COMPREHENSIVE STUDY ON PREDICTION OF ROCKBURST IN DEEP AND OVER-LENGTH HIGHWAY TUNNEL

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1 24 6 Vol.24 No Chinese Journal of Rok Mehanis and Engineering Aug ( ) TU 457 A (2005) COMPREHENSIVE STUDY ON PREDICTION OF ROCKBURST IN DEEP AND OVER-LENGTH HIGHWAY TUNNEL LU Qing SUN Hong-yue SHANG Yue-quan CHEN Kan-fu 2 XU Guo-feng 2 (. College of Civil Engineering and Arhiteture Zhejiang University Hangzhou China 2. Zhejiang Provinial Planning Design and Researh Institute of Communiations Hangzhou China) Abstrat Cangling tunnel in Taizhou Jinyun highway with a depth about 768 m and with a length about 7.6 km will be the deepest and longest tunnel in Zhejiang Provine after onstrution. Rokburst is a serious problem during the tunnel exavation. For the predition of rokburst physio-mehanial properties of the rok masses were tested in the laboratory and the in-situ stress state in the engineering area was measured and analyzed. Then the rok masses along the tunnel were lassified on the basis of loal geologial investigation. A mehanial model was developed to express the atual onditions of the engineering area aording to properties of the rok masses foal mehanism solutions and in-situ stress state. The in-situ stress field of the engineering area was regressed by 3D finite element method (FEM) by using in-situ measured stress. The alulated results were applied to numerial analysis of the stress distribution in rok masses around the tunnel. Finally the probability and intensity of rokburst along tunnel were predited aording to four different rokburst predition models developed by predeessors on the basis of alulated stress distribution around the tunnel and uniaxial ompressive strength of the rok masses. Key words tunneling engineering rokburst in-situ stress numerial simulation (403728) (978 ) 200 lvqing@zju.edu.n

2 [ 8] 3. R 70%) Φ Φ Φ Kidybinski W = Φ () W 2 3 ( ET b ST ET SP /ΦST C SP 0 K K K K km 768 m Fig. Energy aumulation in rok speimen [2 9 ] W ET m m m W ET 2.0 ( ) NE NEE 2.0 W ET 5.0 ( ) (2) WET 5.0 ( )

3 (2) 4 2 MTS85Teststar 0. mm/min R b 70% WET 4 WET NEE NW EW NWW Tabe Uniaxial ompressive strengths of the two main speimens /MPa (996 5 ) 2 Fig.2 Foal mehanism solutions in north areas to the engineering site Vp km/s [2] G IV V MPa IV V II III [9] 4.2

4 () H ) h ) (2) 2 (3) NW30 72 NW 2 3 Table 2 Fitting results of horizontal prinipal stresses inreased with depth based on in-situ data Fig.3 Finite element bak analysis model of in-situ stress field based on measured results H h H /m H = H CS () h = H H = H CS h = H (2) H = 0.55 H CS h = H () H h (2) H (m) (3) km 8 km m K K H ) MPa y ) MPa 3 K K NW69 3 Table 3 Physio-mehanial properties of rok masses 6 39 /MPa /(kn m 3 ) x ) 50 m 40 m() [3 4] x y

5 () Russenes Russenes 974 Kirsh R / R 0.20 ( ) ( 4 ) 0.20 / R 0.30 ( ) 59.5 MPa ) 48.9 (3) 0.30 / R 0.55 ( ) MPa 0.55 / R ( ) (2) R / 4.5 R / = 4.5 R / = R / 2.5 ( ) ( ) ( ) ( ) (4) (a) x = 4. MPa y = 7. MPa (3) Rb / R R (b) x =5.0 MPa y = 6.7 MPa 69.3 MPa Rb 5.3 MPa 4 ( MPa) R 60 MPa Rb Fig.4 Distribution of under different initial stress states after 50 MPa exavation (positive for ompression stress MPa) 4 Russenes 5 III K K Rb / Russenes K K K K b / Rb / = 3 6 ( ) (5) Rb / 3 ( )

6 ( Russenes ) Table 4 Predition results of rokburst along the tunnel (aording to Russenes s riterion) (Referenes) []. [J]. 987 (5) R / MPa /MPa / R (Tao Zhenyu. Rokburst and evaluation method in high K K K K K K K K K K K K K K K K00+27 K00 27 K K K K K0+585 K0 585 K K K ground stress field[j]. Yangtze River 987 (5) (in Chinese)) [2] Kidybinski A. Bursting reliability indies of oal[j]. Int. J. Rok Meh. Min. Si. and Geomeh. Abstr 98 8(4) [3]. [J] (5) (Wang Yuanhan Li Wodong Lee P K K et al. Method of fuzzy omprehensive evaluations for rokburst predition[j]. Chinese Journal of Rok Mehanis and Engineering 998 7(5) (in Chinese)) [4]. [J] (5) (Feng Xiating. Adaptive pattern reognition to predit rokbursts in underground openings[j]. Journal of Northeastern University 994 5(5) (in Chinese)) [5]. [J] (2) (Chen Haijun Li Nenghui Nie Dexin et al. A model for predition of rokburst by artifiial neural network[j]. Chinese Journal of Geotehnial Engineering (2) (in Chinese)) [6]. [J] (4) (Yang Tao Li Guowei. Study on rokburst predition method based on the prior knowledge[j]. Chinese Journal of Rok Mehanis and Engineering (4) (in Chinese)) [7]. [J] (4) (in Chinese)) [8] [J] (8) Chinese)) [9] 999 6(4) (Xu Linsheng Wang Lansheng Li Tianbin. Present situation of rokburst researh at home and abroad[j]. Journal of Yangtze River Sientifi Researh Institute (Jiang Fanzhi Xiang Xiaodong Zhu Dongsheng. The urrent status and developing tendeny of rok blasting foreast at home and abroad[j]. Industrial Safety and Environmental Protetion (8) 9 22.(in. [J] () (Xu Linsheng. Researh of rokburst harater and prevention measure in Erlang mountain highway tunnel[j]. China Civil Engineering Journal () 6 64.(in

7 Chinese)) Standards Compilation Group of People s Republi of China. [0]. [J]. Speifiation for Survey of Highway Engineering Geology(JTJ (9) (Gu Mingheng He Faliang Chen Chengzong. Study on rokburst in Qinling tunnel[j]. Chinese Journal of Rok Mehanis and Engineering (9) (in Chinese) 98)[S]. Beijing China Communiations Press 999.(in Chinese)) [3]. [J] (2) (Shang Yuequan. The ways of determining boundary onditions in []. geomehanial numerial simulation[j]. Chinese Journal of Rok [J] () (Cai Meifeng Wang Jin an Wang Shuanghong. Analysis of energy distribution and predition of rokburst during deep mining exavation in Linglong gold mine[j]. Chinese Journal of Rok Mehanis and Engineering () (in Chinese)) Mehanis and Engineering 999 8(2) (in Chinese)) [4]. [J]. ( ) () (Sun Hongyue Shang Yuequan Zhang Chunsheng. Numerial modeling analysis for surrounding rokmass stability of large underground avities[j]. [2]. (JTJ Journal of Zhejiang University(Engineering Siene) () )[S] (The Professional (in Chinese)) ( ) ADINA () (2) (3) (4) (5) (6) (7) (8)

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