Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (7): 1877-1883.doi: 10.16285/j.rsm.2021.1655

• Geotechnical Engineering • Previous Articles     Next Articles

Real-time estimation of surrounding rock strength in composite strata tunnels

ZHANG Hai-long1, 2, TANG Yang1, RENG Ting3, ZHANG Dong-ming4, WANG Jun-jie5, GE Su-gang6, OKUBO Seisuke1   

  1. 1. School of Civil Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400044, China; 3. School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404020, China; 4. School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China; 5. School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 6.China Railway 23rd Bureau Group 6th Engineering Co., Ltd., Chongqing 401121, China
  • Received:2021-09-16 Revised:2021-12-16 Online:2022-07-26 Published:2022-08-04
  • Supported by:
    This work was supported by the Natural Science Foundation of Chongqing (cstc2019jcyj-msxmX0488, cstc2021jcyj-msxmX0354), the Science and Technology Research Project of Chongqing Municipal Education Commission (KJQN201901338), the China Postdoctoral Science Foundation (2021M693751) and the Major Incubation Project of Chongqing University of Arts and Sciences (P2017JG18).

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Abstract: In TBM excavation, the composite rock strata are often encountered, in such a case, it is not easy to estimate surrounding rock strength during tunneling where the tunnel face and wall tend to collapse. For improvement of tunneling efficiency and disaster prevention, it is necessary to estimate surrounding rock strength in real time. Based on laboratory tests and field data in the construction of Chongqing Railway Line 9, it was found that the thrust FN is proportional to rock strength, it was also found that the ratio of the torque force to thrust, T/FN were proportional to p0.5 (penetration p). In this study, for composite rock strata(including sandy mudstone, sandstone and limestone) surrounding tunnel, a method that can quickly estimate surrounding rock strength from thrust and torque measured in-site, was developed. The method can estimate rock strength in real time with two constants α1, α2 which can be obtained by linear fitting of the field data for TBM. The method had been already applied to more than ten tunnels. It was found that two constants were only related to the number of disc cutters n and cutter-head diameter d for this geological environment of composite rock strata. The results provide a more practical and feasible idea to estimate surrounding rock strength in real time, and also can improve the reliability and safety of tunnel TBM construction.

Key words: composite strata, TBM, surrounding rock, real-time estimation, reliability

CLC Number: 

  • TU 457
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