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| EXPERIMENTAL INVESTIGATIONS AND MECHANISM ANALYSIS ON THE ANCHORING EFFECT OF PRE-STRESSED BOLT OF SLABBING SURROUNDING ROCK IN DEEP TUNNEL |
| ZHOU Hui，XU Rongchao，LU Jingjing，ZHANG Chuanqing，MENG Fanzhen，SHEN Zheng |
| (State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract Model specimens of slabbing failure were made by using high-strength gypsum and pre-stressed bolt model were made by aluminum bar，the reinforced effect of bolt on the model specimens is studied under the condition of one lateral side restraint uniaxial loading test. The results show that：the peak strength，residual strength and elastic modulus of reinforced specimens increase at different degree，the lateral deformation after peak strength decrease dramatically， the effect is more obvious with the increase of pre-stress of bolt；different with the bulcking failure of slabs and ejection of slices of the unstability destruction phenomenon of unreinforced specimens， the reinforced specimens remains better integrated with local breakage and fall off of slab；the change of the axial stress of bolt during the deformation of specimens can be divided into three stages：the linear slow growth stage，nonlinear growth stage and sharp rising stage，the change rule of the axial stress of bolt reflect its working mechanism and the deformation characteristics of the specimens. The anchoring mechanisms are analyzed：the applying of pre-stressed bolt not only effectively weaken the concentration effect of stress near crack tip，playing the role of restraining the propagation of pre-existing fissures but also significantly restrict the bulcking deformation of slabs by reinforcing the splitting rock slabs into a whole，playing the role of improving the critical buckling load values of the slabbing specimens. At last，based on the results and perceive of the experiments，a“timely supporting，regional control and key area reinforcement”anchor spray support control strategy is put forward against to the control of slabbing surrounding rock.
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2015, Vol. 34 
