海下强膨胀软岩动压巷道恒阻让压耦合支护技术研究

doi:10.13722/j.cnki.jrme.2017.0976

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Abstract

To solve the problems such as large deformation at the initial stage of excavation，large deformation of the whole section and serious destruction of U steel support caused by the dynamic pressure in the strong swelling soft rock roadway in the Beizao coal mine，the instability mechanism of low strength，strong expansion，strong water absorption softening，surrounding rock pressure，non coupling between support and surrounding rock deformation is revealed by means of microscopic physical analysis and in-situ stress test. The constant resistance bolt support method was put forward，and the support mechanism of the constant resistance anchor bolt can be supported by the high resistance，high pre tightening force，deformation and pressure release structure to support the strong swelling soft rock. Finally constant resistance supporting scheme for pressure coupling consisted of the anchor beam structure strengthening roof + constant resistance anchor reinforcing for two sides + grouting anchorage reinforcing bottom was proposed. Numerical simulation is used to compare and analyze the supporting effect. The test results show that the constant resistance pressure coupling support can greatly reduce the deformation of roadway surrounding rock and the influence range of leading dynamic pressure，the maximum deformation is 282 mm，ahead of the dynamic pressure distance is 70 m. Compared with the ordinary steel bolt and anchor beam support deformation，the deformation reduced by 64.8% and the dynamic pressure influence distance reduced by 10 m，compared with the U type steel frame shed，the deformation reduced by 54.7%，and the dynamic pressure influence range decreased by 20 m. It has good popularization and application value in similar soft rock roadway.

Key words： mining engineering soft rock under sea constant resistance bolt numerical simulation coupling support

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	Articles by authors
	CAI Feng1
	2
	3
	SUN Xiaoming1
	2
	WANG Jiong1
	2
	ZHOU Feng4

Cite this article:

CAI Feng1,2,3, et al. Constant resistance coupling support technology of dynamic pressure roadway under sea with strongly swelling soft rock[J]. , 2017, 36(S2): 3957-3964.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0976 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/3957

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