Modified Q-index for prediction of rock mass quality around a tunnel excavated with a tunnel boring machine (TBM)

被引:18
作者
Ji, Feng [1 ]
Shi, Yuchuan [1 ]
Li, Renjie [1 ]
Zhou, Chunhong [1 ,2 ]
Zhang, Ning [1 ]
Gao, Jishun [1 ]
机构
[1] Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Sichuan, Peoples R China
[2] China Hydropower Consulting Grp Co, East China Invest & Design Inst, Fuzhou, Fujian, Peoples R China
基金
中国国家自然科学基金;
关键词
Rock mass classification; Rock mass integrity; Reduction factor; TBM tunnel; Q-system; ENGINEERING CLASSIFICATION; EVOLUTION; SYSTEM; ZONE;
D O I
10.1007/s10064-018-1257-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Rock mass quality is closely related to tunnel stability and supporting measures. The Q-system, based on the drilling and blasting method, is one of the most important methods for rock mass classification systems and provides reliable long-term protection for tunnel excavation and reinforcement. However, in comparison to the drilling and blasting method, tunnels excavated using the tunnel boring machine (TBM) method have smooth and integral walls. The number of structural planes in these tunnels, their extension lengths, opening widths, and other characteristics are significantly different from those excavated using the drilling and blasting method. These differences lead to prediction errors in rock mass quality when the Q-system is applied to tunnels excavated by a TBM, and the coincidence rate is less than 70%. In this study, a reduction factor R-Kv, based on the wave velocity test, is used to replace the RQD/Jn term in the Q-system to reflect the integrity of the rock mass. This replacement can overcome the shortcomings that result from the smooth walls in TBM tunnels by applying the wave velocity during tunnel construction. Based on multiple regression analysis of R-Kv, we established a Q(T) method for rock classification of material surrounding TBM tunnels. This new method provides a prediction coincidence rate of more than 85%.
引用
收藏
页码:3755 / 3766
页数:12
相关论文
共 39 条
[1]  
Alber M, 1996, EUROCK '96/TORINO/ITALY - PREDICTION AND PERFORMANCE IN ROCK MECHANICS AND ROCK ENGINEERING, PROCEEDINGS, VOLS 1 AND 2, P721
[2]   Advance rates of hard rock TBMs and their effects on project economics [J].
Alber, M .
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY, 2000, 15 (01) :55-64
[3]  
[Anonymous], 2008, Tunnels & Tunnelling International, P26
[4]  
[Anonymous], 2010, Min. Sci. Technol, DOI DOI 10.1016/S1674-5264(09)60221-0
[5]   Fuzzy set approaches to classification of rock masses [J].
Aydin, A .
ENGINEERING GEOLOGY, 2004, 74 (3-4) :227-245
[6]   Some new Q-value correlations to assist in site characterisation and tunnel design [J].
Barton, N .
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, 2002, 39 (02) :185-216
[7]  
Barton N., 1974, ROCK MECH, V6, P189, DOI DOI 10.1007/BF01239496
[8]  
BARTON N, 2000, TBM TUNNELLING JOINT, P173
[9]  
Barton N., 1999, Tunnels Tunnell. Int, V31, P41
[10]  
Bieniawski Z.T., 2006, ITA AITES WORLD TUNN