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Abstract According to the principle of equivalent deformation，the theoretical formula which can calculate the deformation modulus of jointed rock mass is derived. A new graphics called full space exhibition map is introduced，which can show the space distribution characteristics of parameters through the contour. Using the theoretical formula and full space exhibition map，a new method which can study the space distribution of the rock mass deformation modulus is formed. Using this method，the structure effect of jointed rock mass with one，two and three joint has been systematically researched. When the rock mass is cut by one joint set，the deformation modulus is the biggest in the direction which is parallel to the joint plane and presents as an extreme value line in the full space exhibition map，while the deformation modulus is the smallest in the direction which is vertical to the joint plane and present as an extreme value point in the full space exhibition map. When the rock mass is cut by two joint sets，the deformation modulus is the biggest in the direction of the intersection point of the two extreme value lines，while the deformation modulus is the smallest in the direction which is between the two extreme value points，in the full space exhibition map. When the rock mass is cut by three joint sets，the direction of the biggest deformation modulus is in the smallest triangle enclosed by the three extreme value lines，while the direction of the smallest deformation modulus is in the triangle enclosed by the three extreme value points，in the full space exhibition map. The weakened degree of deformation modulus becomes significant as the number of joint sets increasing. Because of the simple computational process and the obvious advantage of the space distribution characteristics，this method to evaluate the rock mass deformation modulus provides useful reference in the three dimensional full space.
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Received: 18 February 2011
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2011, Vol. 30 
