Field Test Experimental of Tunnel Surrounding Rock Loosing Circle of Deep Well and Supporting Scheme Improvement

Abstract

Abstract: Coal and rock of tunnel periphery deformation and failure occurs, surrounding rock will be broken and cracked, and then loose circle formed after excavation of tunnel surrounding rock stress distribution again, when stress is more than the limit of coal and rock stress.Loose circle will be influenced by strength of surrounding rock, original rock stress size, tunnel section, excavation and supporting of tunnel.Based on the electromagnetic wave propagation in GPR loose circle detection mechanism analysis rock loose circle was detected in different position of track tunnel, surrounding rock loose circle is in the range of 1.1 m to 1.6 m.According to the test results, the supporting scheme of pillar improves.

Key words: Pillar, Geological radar, Loose circle, Field test, Supporting scheme

JIANG Bang-You, GU Shi-Tan, LI Nan-Nan, WANG Chun-Qiu. Field Test Experimental of Tunnel Surrounding Rock Loosing Circle of Deep Well and Supporting Scheme Improvement[J]. Metal Mine, 2012, 41(09): 13-15+56.

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Field Test Experimental of Tunnel Surrounding Rock Loosing Circle of Deep Well and Supporting Scheme Improvement

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