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| APPLICATION AND DOUBLE-DIRECTION CONTROL BOLT SUPPORT TECHNOLOGY OF LARGE SPAN Y-TYPE INTERSECTION IN DEEP COAL MINE |
| GUO Zhibiao1，2，WANG Jiong1，2，CAI Feng1，2，WANG Fuqiang1，2 |
| (1. State Key Laboratory of Deep Geomechanics and Underground Engineering，China University of Mining and Technology，Beijing 100083，China；2. Institute of Geotechnical Engineering，China University of Mining and Technology，Beijing 100083，China) |
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Abstract Under geological conditions at deep coal mine，the crossing roadway especially Y-type experienced large deformation. The junction pillar could be the weakest link. Based on in-situ investigation and theoretical study，typical forms of the destruction were summarized. High stress and unrestrained deformation at two sides of junction pillar were two main factors affecting the stability of the cross-section. Deep Y-type large cross-section junction double-control anchor support technology was proposed. The technology has been used in deep intersection engineering in Jiahe coal mine.
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Received: 04 January 2009
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