›› 2006, Vol. 27 ›› Issue (5): 723-729.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study on unloading and relaxation characteristics of the rockmass of permanent shiplock high rock slope of three gorges project

SHI An-chi, XU Wei-ya, ZHANG Gui-ke   

  1. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China
  • Received:2005-03-21 Online:2006-05-10 Published:2013-11-05

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Abstract: The rock mass of permanent shiplock high rock slope of the Three Gorges Project(TGP) has marked characteristics of unloading and relaxation. Kinds of methods such as geological investigation, sonic velocity test, monitor of deformation, in-situ test of elasticity modulus of rock mass, test of rock permeability, kinescope in hole, test of elasticity modulus of rock mass in hole, etc., have been applied to studying the characteristics. The study shows that the rock mass of the slope can be divided into three zones, strong-unloading zone, middling-unloading zone and slight-unloading zone. The degeneration of properties of rock mass in strong-unloading zone and middling-unloading zone is notable，while degeneration of properties of slight-unloading rock mass is not obvious. The structure and properties of the rock in unloading zone do not alert obviously; but the unloading causes the growth of the joints’ length and width. The deformation of rock mass of the slope mainly depends on the deformation of joints and elastic deformation of rock block, which is affected by excavation. The reinforcement cables have obvious effect on confining deformation of joints.

Key words: TGP, permanent shiplock, high rock slope, unloading and relaxation, monitor and test, division of unloading zones

CLC Number: 

  • TU 457
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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