%0 Journal Article
%T CONSTITUTIVE RELATIONSHIP AND FAILURE CRITERION FOR BOLTED ORTHOTROPIC ROCKMASS<br>锚固正交各向异性岩体的本构关系和破坏准则
%A Zhang Yujun
%A Liu Yiping
%A <br>张玉军
%A 刘谊平
%J 力学学报
%D 2002
%I 
%X According to the concept of equivalent material-the material that exhibits naturesof uniformity and singleness in macro sense , the constitutive relationship of the material is the same as that of the material that exhibits meso-nonuniformity and contains various compositions. Some researchers have performed many studies on the mechanical properties of the rockmass anchored with systematic bolts such as deformability and strength through model simulation and obtained both theoretical and empirical relation equations between the mechanical indexes and the bolt parameters (diameter, length, spacing for example) of the bolted rockmass. Unfortunately, theirstudies neglect an important nature of the bolting support-quite strong directivity becausethe bolted rockmass under their consideration are almost treated as an isotropic body. In fact, no rockmass, if bolted, will exhibit isotropic changes in its mechanical properties and the most obvious improvement of the properties due to bolting takes place along the bolt axial direction whereas the least takes place in the direction perpendicular to the bolt. Accordingly, the bolted rockmass is a kind of anisotropic body in more strict physical sense, whose characters should be studied thoroughly.Out of this consideration mentioned about, the authors have made attempts to proceed from establishing the theoretical model for the bolted rockmass then to analyze numerically the mechanical behavior of the rockmass. In doing so, firstly consider an orthotropic country rockmass and cut off a representative element containing a bolt in the light of the concept of equivalent material from the mass which has been anchored with systematic bolts, and then deduce and establish the constitutive relationship and the failure criterion of the bolted rockmass by the method in whichthe contributions of the bolt to both stiffness and strength of the country rockmass have been fully taken into account, and afterwards perform numerical computations to analyze the anisotripic behavior of both bolted and non-bolted representative elements in the variations of their stress-strain relation and strength with the installing angle of the bolt. It can been seen from the calculation results for a bolted rockmass, its deformability is constrained due to the increment in its stiffness and strength, i.e., it can bear a higher stress. Finally comparison is made between the theoretical analysis and the result from a simple model simulation in which a tested specimen made from similar materials was compressed uniaxially to failure, showing a good coincidence between them. The mechanical model proposed in the present paper has been proved reliable tentatively. The authors will introduce this model into such numerical analyzing program as FEM code in near future and check it through engineering practice to make it perfect.
%K bolted rockmass
%K orthotropy
%K constitutive equation
%K failure criterion
%K model test<br>锚固岩体
%K 正交各向异性
%K 本构方程
%K 破坏准则
%K 模型试验
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=4100DA4A1A3BA1B0CE5AD99AE1DFB420&aid=CBA61559BD8944AD&yid=C3ACC247184A22C1&vid=339D79302DF62549&iid=94C357A881DFC066&sid=525CF7714FCB18E2&eid=C79A3F06E2AC5B9E&journal_id=0459-1879&journal_name=力学学报&referenced_num=8&reference_num=9