围岩承载层分层演化规律及“层–双拱”承载结构强度分析

doi:10.13722/j.cnki.jrme.2019.0858

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Abstract Taking a typical deep soft rock roadway of Xinhu coal mine as the engineering background，the bearing structure of the surrounding rock is divided into fluid，plastic softening，plastic hardening and elastic layers according to the variations of stress and strength of the surrounding rock，and the plastic softening and hardening layers form a plastic bearing zone. A dynamic reinforcement support scheme is proposed which includes the first support of anchor net spray and the second reinforcement of shallow and deep hole grouting jointed bolts and cables，and a mechanical model of the layer-double arch bearing structure is proposed in combination with the characteristics of the support scheme. Under the limit equilibrium condition，the forces acting at the layer-double arch bearing structure are analyzed and a formula for calculating the ultimate bearing strength is obtained. The engineering calculation shows that the ultimate bearing capacity of the air returning cross-cut of Xinhu coal mine reaches 29.30 MPa after the surrounding rock is reinforced by the proposed support scheme and that the support scheme is reliable. The on-site monitoring results show that，after the dynamic reinforcement support，the surrounding rock deformation of the roadway tends to be stable with only 36 mm of the subsidence of the roadway roof and 67 mm of the displacement of roadway's two side walls，and that the roadway can maintain long-term stability.

Key words： rock mechanics deep soft rock roadway surrounding rock stress dynamic reinforcement support engineering practice layer-double arch bearing structure

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	Articles by authors
	LI Yingming1
	2
	ZHAO Chengxing1
	2
	LIU Zenghui1
	2
	MENG Xiangrui1
	2
	PENG Rui3

Cite this article:

LI Yingming1,2,ZHAO Chengxing1, et al. Research on layered evolution law of surrounding rock bearing layers and strength analysis of “layer-double arch” bearing structure[J]. , 2020, 39(2): 217-227.

URL:

http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0858 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I2/217

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