Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (S1): 268-276.doi: 10.16285/j.rsm.2022.0405

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Microstructure and one-dimensional compression characteristics of deep-sea diatomite

HONG Yi1, 2, 3, ZHENG Bo-wen1, 3, 4, YAO Meng-hao2, 3, WANG Li-zhong1, 2, SUN Hai-quan4, XU Dong5, 6   

  1. 1. College of Oceanology, Zhejiang University, Zhoushan, Zhejiang 316022, China; 2. College of Civil Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. Zhejiang Key Laboratory of Marine Geotechnical Engineering and Materials, Zhejiang University, Hangzhou, Zhejiang 310058, China; 4. China Hainan Research Institute, Zhejiang University, Sanya, Hainan 572025, China; 5 The Second Institute of Oceanology, Ministry of Natural Resources, Hangzhou, Zhejiang 310012, China; 6. Key Laboratory of Seabed Science, Ministry of Natural Resources, Hangzhou, Zhejiang 310012, China
  • Received:2022-03-30 Accepted:2022-08-24 Online:2023-11-16 Published:2023-11-17
  • Supported by:
    This work was supported by National Natural Science Foundation of China (52122906, 52238001, 52271294), the Major Science and Technology Project of Hainan Province (ZDKJ202019) and the Key R&D Project of Zhejiang Province (LHZ20E090001).

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Abstract: At present, the microstructure and compression characteristics of marine soft soils in onshore and shallow seas are widely studied, while those of deep-sea soft soils are less studied. However, with the development of marine engineering to deep water, the characteristics of deep-sea soft soils deserve attention. Diatomite is widely distributed in the deep sea and it is a kind of deep sea soft soil. It has diversity and does not follow the characteristics of classical soft soil laws. Currently, there are few studies on in-situ undisturbed samples. To investigate the microstructures, compression characteristics and secondary consolidation properties of deep-sea diatomite, scanning electron microscope (SEM) analysis, mercury intrusion porosimetry (MIP) tests, traditional oedometer tests and multistage oedometer tests (7-day loading for each stage) were carried out on diatomite sampled from the western Pacific Ocean at the depth between 4 423 and 4 674 meters. The experimental results show that the compression index of deep-sea diatomite ranges from 1.7 to 1.95, which is about 0.6 to 1.2 larger than that of other terrestrial and shallow marine soft soils. In addition, in the creep stage after consolidation, diatomite still has volume deformation for a long time, and there is no stable trend of deformation convergence, which may be caused by the continuous breaking of the shell of diatom particles. This hypothesis has been confirmed by SEM and MIP tests observation results in the loading stage.

Key words: deep-sea diatomite, microstructure, one-dimensional compression characteristics, creep characteristics；particle breakage, macro and micro combination

CLC Number: 

  • TU 411
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