›› 2010, Vol. 31 ›› Issue (9): 2869-2874.

• Geotechnical Engineering • Previous Articles     Next Articles

Direct shear test for strength and deformation characteristics of highly decomposed hornfels

CHEN Jian-sheng1，CHEN Cong-xin1，LU Zu-de1，YAO Wen-sheng2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Shandong Nuclei Power Compay Ltd, Haiyang, Shandong 265100, China
  • Received:2009-08-20 Online:2010-09-10 Published:2010-09-16

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Abstract:

Through the field shear test of highly decomposed hornfels at the site of Lingao Ⅲ nuclear power project in Shenzhen, it is shown that the shear deformation of highly decomposed hornfels has some definite ductility. Its shear strength of highly decomposed hornfels decreases exponentially with the water content increase. The rock shear strength indices c and ? are weakened definitely by water. The natural hornfels has the characteristic of shear-thinning after dilatancy but saturated ones only shear-thinning during the experiment. We introduce the deformation index of shear stiffness to study the deformation characteristics of direct shear test and take the influence of water into account. It is shown that the shear stiffness increases with normal stress increase and decreases with its water content increase, especially in the condition of low normal stress. At the same time we analyse the influences qualitatively to the shear deformation with the changing shear stiffness, which has definite guidance for the slope stability analysis and the prediction of slope displacements.

Key words: direct shear test, highly decomposed hornfels, shear strength, shear stiffness

CLC Number: 

  • TU 456
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