Mechanism of Rockburst of Qamchiq Tunnel in Uzbekistan

doi:10.3973/j.issn.1672-741X.2016.03.005

Tunnel Construction ›› 2016, Vol. 36 ›› Issue (3): 275-281.DOI: 10.3973/j.issn.1672-741X.2016.03.005

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Mechanism of Rockburst of Qamchiq Tunnel in Uzbekistan

DENG Wei¹, LIU Chengyu², LI Hongjun³, GUO Zhiwu³

(1. The First Construction Division Co., Ltd. of China Railway Tunnel Group, Chongqing 401123, China; 2. Fuzhou University, Fuzhou 350116, Fujian, China; 3. China Railway Tunnel Group Co., Ltd., Luoyang 471009, Henan, China)

Received:2015-06-23 Revised:2015-08-08 Online:2016-03-20 Published:2016-03-30

Abstract

Abstract:

The rockburst mechanism of Qamchiq tunnel on Angren to Pop railway in Uzbekistan is analyzed on the basis of rockburst laws and the geological conditions of the tunnel. The study results show: 1) The surrounding rocks (granodiorite and syenite porphyry) and horizontal residual tectonic stress in the surrounding rocks are the main causes for the rockburst of Qamchiq tunnel. 2) The rockburst occurs to the tunnel beneath the cover depth of 40 m. 3) The rockburst occurs to the crownhance is mainly related to the maximum principal stress (horizontal ground stress). 4) The rockburst mode of the tunnel can be divided into 4 types， i.e. fiaky rock ejection, breakdown of nearly horizontal bedded rock, rock breakout+rock collapse and platy rock breakdown in side wall.

Key words: tunnel, rockburst, forming mechanism, residual tectonic stress

CLC Number:

U 45

DENG Wei, LIU Chengyu, LI Hongjun, GUO Zhiwu. Mechanism of Rockburst of Qamchiq Tunnel in Uzbekistan[J]. Tunnel Construction, 2016, 36(3): 275-281.

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Mechanism of Rockburst of Qamchiq Tunnel in Uzbekistan

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