Geomechanics and Engineering

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Factors affecting particle breakage of calcareous soil retrieved from South China Sea

  • Wang, Xinzhi (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences) ;
  • Shan, Huagang (Shaoxing Traffic Investment Group Co., Ltd.) ;
  • Wu, Yang (School of Civil Engineering, Guangzhou University) ;
  • Meng, Qingshan (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences) ;
  • Zhu, Changqi (State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences)
  • Received : 2019.11.21
  • Accepted : 2020.06.17
  • Published : 2020.07.25
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Abstract

Calcareous soil is originated from marine biogenic sediments and weathering of carbonate rocks. The formation history for calcareous sediment includes complex physical, biological and chemical processes. It is preferably selected as the major fill materials for hydraulic reclamation and artificial island construction. Calcareous sands possess inter pores and complex shape are liable to be damaged at normal working stress level due to its fragile nature. Thus, the engineering properties of calcareous soil are greatly affected by its high compressibility and crushability. A series of triaxial shear tests were performed on calcareous sands derived from South China Sea under different test conditions. The effects of confining pressure, particle size, grading, compactness, drainage condition, and water content on the total amount of particle breakage for calcareous soil were symmetrically investigated. The test results showed that the crushing extent of calcareous sand with full gradation was smaller than that a single particle group under the same test condition. Large grains are cushioned by surrounding small particles and such micro-structure reduces the probability of breakage for well-graded sands. The increasing tendency of particle crushing for calcareous sand with a rise in confining pressure and compactness is confirmed. It is also evident that a rise in water content enhances the amount of particle breakage for calcareous sand. However, varying tendency of particle breakage with grain size is still controversial and requires further examination.

Keywords

Acknowledgement

This work was supported by the Strategic Priority Research Program of the Chinese Academy of Science (No.XDA13010203), and the National Natural Science Foundation of China (Nos.41572297, 41877267, 41372318 & 51908153), Guangzhou City Technology and Science Program (201904010278).

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