Assessment of TBM Tunneling Status using Fuzzy Comprehensive Evaluation Method
- Y. Xue (Key Laboratory of Geotechnical and Underground Engineering (Tongji University) / Tongji University) | H. Dong (Key Laboratory of Geotechnical and Underground Engineering (Tongji University) / Tongji University) | X. Li (Key Laboratory of Geotechnical and Underground Engineering (Tongji University) / Tongji University) | F. Zhao (China Station Construction Silkroad Construction Investment Group CO., LTD.)
- Document ID
- International Society for Rock Mechanics and Rock Engineering
- ISRM International Symposium - EUROCK 2020, 14-19 June, physical event not held
- Publication Date
- Document Type
- Conference Paper
- 2020. International Society for Rock Mechanics and Rock Engineering
- TBM performance, Tunnel boring machine, Tunnel boring machine, TBM performance, fuzzy comprehensive evaluation, tunnelling status, tunnelling status, fuzzy comprehensive evaluation
- 3 in the last 30 days
- 3 since 2007
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Tunnel boring machines (TBM) are widely used in the excavation of tunnels built in hard rock, and the proper operational parameters plays an important role in obtaining high tunnelling efficiency. However, the selection of operational parameters depends on the drivers' subjective perception of tunnelling status, which may lead to misjudgement and untimely adjustment. A comprehensive assessment of TBM tunnelling status need to be introduced.
In this paper, fuzzy comprehensive evaluation method is adopted to assess the tunnelling status while tunnelling. Taking the penetration rate, advance rate, utilization, tunnelling energy and disc cutter wearing into account, an evaluating set was established, and each factor was weighted and their membership function was established. Thus a complete procedure of tunnelling status was formed. Based on the statistical of tunnelling data collected from Yinhanjiwei project in China, this established method was verified.
The evaluating results from field data shows the reasonability and feasibility of the established evaluating method. The tunnelling status of TBM are classified into four classes, and in certain class of rock mass (BQ classification), the tunnelling status of TBM varies from good to bad, which means operational parameters may not be set properly, to obtain better TBM performance, operational parameters should be adjusted according to geological conditions.
This method established considers factors in aspects of tunnelling efficiency and economic, so that it can be a good way to assess the comprehensive tunnelling status of TBM, furthermore it could be a good reference for TBM drivers to decide whether some adjustment should be made. What's more, this method can also be used in the TBM design phase to predict tunnelling status, for proper planning of project.1 Introduction
Last decades have seen a great increase in the exploitation and utilization of underground space. Tunnels crossing rock or soil are under construction all around the world to meet huge demand of transportation and resources supplement. TBM (Tunnel Boring Machine), a highly mechanized method that specialized in hard rock tunnelling, is more and more selected rather than traditional DBM (Drilling and Blasting). Despite the advantages of high advance rate and safety, several problems still exist in the TBM construction. For example, TBM has poor performance in terms of stratum adaptability, which means that some unfavourable geological conditions may result in the low-efficiency or even breakdown of TBM. In this context, on one hand, TBM manufacture should guarantee adequate capacity to excavate the stratum along the tunnelling line, and on the other hand, the operational parameters should be selected properly according to geological conditions and tunnelling state. Selection of TBM operational parameters would make a great difference to advance rate, tunnelling efficiency and disc cutter (installed in the front of TBM to break rock) wearing. However, the selection of operational parameters depends mostly on experiences of TBM driving crews. As far as we know, there are barely some methods established for the crews to evaluate the TBM tunnelling status, so, establishing a comprehensive evaluation method is quite necessary.
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