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Geomechanics and Engineering
  Volume 22, Number 2, July25 2020, pages 173-185

Factors affecting particle breakage of calcareous soil retrieved from South China Sea
Xinzhi Wang, Huagang Shan, Yang Wu, Qingshan Meng and Changqi Zhu

    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.
Key Words
    shear strength; particle breakage; water content; triaxial test; gradation
Xinzhi Wang, Qingshan Meng and Changqi Zhu:State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics,
Chinese Academy of Sciences, Wuhan, Hubei 430071, China

Huagang Shan: Shaoxing Traffic Investment Group Co., Ltd., Shaoxing, Zhejiang 312000, China

Yang Wu:School of Civil Engineering, Guangzhou University, Guangzhou, Guangdong 510006, China

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