深部厚顶煤巷道让压型锚索箱梁支护系统现场试验对比研究

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Abstract Considering the situation of deep roadway of Juye mining area，of which the ground stress is high and the top coal is thick，and guided by the support idea，which is first anti-pressure，second pressure relief，third anti-pressure，high strength pressure relief anchor box beam(PRABB) support system was developed. PRABB support system has the advantage of low prestress loss，quantitative pressure relief，good supporting force transmission effects and a large contact area. Taking mine I-steel beam #12 and box support beam as trimmer beam respectively，two cross anchor beam support systems，two longitudinal single anchor beam support systems and two longitudinal double anchor beams support systems were designed. Taking deep thick top coal roadway of Zhaolou colliery as the engineering background，preliminary analysis of supporting effects of the support systems was produced by numerical test，and all the support systems were field-tested in crossheading of working face 3302. The field test results show that：(1) Six support systems are all better in controlling surrouding rock deformation than original support scheme. (2) Support effects of PRABB support systems are better than those of mine I-steel anchor beam support systems，and the roadway deformation of PRABB support systems is 15%–25% less than that of mine I-steel anchor beam support systems. (3) Among all the support systems，the longitudinal single anchor beam support systems are best in controlling surrounding rock，the longitudinal double anchor beams support systems take second place，the cross anchor beam support systems are relatively poor. Control mechanisms of different arrangement modes of beams are analyzed by test results. By longitudinal single anchor beam support systems，deformation of key position in thick top coal roadway is controlled well；it is helpful in making the best of self-bearing ability of surrounding rock and controlling roof deformation. In the deep thick top coal roadway supporting，longitudinal single anchor box beam support system is better for controlling surrouding rock deformation in a cost-effective way；so that the supporting demand is satisfied.

Key words： mining engineering thick top coal roadway pressure relief anchor box beam(PRABB arrangement mode numerical test field test

Received: 17 November 2011

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http://www.rockmech.org/EN/Y2012/V31/I4/656

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