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- Title
Prediction model for disc cutter wear during hard rock breaking based on plastic removal abrasiveness mechanism.
- Authors
She, Lei; Zhang, She-rong; Wang, Chao; Wu, Zheng-qiao; Yu, Lun-chuang; Wang, Li-xin
- Abstract
In this study, the correlation between the uniform wear volume of the disc cutter and the normal load is established based on a principle of microcutting plastic removal of abrasive wear. By introducing a calibration expression of the normal load for CSM model, the wear rate index and life index of a disc cutter are defined and derived; thus, a theoretical prediction model for rock-breaking wear of disc cutters is developed, and the quantitative relationship between the cutter wear index and various influencing factors is obtained. In addition, an orthogonal experimental design method is used to propose the criterion for the significance level of the parameters of the models. The results show that in the selection of actual tunneling parameters and the optimization design of the cutterhead, the values of the rock compressive strength, the rock brittleness index, the penetration depth, and the material hardness and the spacing of neighboring disc cutter should be the focus of parameter research. Furthermore, the validity and reliability of the developed models are validated by two hard rock tunnel engineering cases. Finally, the prediction models are applied to the under-construction project of Metro Line 12 in Shenzhen, China, and the parameter optimization measures to reduce disc cutter wear and prolong cutting life are proposed. A scheme for the inspection and replacement of disc cutters is also formulated. All the input parameters of the proposed model are easily accessible at the early stage of project construction, and the accuracy of the predictor is more than 80%. Therefore, it is a very practical tool for designers and constructors.
- Publication
Bulletin of Engineering Geology & the Environment, 2022, Vol 81, Issue 10, p1
- ISSN
1435-9529
- Publication type
Article
- DOI
10.1007/s10064-022-02915-5