砂卵石地层地铁盾构盘形滚刀磨蚀性研究

刀具磨损一直是影响盾构法施工质量及进度的关键问题，其在砂卵石地层中表现得尤为明显。为了研究砂卵石地层地铁盾构滚刀磨蚀性的规律，本文依托成都地铁1、7号线，首先分析了掘进机掘进参数和砂卵石地层不均一性对滚刀磨损的影响，总结了影响滚刀磨损量的各种因素|然后模拟现场情况制备室内岩箱模型，借助滚刀岩机作用实验台进行了不同刀具布置位置的磨损试验，通过3D扫描仪测得滚刀的磨损量，根据磨损量预测模型计算磨损系数，得到了砂卵石地层刀具的磨蚀规律|最后跟现场实测结果进行对比分析，试验结果与实测结果相吻合，通过室内试验测得的磨损系数，将其应用到现场实测中，推测出最长掘进距离，能够做到较为准确预测刀具磨损严重时盾构机掘进的距离，不需开舱检查即可判断滚刀磨损轻重，节约了施工时间。研究成果可为砂卵石地层盾构掘进提供一定的借鉴和指导作用。

Study on abrasive properties of shielded hob in subway shield of sandy gravel formation

Tool wear has always been a key issue affecting the construction quality and progress of shield construction, which is particularly evident in sandy gravel formation. In order to study the abrasive law of shield tunnel hob in sandy gravel formation, This article relies on Line 1 and 7 of Chengdu Metro, Firstly, the influence of tunneling parameters and the unevenness of sandy gravel formation on hob wear were analyzed, the various factors that affect the amount of hob wear were summarized| And then simulate the scene situation to prepare the interior rock box model, the wear test of different tool layout was carried out by means of the hobbing machine, the amount of wear of the hob is measured by a 3D scanner, the wear coefficient is calculated from the wear model, the abrasive law of tool in the sandy gravel formation  is obtained| Finally, the results are compared with the field results, they roughly agree with each other. The coefficient of wear was measured by laboratory tests, and applied to the field measurement, the longest excavation distance is deduced, it can be more accurate prediction tool wear serious when the shield machine driving distance without the opening check, the wearing degree of the hob can be judged, and the construction time is saved. It provides some reference and guidance for shield tunneling in sandy gravel formation.