岩体离层作用下锚杆受力特性全历程分析

doi:10.13722/j.cnki.jrme.2017.0238

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Abstract The full-range analysis on the mechanical characteristics of bolts in rock mass with bedding separation was performed with the bi-exponential model for anchorage interface to derive the nonlinear solution based on the load transfer method. The full-range mechanical characteristics of bolts including the relationships between the bedding separation and axial force，axial force distribution and shear stress were discussed. Validity of the proposed approach was verified by the experimental results. The results show that the calculated axial strain along the bolts has good agreement with the measured values. During the expanding process of bedding separation，the axial forces of the bolts increase initially and then decrease nonlinearly. The axial force and shear stress distribute unevenly along the bolts，and are transferred to both ends with the expanding of bedding separation. The location of bedding separation affects the mechanical characteristics of bolts significantly. The axial force and shear stress distribute symmetrically when the bedding separation locates at the middle of bolts. Otherwise，the axial force and shear stress show distinguishing distribution and evolution features at both sides，and the shear stress has a jump at the location of bedding separation. The interface with the shorter anchorage length yields the plastic deformation and even slipping failure in advance，which determines the bearing capacity of bedding separation and tensile load of bolts.

Key words： geotechnical engineering bolt bedding separation mechanical characteristics bi-exponential model full-range analysis

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	HUANG Minghua
	LI Jiacheng
	ZHAO Minghua
	CHEN Changfu

Cite this article:

HUANG Minghua,LI Jiacheng,ZHAO Minghua, et al. Full-range analysis on mechanical characteristics of bolts in rock mass with bedding separation[J]. , 2017, 36(9): 2177-2184.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0238 OR http://www.rockmech.org/EN/Y2017/V36/I9/2177

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