软岩巷道交岔点钢管混凝土组合支架支护技术研究

doi:10.13722/j.cnki.jrme.2021.0679

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Abstract In order to solve the problem of intersection support of expansive soft rock roadways，taking the intersection point of the main inclined shaft and #2 coal feeder maintenance connecting roadway of Qingshuiying coal mine as the engineering background，and based on the analysis of the geological characteristics and deformation causes of the intersection，the repairing support design based on rectangular concrete-filled steel tube composite support is proposed. Through the numerical simulation analysis of the support bearing capacity，it is found that the flexural bearing capacity of the straight beam section of the composite support is insufficient，which affects the overall support effect. The bending test of the concrete-filled steel tubular straight beam is carried out. The results show that the welding bending round steel in the tensile area of the straight beam can effectively improve the bearing capacity of the concrete-filled steel tubular straight beam. The structure of the rectangular composite support is optimized with f50 mm bending round steel. The simulation analysis shows that the overall
bearing capacity of the optimized composite support is increased by 36%. In engineering practice，the support scheme based on the rectangular concrete-filled steel tube composite support has no obvious deformation in three years of using，and the intersection point of the expansion soft rock roadway remains stable for a long time. The research has an important guiding significance for the intersection point support under similar conditions.

Key words： rock mechanics soft rock roadway intersection concrete-filled steel tube combined support numerical simulation bending strengthening

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	Articles by authors
	WANG Jun1
	2
	3
	LU Wenyan1
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	XING Luyi1
	YANG Guang1
	WANG Zhikang2

Cite this article:

WANG Jun1,2,3, et al. Research of supporting technology of concrete-filled steel tubular composite support at intersection point of soft rock roadways[J]. , 2022, 41(3): 573-586.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0679 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I3/573

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