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| DETERMINING LONG-TERM STRENGTH OF ROCK WITH DISCONTINUITY USING SHEAR STRESS RELAXATION TEST |
| LIU Ang1，2，SHEN Mingrong1，JIANG Jingcai2，ZHANG Qingzhao1 |
| (1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Department of Civil and Environmental Engineering，The University of Tokushima，Tokushima 700–8506，Japan) |
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Abstract To study the characteristics of shear stress relaxation of rock with a structural plane and the connection between the stress relaxation and the long-term strength，the samples with artificial joint surfaces based on the 4th，6th，and 10th discontinuity lines from Barton′s ten standard lines were made using cement mortar. The shear stress relaxation tests under cyclic loading with the shearing loading value larger than the long-term shear strength were conducted with the biaxial rheological testing machine. The shear stress relaxation was studied based on the test results. The mechanism of interaction between the stress relaxation and the creep was discussed，and a stress relaxation method was proposed to determine the long-term strength.
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Received: 29 August 2013
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2014, Vol. 33 
