Study on Classification Index and Determination Method
of&nbsp;&nbsp;Extrahard
Rock for TBM Tunnel

WANG Yujie; CAO Ruilang; WANG Shengle; LIU Zhiming

doi:10.3973/j.issn.2096-4498.2020.S2.005

Tunnel Construction >

2020 , Vol. 40 >Issue S2: 38 - 44

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.S2.005

Study on Classification Index and Determination Method of Extrahard Rock for TBM Tunnel

WANG Yujie ,
CAO Ruilang ,
WANG Shengle ,
LIU Zhiming

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(1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 2. Xi′an University of Technology, Xi′an 710048, Shaanxi, China; 3. General Institute of Water Resources and Hydropower Planning and Design, Ministry of Water Resources, Beijing 100120, China)

Online published: 2021-03-21

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Abstract

It is an important issue to determine extrahard rock classification index in surrounding rock classification of TBM tunnel. The rock hardness and friction characteristic are the main factors affecting the TBM state in the tunnel construction through intact rock mass. Based on the TBM prediction models and the measured data of typical engineering cases, the relationship and sensitivity between the uniaxial compressive strength of rock and the penetration rate and field penetration index are analyzed emphatically. The friction characteristic of rock and the attrition of TBM cutters are analyzed. The thresholds suitable for classifying extrahard rock are discussed. The impact of rock hardness and friction characteristic on the TBM construction is analyzed synthetically, and two types of extrahard rocks are proposed as follows. (1) Extrahard rockd etermined by hardness (H1) , whose UCS is higher than 200 MPa. 〖ＪＰ２〗(2) Extrahard rock determined by hardness and friction characteristic (H2), whose UCS is higher than 150 MPa and CAI is higher than 4.0.

Key words： tunnel; TBM; extrahard rock; rock classification; penetration rate; field penetration index; rock hardness; friction characteristic

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WANG Yujie , CAO Ruilang , WANG Shengle , LIU Zhiming .

Study on Classification Index and Determination Method of Extrahard Rock for TBM Tunnel

[J]. Tunnel Construction, 2020 , 40(S2) : 38 -44 . DOI: 10.3973/j.issn.2096-4498.2020.S2.005

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