›› 2009, Vol. 30 ›› Issue (S2): 192-195.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Micro and fine analysis of expansion mechanism of weathering red sandstone in Hongshanyao

HE Shan 1,2, ZHU Zhen-de3, HAN Li-jun2, WANG Si-jing3   

  1. 1.Yancheng Institute of Technology, Yancheng 224051, China; 2.China University of Mining & Technology, Xuzhou 221116, China; 3. Hohai University; Nanjing 210098, China
  • Received:2009-08-18 Online:2009-08-10 Published:2011-06-21

Abstract:

The water swelling whole process of different weathering degrees swelling red sandstone with whole weathered, strong weathered, intermediary weathered and weak weathered was revealed in micro and fine by scanning electron microscope and digital image technique and amplifying the particle composition structure diagram before and after weathering 300 times. The water swelling whole process includes: water absorption→hydration→volume increased→producing expansive force→expansive force over limit→disintegration. It was viewed from this course that the hydrophilic of part mineral in swelling rock was the reason of swelling deformation characteristics. Encountering water, the hydration reaction of hydrophilic mineral led to volume enlarging and expansion stress. When the expansion stress was more than cement cohesive force, the disintegration would generate. The weathering degree was higher, and the process of water swelling was more quickly, and the time of reaching disintegration was shorter.

Key words: swelling rock, weathering, microstructure, hydration, expansive force

CLC Number: 

  • TU 443
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