CAJ | 학술논문

岩体经历的成岩和构造改造等作用通常使其优势节理组发育，使得工程岩体呈现各向异性特征。本文首先说明当大尺度工程岩体含断续节理组时，岩桥对各向异性强度特征的影响突出。进而指出在采用遍布节理模型描述含优势随机节理的岩体各向异性时，模型中结构面参数为贯通节理的参数，不能直接采用现场断续节理的测试结果，需要进行大尺度岩体各向异性参数等效。然后，提出基于连续方法 FLAC3D遍布节理的参数变化吻合非连续方法3DEC揭示的宏观岩体各向异性特征的途径，完成由连续方法间接描述非连续节理岩体各向异性力学行为的等效过程。研究表明，在无法应用解析法估算含随机断续节理岩体宏观参数时，数值试验成为了更有效的途径。采用遍布节理模型描述断续节理岩体各向异性强度特征时，节理强度参数值受断续节理与岩桥的综合影响，等效节理参数高于节理真实参数。此外，在进行等效连续过程中，为保证等效贯通节理导致的岩体强度凹陷与断续节理作用的方向一致，遍布节理模型中节理走向取值应与断续节理走向呈( jφ′- jφ)/2夹角。
암체경력적성암화구조개조등작용통상사기우세절리조발육，사득공정암체정현각향이성특정。본문수선설명당대척도공정암체함단속절리조시，암교대각향이성강도특정적영향돌출。진이지출재채용편포절리모형묘술함우세수궤절리적암체각향이성시，모형중결구면삼수위관통절리적삼수，불능직접채용현장단속절리적측시결과，수요진행대척도암체각향이성삼수등효。연후，제출기우련속방법 FLAC3D편포절리적삼수변화문합비련속방법3DEC게시적굉관암체각향이성특정적도경，완성유련속방법간접묘술비련속절리암체각향이성역학행위적등효과정。연구표명，재무법응용해석법고산함수궤단속절리암체굉관삼수시，수치시험성위료경유효적도경。채용편포절리모형묘술단속절리암체각향이성강도특정시，절리강도삼수치수단속절리여암교적종합영향，등효절리삼수고우절리진실삼수。차외，재진행등효련속과정중，위보증등효관통절리도치적암체강도요함여단속절리작용적방향일치，편포절리모형중절리주향취치응여단속절리주향정( jφ′- jφ)/2협각。
Preferred discontinuity derived from diagenesis and tectonics reworking always results in the anisotropic characteristics of engineering rock mass. Large-scale engineering rock masses with intermittent joints set have anisotropic strength characteristic,which is influenced by the rock bridge either. So the test results of intermittent joints can not be directly used for ubiquitous joint model,while the equivalent continuum persistent joint parameters should be adopted. When the macroscopic anisotropy simulated by FLAC3D ubiquitous joint model coincides by 3DEC model,the equivalent continuum persistent joint parameters can be defined by inversion analysis. Then,indirectly equivalent continuum method has equal function with discontinuum method in describing anisotropic mechanical behavior of rock mass. In summary,numerical experiment has become a more effective way than analytical method to estimate the macroscopic parameters with random intermittent jointed rock mass. Result shows that the equivalent strength of the equivalent continuum persistent joint parameters by the combined effects of intermittent joints and the rock bridge is higher than that of the real intermittent joints. In addition,in order to keep the definition of the set of directions where the strength of the equivalent discontinuities is equal to the strength of the intermittent discontinuities containing rock bridges,the most likely apparent dip direction of the ubiquitous joint model should have ( j jφ′?φ)/2 separation angle with the real dip direction of the intermittent joints.