›› 2009, Vol. 30 ›› Issue (12): 3783-3787.

• Geotechnical Engineering • Previous Articles     Next Articles

Field shearing test for heavily weathered hornstone of Three Phase Project of Ling'ao Nuclear Power Station

LU Zu-de1, CHEN Cong-xin1, CHEN Jian-sheng1, TONG Zhi-yi1, ZUO Bao-cheng2, DAI Xu-ming2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Guangdong Electric Power Design Institute, Guangzhou 510663, China
  • Received:2009-03-08 Online:2009-12-10 Published:2010-01-18

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Abstract:

By using the method of preloading as vertical reaction, the field shearing test of heavily weathered hornstone side slope rock mass are carried out under the natural and the saturated condition. the shear stress – shear deformation relation curves under different normal stress levels and shear strength parameters are obtained. Based on the results of field shearing test, the effect of strength and deformation on mechanical-hydro coupling process and the change rule of the shear stress along with different normal stresses and the shear stress-deformation relation curves characteristics are analyzed. The test results indicate that, the peak shear strength and the yield shear strength increase with the increase of the normal stress; and the change of water content has not influence on the change rule of the shear stress along with different normal stresses. The shear strength decreases with the increase of water content; and it is especially sensitive under the low normal stress. Attenuated function for cohesive force of water is more obvious, and simultaneously has enlarged the rock mass amount of deformation and lengthened the rock mass distortion process. Modulus of compression of rock mass can be estimated by vertical deformation tested in the field shearing test.

Key words: heavily weathered hornstone, side slope rock mass, field shearing test, strength, stress-strain relationship

CLC Number: 

  • TU 458
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