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| Experimental investigation on the damage characteristics of freeze-thaw limestone by the uniaxial compression and acoustic emission monitoring tests |
| SONG Yanqi1，2，MA Hongfa2，LIU Jichen2，LI Xiangshang2，ZHENG Junjie2，FU Hang2 |
(1. State Key Laboratory for Geo-Mechanics and Deep Underground Engineering，China University of Mining and Technology (Beijing)，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of Mining and
Technology(Beijing)，Beijing 100083，China) |
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Abstract In order to explore the evolution law of mechanical properties of limestone and progressive damage characteristics of internal meso structure under the effects of freeze-thaw and uniaxial load，the uniaxial compression and acoustic emission monitoring tests of limestone with different freeze-thaw cycles were carried out. Firstly，the physical and mechanical parameters evolution law was obtained. Then，the correlation between acoustic emission signal and microcrack activity in freeze-thaw limestone was analyzed. Meanwhile，the damage cumulative change rule was quantitatively studied. Finally，the deterioration mechanism of freeze-thaw damage of limestone was clarified. The results show that the uniaxial compressive strength，elastic modulus and Poisson?s ratio of limestone decrease gradually with the increase of freeze-thaw cycles，and accompanied with the final discount rate to 61.43%，48.42% and 17.33%，respectively. However，there is gradual increase in the peak strain. The acoustic emission ringing count change process can be divided into calm stage，growth stage，and steep increase stage. As the increase of freeze-thaw cycles，the uniaxial acoustic emission signal of limestone is active with the local high-density released characteristics，and the acoustic emission b value presents a “V”-shaped change. Meanwhile，the local sudden drop of the dynamic b value indicates that large-scale cracks have been generated. Moreover，the type of internal microcracks in the limestone converts from shear to tensile，which contributes to the failure change from shear to split. The damage variables of limestone，which presents with a trend of abrupt or gradual mutation after 0，10 and 20 freeze-thaw cycles，increase gradually after 40，60 and 80 freeze-thaw cycles. In addition，the main causes of freeze-thaw damage of limestone are the volume expansion of pore and fissure structures caused by water-ice transformation，meso hydraulic fracture caused by local ice accretion and the free hydrodynamic response.
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2022, Vol. 41 
