Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 493-503.doi: 10.13278/j.cnki.jjuese.20170226

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Experiment on Pore Structures of Malan Loess at Different Buried Depth

Li Lincui1, Li Xi'an1,2, Hong Bo1, Wang Li1   

  1. 1. College of Geology Engineering & Geomatics, Chang'an University, Xi'an 710054, China;
    2. Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Xi'an 710054, China
  • Received:2017-11-30 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China (41172255,41572264,41440044,41877225)

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Abstract: Loess samples were prepared using pore-filling method to observe and analyze their microstructures. The pore structures and the change with depth increase were analyzed by scanning electron microscope and digital image analysis system. The five samples belong to porous soil according to the void ratio or pore area ratio. The results indicate that the connectivity of loess pore decreased with depth increase gradually, the pore structure changed from unstable overhead macro pores or mesopores into stable small or micro mosaic pores,and quantitatively, the area of macro pores and mesopores decreased by 63.04%, while the area of small pores and micro pores increased by 40.57% and 22.47% respectively. By analyzing pore shapes, the area change of micro pores, small pores, mesopores and macro pores mentioned above was resulted from the area change of elongated or irregular pores. From the area point of view, in the micro pores, small pores, mesopores and macro pores, the elongated pores were dominant, and the number of all these four kinds of pores decreased in turn significantly. This is mainly determined by the number of round pores, indicating that the round pores are small.

Key words: Malan loess, scanning electron microscope, pore classification, pore size distribution, pore shape distribution

CLC Number: 

  • P642.13
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