Rock mass classification plays a key role in the tunnel design and excavation. Being limited to an enclosed area, the tradition rock classification method is difficult to adapt to double-shield TBM excavation. Based on the whole process of double-shield TBM excavation of tunnels in areas with complex geological conditions, this paper proposes a comprehensive classification method (DT) of surrounding rock suitable for double-shield TBM construction conditions. The results show that: (1) Content of schistose muck, penetration ratio and seismic wave velocity of rock mass are the three main characterization factors of surrounding rock quality during double-shield TBM constructing; (2) The three main factors have a good correlation on surrounding rock classification; (3) Compared with the traditional HC method, DT classification method can comprehensively reflect the quality of the surrounding rock mass within 3% error. (4) According to the three main factors can be obtain with the characteristics of convenient, real-time, objective and quantization during double-shield TBM constructing, the surrounding rock classification by DT method is more meticulous in the same tunnel section.
Zhang Shishu
,
Zhao Xiaoping
,
Zhong Guo
,
Ran Congyan
,
Hu Jinshan
. Study on Surrounding Rock Classification during Double Shield TBM Tunneling[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(5)
: 1662
-1669
.
DOI: 10.20174/j.JUSE.2025.05.21
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