ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2017, Vol. 37 ›› Issue (7): 788-793.DOI: 10.3973/j.issn.1672-741X.2017.07.002
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YANG Jihua, QI Sanhong, GUO Weixin, ZHANG Dangli
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Abstract:
The rock quality designation (RQD), joint space and joint characters of diversion tunnel of CCS Hydropower Station in Ecuador bored by doubleshield TBM are obtained by rock mass rating (RMR), uniaxial compressive strength calculated by rebound test, observation of tunnel wall and working face through shield gaps and cutterhead gaps and rock slag and tunneling parameters. Seven indexes, i. e. rock rebounding value, surrounding rock integrity, RQD, cutterhead thrusting force, cutterhead torque, content of sheet rock slag, and seepage volume of groundwater, are selected and assigned by comprehensive analysis. The surrounding rock classification standards are established; and the classification of surrounding rocks is carried out by summation method. The classification results show that the selected seven indexes can overcome the difficulties of comprehensive geological sketching when using doubleshield TBM, meet the rapid construction requirements and reflect the surrounding rock accurately. In other words, the classification results are reliable.
Key words: CCS Hydropower Station in Ecuador, diversion tunnel, doubleshield TBM, surrounding rock classification
CLC Number:
U 451+.2
YANG Jihua, QI Sanhong, GUO Weixin, ZHANG Dangli. Study of Surrounding Rock Classification of Diversion Tunnel of CCS Hydropower Station in Ecuador Bored by Doubleshield TBM[J]. Tunnel Construction, 2017, 37(7): 788-793.
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URL: http://www.suidaojs.com/EN/ 10.3973/j.issn.1672-741X.2017.07.002
http://www.suidaojs.com/EN/Y2017/V37/I7/788