(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：On the basis of an improved joint model containing joint spacing，the influence of joint spacing，joint angle and confining pressure on rock mass stress-strain curve，strength have been carried out. The results show that：(1) When joint spacing increases to a certain extent，the rock mass strength is equal to the rock strength，and when joint spacing decreases to a certain extent，the rock mass strength is equal to the ubiquitous joint strength. (2) Joint spacing has a great influence on the three stages of the rock mass stress-strain curve：the elastic deformation，yield strength and residual strength are all increased with the increase of joint spacing. (3) If the confining pressure is increased，the rock mass degradation characteristics induced by joint is abate，and the joint spacing which reach the rock strength or ubiquitous joint strength，decreases with the increased confining pressure. (4) When a joint plane angle is less than or greater than ，the rock mass would not crack along the joint plane，and even if the joint spacing is changed，the strength would not change under this angle. When the joint plane angle is greater than and smaller than ，the rock mass would crack along the joint plane，and with the increase of joint spacing，the rock mass strength would increase. (5) The first type of columnar joints can be consider as ubiquitous joint model，but the second or third type of columnar jointed rock mass can't be considered as ubiquitous joint model due to their larger joint spacing. The columnar jointed model containing joint spacing proposed by this paper is more applicable for the columnar jointed rock mass.
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2015, Vol. 34 
