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| ROCK SALT DAMAGE AND SELF RECOVERY CHARACTERISTICS UNDER SHEAR EXPERIMENT |
| CHEN Jie1，2，WANG Lei1，JIANG Deyi1，YANG Chunhe1，2，REN Song1 |
| (1. State Key Laboratory for Coal Mine Disaster Dynamics and Controls，Chongqing University，Chongqing 400044，China；2. 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 In order to study the recovery features of salt rock under shear damage，the incomplete shear tests of the domestic salt rock were performed. The stress-strain regularity and recovery ability under different loading ways were analyzed. The following conclusions are drawn. From the directional shear test results，it is observed that the shear strength of salt rock will not drop significantly at the initial stage，however the shear strength would drop significantly and quickly at the presence of repeated shear force from the opposite direction，which shows that the material is very sensitive to damage direction. By the comparative study of the shear tests on recovered and raw specimens，it is found that the effect of temperature on the recovery of rock salt material is very obvious. In the directional and unidirectional shear tests，stress strain curve of the damaged specimens tends to be similar to that of the original ones，which seems to indicate the relative capability of recovery for the shear damage.
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2015, Vol. 34 
