基于层次分析法的TBM滚刀评价方式

TBM Roller Cutter Evaluation Method Based on Analytic Hierarchy Process

[目的]为了减少TBM(硬岩隧道掘进机)在高磨蚀性岩层中掘进时的换刀次数,以及选出最适用于高磨蚀性岩层的滚刀,提出一种基于层次分析法的滚刀评价方法。[方法]建立了滚刀磨损失效危害评价模型;选取7个磨损失效类型因素,基于层次分析法建立了滚刀磨损失效危害评价模型和比较判断矩阵,计算出各失效类型危害的占比;以广佛东环城际铁路大源站至太和站区间线路为例,对4个常用品牌的滚刀进行定量分析;建立风险评价分值表,分析4个品牌的滚刀在使用过程中的失效影响评价值。[结果及结论]高磨蚀岩层中的滚刀非正常磨损占比为23.29%,正常磨损占比为76.71%。c品牌和d品牌滚刀的失效影响评价值分别为7.141和4.816,远小于a品牌滚刀的失效影响评价值7.587和b品牌滚刀的失效影响评价值9.058。d品牌滚刀的相对磨损速率大于c品牌滚刀,因此c品牌滚刀最适用于高磨蚀性岩层。a品牌滚刀适用于硬度极大的岩层,b品牌滚刀不推荐使用,d品牌滚刀适用于硬度较小的岩层。

[Objective]In order to reduce the number of cutter replacements during TBM(hard rock tunnel boring machine)excavation in highly abrasive rock strata and select the most suitable roller cutter for highly abrasive rock strata,a roller cutter evaluation method based on AHP(analytic hierarchy process)is proposed.[Method]An evaluation model for roller cutter wear failure and hazards is established.Seven factors related to wear failure are selected,and an evaluation model and comparative judgment matrix for roller cutter wear failure are developed based on AHP.The proportions of hazard for each failure type are calculated.Taking the interval between Dayuan Station-Taihe Station on Guangzhou-Foshan East Ring Intercity Railway as an example,a quantitative analysis is conducted on four commonly used brands of roller cutters.A risk assessment scoring table is established to analyze the failure impact evaluation values in the use of four roller cutter brands.[Result&Conclusion]The proportion of abnormal cutter wear in highly abrasive rock strata accounts for 23.29%,while normal wear accounts for 76.71%.The failure impact evaluation values for brand C and brand D roller cutters are 7.141 and 4.816 respectively,which are much lower than the failure impact evaluation value of brand A(7.587)and brand B(9.058)roller cutters.The relative wear rate of brand D roller cutters is higher than that of brand C cutters,indicating that brand C cutters are most suitable for highly abrasive rock strata.Brand A roller cutters are suitable for high hardness level rock strata,brand B cutters are not recommended for use,and brand D cutters are suitable for lower hardness level rock strata.