盾构刀盘系统掘进性能评价方法研究

Method for Evaluating the Driving Performance of a Cutterhead System of a Shield Machine

研究刀盘系统掘进性能评价方法有助于刀盘设计方案的优选,对于提高盾构掘进效率,降低施工成本和提高施工安全性具有重要意义。文章将仿真分析与模糊评价方法相结合,提出一种根据刀盘掘进性能优劣来确定最优刀盘设计方案的模糊综合评价方法。文章首先提出了刀盘的掘进性能指标,建立了刀盘系统掘进的离散元仿真模型和掘进性能指标的获取方法;其次以五个刀盘掘进性能指标为评价因素,根据专家评分法确定因素的重要程度,以仿真和分析数据确定评价因素的等级指标和评价矩阵,并采用广义模糊合成算法对刀盘掘进性能进行模糊综合评价;最后以北京地铁砂卵石地层盾构隧道施工为例,采用模糊综合评价法得出辐条式盾构刀盘掘进性能优于辐板式盾构刀盘的结论。

Research on the method for evaluating the driving performance of cutterhead systems is helpful to obtain optimal cutterhead design, which is significant for improving the efficiency of shield tunneling, reducing construc- tion costs and improving construction safety. Combining simulation analysis with the fuzzy evaluation method, a fuzzy comprehensive evaluation method is proposed based on the driving performance of the cutterhead to deter- mine optimal cutterhead design. The performance index of the cutterhead driving system is presented. A discrete-el- ement simulation model of the cutterhead system and the method to obtain the driving performance index are estab- lished. Five driving performance indexes of cutterhead systems are selected as the evaluation factors and the impor- tance degrees of the five factors are determined by the Delphi method. The grade index and the evaluation matrix of the evaluation factors are determined by simulation and data analysis. The driving performance of the cutterhead is evaluated by the generalized fuzzy synthesis algorithm. Using the shield construction of the Beijing Metro in a sandy pebble stratum as an example, it is proved by the fuzzy comprehensive evaluation method that the driving perfor- mance of a spoke-type cutterhead is better than the board-type cutterhead.