Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (4): 1095-1122.doi: 10.16285/j.rsm.2019.0613

• Fundamental Theroy and Experimental Research •     Next Articles

Advances in research on microstructure and intergranular suction of unsaturated soils

SUN Yin-lei1, 2, TANG Lian-sheng1, 2, LIU Jie1, 2   

  1. 1. School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, China; 2. Guangdong Provincial Key Lab of Geodynamics and Geohazards, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
  • Received:2019-04-01 Revised:2019-07-15 Online:2020-04-11 Published:2020-07-01
  • Contact: 汤连生，男，1963年生，博士，教授，博士生导师，主要从事非饱和土力学方面的研究工作。E-mail: eestls@mail.sysu.edu.cn E-mail:sunylei@mail2.sysu.edu.cn
  • Supported by:
    This work was supported by the General Program of National Natural Science Foundation of China (41877229), the Guangdong Basic and Applied Basic Research Foundation (2018B030311066, 2019A1515010554), the China Postdoctoral Science Foundation (2019M663241) and the Fundamental Research Funds for the Central Universities (20lgpy39).

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Abstract: Suction is a focus of unsaturated soil research and investigation on suction is challenging. Many physical phenomena in nature can be explained by suction, and the research challenge is that the quantitative measurement technology of unsaturated soil suction is immature. Unsaturated soil, as a three-phase composite material widely exists on the earth surface, has far more complicated mechanical properties than saturated soil. The main reason is that a curved liquid surface contraction film is formed at the water-air interface in the unsaturated soil, which causes the soil pores to produce suction. The strength and deformation characteristics of unsaturated soil are the macroscopic manifestations of its internal suction, and the microstructure serves as a bridge to connect macroscopic physical and mechanical properties with suction. It is an important way to improve soil mechanics to grasp the microstructure of unsaturated soil as well as the theory and experiment of suction. It is pointed out that the research on the dynamic structure evolution of unsaturated soil-liquid bridge and the distribution characteristics of suction force chain is an important basis to fully understand the mechanical properties of unsaturated soil, and it is also an important means to grasp and quantify the suction of unsaturated soil.

Key words: unsaturated soil, micro-structure, intergranular suction, liquid bridge, particle contact

CLC Number: 

  • TU 432
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