Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 839-847.doi: 10.13278/j.cnki.jjuese.201703204

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Experimental Study on Porosity Characteristics of Loess Under Freezing-Thawing Cycle

Zhang Ze1, Zhou Hong2,3, Qin Qi3,4, Bing Hui1, Wu Junjie1, Zhou Panfeng5   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. Shanghai Jianke Engineering Consulting Co., Ltd., Shanghai 200032, China;
    3. College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
    4. Shanghai Puqiao Engineering Construction Management Co., Ltd., Shanghai 200032, China;
    5. Guangzhou Academy of Nuclear Engineering Investigation, Guangzhou 510800, China
  • Received:2016-09-07 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by National Natural Science Foundation of China (41301070,41401087,4101072), the Scientific and Technical Projects of the Transport Department of Gansu Province (2014-03) and Open Fund Project of Qinghai Traffic Science Research Institute (2016-01-04)

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Abstract: Shaanxi Fuping remolded loess was taken as the studied object. Mercury instrusion porosimetry was used to research the porosity characteristics of loess after different freezing-thawing cycles to get the changing rule of the distribution of loess porosity. Test results showed that rearrangement of the soil particles occurred under freezing-thawing cycle, and pore structure changed. At the same time, the number of pores with small size (especially pores of 0.01-0.10 μm) gradually decreased, and the number of pores with large size (especially pores of 5.00-10.00 μm) increased. During the first 10 cycles, the change in pore size distribution was unstable, and with the increase in freezing-thawing cycles, it became clearly. Porosity increased with the increasing freezing-thawing cycles, and reached its peak value after only 8 freezing-thawing cycles, and then it decreased and became stable after 50 cycles. Finally, according to test results and pore fractal dimension, the inhomogeneity and complexity of pore were decreased by the freezing-thawing cycle.

Key words: loess, freezing-thawing cycle, mercury intrusion method, pore distribution, pore fractal

CLC Number: 

  • P642.131
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