Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (2): 455-464.doi: 10.16285/j.rsm.2017.1450

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Meso-damage and mechanical properties degradation of sandstone under combined effect of water chemical corrosion and freeze-thaw cycles

YU Jin1, 2, ZHANG Xin1, CAI Yan-yan1, 2, LIU Shi-yu1, TU Bing-xiong1, FU Guo-feng1   

  1. 1. Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen, Fujian 361021, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China
  • Received:2017-07-11 Online:2019-02-11 Published:2019-02-13
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51874144, 51679093, 51774147), the Program for New Century Excellent Talents in University of Fujian Province of China, the Program for Outstanding Youth Scientific Research Training in University of Fujian Province of China and the Open Research Fund of State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (SKLGDUEK1701).

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Abstract: The aim of this study is to investigate the meso-damage and degradation mechanism of sandstone under the combined effect of water chemical corrosion and freeze-thaw cycles. Nuclear magnetic resonance (NMR) and uniaxial compression tests were conducted on the sandstone treated by acidic, neutral and alkaline solution immersion and freeze-thaw cycles, respectively. The variations of porosity and mechanical parameters of sandstone were analysed. With increasing immersion time in hydro-chemical solution, the strength and elastic modulus of sandstone decrease, and the maximum decrement occurs in specimens immersed by the acidic solution. With the increase of freeze-thaw cycles, the strength and elastic modulus significantly decrease, and the maximum decrement occurs in specimens immersed by the neutral solution. The porosity component of a small pore is trivially affected by water chemical corrosion, but significantly influenced by the freeze-thaw cycle. Moreover, the increase of small pore size porosity component in different solutions is close to each other. Both soaking and freeze-thaw cycle in hydrochemical solution greatly impact on the large pore-size porosity components of sandstone. Chemical corrosion has the greatest effect on the sandstone in acid solution, while the neutral solution largely affects the specimen under the interaction of chemical corrosion and freeze-thaw erosion. Under the condition of freeze-thaw cycle of hydrochemical solution, the micro-structure of small-pore sandstone is mainly damaged by frost heave, while that of large-pore sandstone is mainly damaged by chemical corrosion and frost heave. In terms of porosity, the superposition effect of frost heave and corrosion is manifested comprehensively. In the micro-structure of large-pore sandstone, the superposition effect of acid and alkali corrosion on the meso-structure of large-pore sandstone and frost heave is restrained to a certain extent. There exists a good correlation between initial fracture volume change and nuclear magnetic porosity change rate.

Key words: sandstone, water chemical corrosion, freeze-thaw cycle, combined effect, meso-damage, mechanical properties degradation

CLC Number: 

  • TU 452
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