硬岩层爆及锚杆锚固机制试验研究

doi:10.13722/j.cnki.jrme.2017.0373

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Abstract The mechanism of fracture development and bolt anchoring of roadway(tunnels) rockburst have not been fully studied. The bi-axial compression tests to the rectangular hard rock samples with and without anchoring were carried out using the true three axis loading and unloading test system developed in-house. The development of stratified burst of hard rock and the mechanism of bolt anchoring were discussed. The layer burst phenomenon occurred in the hard rock tests. The fractal dimension of burst surface from the free surface to deep was mainly between 1.3 and 1.8. The fractal dimension of burst surface was reduced by the enhancement of the frictional action of the burst surface. The dominated fracture form was gradually transited from the tension fracture to the shearing fracture. Each layer was more or less accompanied by the secondary layer fractures at the same time. The number and extent of bursts were greatly reduced by the bolt anchoring and the layer by layer burst of hard rock was restricted. A formula for the number of layers undergoing burst near the surface was obtained through theoretical analysis. The rock with the stratified burst was considered as the layered rock and the composite beam theory for bolt control was proposed. The stratified burst was mainly the result of tension due to compression. The tensile strength of the intact rock was greatly improved and the number and scope of the stratified burst were greatly reduced by the bolt anchoring.

Key words： rock mechanics hard rock stratified burst bolt anchoring biaxial compression test fractal dimension

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	Articles by authors
	ZHANG Xiaojun1
	2
	LIN Qianjun1
	2
	LIU Guolei1
	2

Cite this article:

ZHANG Xiaojun1,2,LIN Qianjun1, et al. Experimental study on mechanism of stratified burst bolt and anchoring in hard rocks[J]. , 2017, 36(10): 2365-2372.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0373 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I10/2365

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