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Abstract The instability characteristics of the fracture hinged arch for rock plates were researched experimentally with the independent researched loading device based on MTS rock mechanics test system under concentrated load condition；and vertical load-displacement-horizontal reaction force curves were obtained through the experiments. The experimental results show that rock plate fractured in beam style and formed hinged arch with the increasing vertical load；at the same time，horizontal reaction forces generated at these hinge points. There are four distinct mechanical response stages in the vertical load-displacement-horizontal reaction force curves，which are initial adjustment before loading，rock plate fracture and forming hinged arch，pre-peak hardening and post-peak softening of rock arch load bearing. Based on the engineering mechanical model of hinged arch structure of rock plate，the relationship formula for bearing capacity and horizontal reaction force of rock arch structure is deduced；and the sensitivity analysis of load bearing of rock arch structure changing with rock plate parameters is conducted.
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Received: 14 March 2012
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2012, Vol. 31 
