit Design Scheme Based on Orthogonal Test

水利工程基坑设计专业性强、风险大,对设计人员执业经验依赖性高。为降低对设计人员的经验依赖,提高基坑设计的效率,以基坑支护的结构安全可靠和经济合理为目标,快速合理地确定基坑设计参数,可引入正交试验表安排试验方案,通过对试验结果的统计分析和多重比较迅速搜寻最优方案。以深厚软土地区水泥土搅拌桩重力式挡土墙基坑支护为例,在选择挡墙宽度、嵌固深度、被动区加固土体深度及宽度等参数作为可变因素进行正交试验的基础上,对试验结果进行方差分析以确定相关设计目标的主要影响因素,并通过多重比较迅速完成基坑设计方案参数优选,给出基于正交试验的基坑设计流程图,可为类似基坑设计提供有益的参考。

The design of hydraulic engineering foundation pit is highly professional and risky,and has high dependence on the experience of designers.Thus,to reduce the experience dependence of the designers,improve the efficiency of the foundation pit design and determine the design parameters of the foundation pit quickly and reasonably,the orthogonal test table is introduced to arrange the test scheme aiming the reliability and economy of the structure of foundation pit support.Through statistical analysis and multiple comparison of the experimental results of orthogonal test,the optimal scheme can be quickly fixed.This research takes the foundation pit support of gravity retaining wall of cement-soil pile in deep soft soil area as an example.It selects the width of the retaining wall,the embedded depth,the depth and width of the soil reinforcement in the passive area as the variable factors of orthogonal test.Then the variance analysis of the test results is carried out and the main influence of the related design targets is determined.Through multiple comparison,the optimization of the design parameters of the foundation pit design is completed rapidly.Finally,the design flow chart of the foundation pit based on the orthogonal test is given,which can provide a useful reference for the design of similar foundation pit.