›› 2013, Vol. 34 ›› Issue (1): 23-30.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on mechanical properties of swelling diatomite and their geohazard effects

ZHANG Yong-shuang1, 2，GUO Chang-bao1, 2，QU Yong-xin3，YAO Xin1, 2   

  1. 1. Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China; 2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2011-11-28 Online:2013-01-10 Published:2013-01-10

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Abstract: Slope stability problems related with the swelling diatomite are met during the construction of Baoshan-Tengchong highway in Yunnan province. After field investigation of the typical geological sections and laboratory tests of composition, microstructure and mechanical properties on the samples from Wuhe town, Mangbang town, Tuantian town of Tengchong county, Yunnan province, it is revealed that the Neogene diatomite in the Mangbang formation is a type of clayey diatomite with rich swelling clay minerals, and belongs to very soft swelling rock. Natural clayey diatomite samples have strong structural properties, which lead to the relationship between their physical properties and mechanical properties against the traditional rock/soil mechanics laws. For example, the samples have void ratio up to 2.20-2.78, liquid index 0.66-2.73, while their uniaxial compressive strength can be up to 1.09-2.11 MPa. Comprehensive researches indicate that the occurred geo-hazards including landslides and weather-flaking of clayey diatomite slope along the Baoshan-Tengchong highway are closely related to their engineering properties.

Key words: swelling, clayey diatomite, mechanical property, structural property, highway slope

CLC Number: 

  • TU 411.7
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