Treatment of Boulders Encountered in Shield Tunneling under Different Geological Conditions

doi:10.3973/j.issn.1672-741X.2012.04.025

Tunnel Construction ›› 2012, Vol. 32 ›› Issue (4): 571-575.DOI: 10.3973/j.issn.1672-741X.2012.04.025

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Treatment of Boulders Encountered in Shield Tunneling under Different Geological Conditions

WANG Penghua

(Taishan Nuclear Power Joint Venture Co., Ltd., Taishan 529228, Guangdong, China)

Received:2012-04-27 Revised:2012-05-18 Online:2012-08-20 Published:2012-10-16

Abstract

Abstract: Boulder is a kind of weathered granite core. The diameter of boulders ranges from dozens of centimeters to several meters and the uniaxial compressive strength of boulders can reach 200 MPa. The treatment technologies for boulders encountered in shield tunneling in Peal River Delta and in Taishan are analyzed, and the experience in boulder treatment is summarized, so as to minimize the risk of shield tunneling in ground containing boulders. The paper can provide reference for similar projects in the future.The treatment technologies inchuding underground deep hole blasting, freezing,hole punching and hole cutting,groundsurface grouting and cutting by shield machines.

Key words: shieldbored tunnel, boulder, Metro, granite, deep hole blasting

WANG Penghua. Treatment of Boulders Encountered in Shield Tunneling under Different Geological Conditions[J]. Tunnel Construction, 2012, 32(4): 571-575.

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Treatment of Boulders Encountered in Shield Tunneling under Different Geological Conditions

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