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Abstract Indoor tensile experiment and field application were carried out in order to study the tensile properties of constant resistance and large deformation(CRLD) bolts. The static tensile experiment system of CRLD developed by Professor He Manchao was used. The experimental data of the support capacity，the bolt elongation，the radial deformation and energy absorption were analyzed. The results of the experiments and the application show that the CRLD bolt provides constant resistance in the course of large deformation of surrounding rock，achieves the controllable release of deformation energy of the rock，and attains the stability of roadway through the combined action of supporting body and surrounding rock. The salient properties of CRLD bolts of providing high and constant support resistance，capable of large deformation，expanding radial and having good ability of absorbing energy makes it an effective measure of safety control in the engineering practice of soft rock and deep roadway.
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Received: 28 April 2014
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2014, Vol. 33 
