施工进度是地下洞室群施工管理的关键。采用系统仿真方法对地下洞室群施工进度进行模拟时,参数繁多复杂,任何参数取值的微小变化都可能使进度发生改变,即进度波动的影响因素较多。以往的研究一般仅对为数不多的几个主要影响因素进行了敏感性分析,而地下洞室群施工进度仿真模型中存在多个扰动施工进度的因素,传统研究无法满足多因素分析的要求。因此,本文基于均匀试验设计,提出了地下洞室群施工进度仿真多因素敏感性分析方法,分析了各仿真参数对施工进度的影响程度,比较并筛选出对施工进度影响较大的敏感性因素。该方法应用于某水电站地下洞室群施工进度仿真模型中,结果表明:基于均匀设计的多因素敏感性分析,可以高效处理仿真参数较多的地下洞室群施工进度仿真模型的多因素敏感性分析问题,可以准确识别对施工进度影响显著的因素,为仿真与实际施工中参数取值的合理与优化提供科学依据。
Construction speed is a key issue to underground powerhouse construction management. In prediction of underground powerhouse construction speed using system simulation, there are many parameters whose small variation in value may lead to a great change in construction speed. Previous studies have been limited to sensitivity analysis only on a few main factors. An underground powerhouse construction simulation model, however, usually incorporates so many construction-disturbing factors that the traditional approach is unable to meet the requirements of multi-factor analysis. This article presents a multi-factor sensitivity analysis of underground powerhouse construction simulation using the uniform design method. We have analyzed the effects of various simulation parameters on construction speed and screened the susceptibility factors. This method was adopted in a simulation model of underground powerhouse construction speed for hydroelectric power stations, and the results show that the method is able to handle the multi-factor sensitivity analysis efficiently and accurately identify those susceptibility factors that have significant effect on construction. Thus, our method would lay a theoretical basis for evaluation and optimization of the simulation model parameters and construction speed of relevant practical projects.